LTC6910-1/ LTC6910-2/LTC6910-3 Digitally Controlled Programmable Gain Amplifiers in SOT-23 FeaTures DescripTion n 3-Bit Digital Gain Control in Three Gain-Code The LTC®6910 family are low noise digitally program- Options mable gain amplifiers (PGAs) that are easy to use and n Rail-to-Rail Input Range occupy very little PC board space. The inverting gain is n Rail-to-Rail Output Swing adjustable using a 3-bit digital input to select gains of 0, n Single or Dual Supply: 2.7V to 10.5V Total 1, 2, 5, 10, 20, 50 and 100V/V in the LTC6910-1; 0, 1, 2, n 11MHz Gain Bandwidth Product 4, 8, 16, 32 and 64V/V in the LTC6910-2; and 0, 1, 2, 3, n Input Noise Down to 8nV/√Hz 4, 5,6 and 7V/V in the LTC6910-3. n System Dynamic Range to 120dB The LTC6910-Xs are inverting amplifiers with rail-to-rail n Input Offset Voltage: 1.5mV output. When operated with unity gain, they will also n 8-Pin Low Profile (1mm) SOT-23 process rail-to-rail input signals. A half-supply refer- (ThinSOT™) Package ence generated internally at the AGND pin supports single power supply applications. Operating from single or split applicaTions supplies from 2.7V to 10.5V, the LTC6910-X family is offered in an 8-lead SOT-23 package. n Data Acquisition Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Dynamic Gain Changing ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their n Automatic Ranging Circuits respective owners. Protected by U.S. patents, including 6121908. n Automatic Gain Control Typical applicaTion Single Supply Programmable Amplifier Frequency Response (LTC6910-1) V+ 50 2.7V TO 10.5V VS = 10V, VIN = 5mVRMS GAIN OF 100 (DIGITAL INPUT 111) 0.1µF 40 DIGITAL INPUTS GAIN IN VOLTS/VOLT G2 G1 G0 6910-1 6910-2 6910-3 0 0 0 0 0 0 8 30 GAIN OF 50 (DIGITAL INPUT 110) 0 0 1 –1 –1 –1 4 B) 001 110 010 –––1250 –––482 –––342 VIN 3 LTC6910-X5 21 VOUT = GAIN • VIN GAIN (d 20 GGGAAAIIINNN OOOFFF 512 00( D((DDIGIIGGITIIATTAAL LLI NIINNPPPUUUT TT0 111100)01)) 1 0 1 –20 –16 –5 6 AGND 10 1 1 0 –50 –32 –6 7 1µF OR LARGER 1 1 1 –100 –64 –7 GAIN OF 2 (DIGITAL INPUT 010) G2 G1 G0 6910 TA01 0 GAIN OF 1 (DIGITAL INPUT 001) PIN 2 (AGND) PROVIDES BUILT-IN HALF-SUPPLY REFERENCE WITH INTERNAL RESISTANCE OF 5k. –10 AGND CAN ALSO BE DRIVEN BY A SYSTEM ANALOG 100 1k 10k 100k 1M 10M GROUND REFERENCE NEAR HALF SUPPLY FREQUENCY (Hz) 6910 TA01b 6910123fb 1 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 absoluTe MaxiMuM raTings pin conFiguraTion (Note 1) Total Supply Voltage (V+ to V–) ............................... 11V Input Current ...................................................... ±25mA TOP VIEW Operating Temperature Range (Note 2) OUT 1 8 V+ LTC6910-1C, -2C, -3C ..........................–40°C to 85°C AGND 2 7 G2 LTC6910-1I, -2I, -3I .............................–40°C to 85°C IN 3 6 G1 V– 4 5 G0 LTC6910-1H, -2H, -3H ...................... –40°C to 125°C TS8 PACKAGE Specified Temperature Range (Note 3) 8-LEAD PLASTIC TSOT-23 LTC6910-1C, -2C, -3C ..........................–40°C to 85°C TJMAX = 150°C, θJA = 230°C/W LTC6910-1I, -2I, -3I .............................–40°C to 85°C LTC6910-1H, -2H, -3H ...................... –40°C to 125°C Storage Temperature Range ...................–65°C to 150°C Lead Temperature (Soldering, 10 sec) ..................300°C orDer inForMaTion http://www.linear.com/product/LTC6910#orderinfo LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC6910-1CTS8#PBF LTC6910-1CTS8#TRPBF LTB5 (6910-1) 8-Lead Plastic TSOT-23 –40°C to 85°C LTC6910-1ITS8#PBF LTC6910-1ITS8#TRPBF LTB5 (6910-1) 8-Lead Plastic TSOT-23 –40°C to 85°C LTC6910-1HTS8#PBF LTC6910-1HTS8#TRPBF LTB5 (6910-1) 8-Lead Plastic TSOT-23 –40°C to 125°C LTC6910-2CTS8#PBF LTC6910-2CTS8#TRPBF LTACQ (6910-2) 8-Lead Plastic TSOT-23 –40°C to 85°C LTC6910-2ITS8#PBF LTC6910-2ITS8#TRPBF LTACQ (6910-2) 8-Lead Plastic TSOT-23 –40°C to 85°C LTC6910-2HTS8#PBF LTC6910-2HTS8#TRPBF LTACQ (6910-2) 8-Lead Plastic TSOT-23 –40°C to 125°C LTC6910-3CTS8#PBF LTC6910-3CTS8#TRPBF LTACS (6910-3) 8-Lead Plastic TSOT-23 –40°C to 85°C LTC6910-3ITS8#PBF LTC6910-3ITS8#TRPBF LTACS (6910-3) 8-Lead Plastic TSOT-23 –40°C to 85°C LTC6910-3HTS8#PBF LTC6910-3HTS8#TRPBF LTACS (6910-3) 8-Lead Plastic TSOT-23 –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. 6910123fb 2 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 gain seTTings anD properTies Table 1. LTC6910-1 NOMINAL NOMINAL LINEAR INPUT RANGE (V ) NOMINAL VOLTAGE GAIN P-P INPUT Dual 5V Single 5V Single 3V IMPEDANCE G2 G1 G0 Volts/Volt (dB) Supply Supply Supply (kΩ) 0 0 0 0 –120 10 5 3 (Open) 0 0 1 –1 0 10 5 3 10 0 1 0 –2 6 5 2.5 1.5 5 0 1 1 –5 14 2 1 0.6 2 1 0 0 –10 20 1 0.5 0.3 1 1 0 1 –20 26 0.5 0.25 0.15 1 1 1 0 –50 34 0.2 0.1 0.06 1 1 1 1 –100 40 0.1 0.05 0.03 1 Table 2. LTC6910-2 NOMINAL NOMINAL LINEAR INPUT RANGE (V ) NOMINAL VOLTAGE GAIN P-P INPUT Dual 5V Single 5V Single 3V IMPEDANCE G2 G1 G0 Volts/Volt (dB) Supply Supply Supply (kΩ) 0 0 0 0 –120 10 5 3 (Open) 0 0 1 –1 0 10 5 3 10 0 1 0 –2 6 5 2.5 1.5 5 0 1 1 –4 12 2.5 1.25 0.75 2.5 1 0 0 –8 18.1 1.25 0.625 0.375 1.25 1 0 1 –16 24.1 0.625 0.313 0.188 1.25 1 1 0 –32 30.1 0.313 0.156 0.094 1.25 1 1 1 –64 36.1 0.156 0.078 0.047 1.25 6910123fb 3 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 gain seTTings anD properTies Table 3. LTC6910-3 NOMINAL NOMINAL LINEAR INPUT RANGE (V ) NOMINAL VOLTAGE GAIN P-P INPUT Dual 5V Single 5V Single 3V IMPEDANCE G2 G1 G0 Volts/Volt (dB) Supply Supply Supply (kΩ) 0 0 0 0 –120 10 5 3 (Open) 0 0 1 –1 0 10 5 3 10 0 1 0 –2 6 5 2.5 1.5 5 0 1 1 –3 9.5 3.33 1.67 1 3.3 1 0 0 –4 12 2.5 1.25 0.75 2.5 1 0 1 –5 14 2 1 0.6 2 1 1 0 –6 15.6 1.67 0.83 0.5 1.7 1 1 1 –7 16.9 1.43 0.71 0.43 1.4 6910123fb 4 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), R = 10k A S L to mid-supply point, unless otherwise noted. C, I SUFFIXES H SUFFIX PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT Specifications for the LTC6910-1, LTC6910-2, LTC6910-3 Total Supply Voltage ● 2.7 10.5 2.7 10.5 V Supply Current V = 2.7V, V = 1.35V ● 2 3 2 3 mA S IN V = 5V, V = 2.5V ● 2.4 3.5 2.4 3.5 mA S IN V = ±5V, V = 0V, Pins 5, 6, 7 = –5V or 5V ● 3 4.5 3 4.5 mA S IN V = ±5V, V = 0V, Pin 5 = 4.5V, ● 3.5 4.9 3.5 4.9 mA S IN Pins 6, 7 = 0.5V (Note 4) Output Voltage Swing LOW (Note 5) V = 2.7V, R = 10k to Mid-Supply Point ● 12 30 12 30 mV S L V = 2.7V, R = 500Ω to Mid-Supply Point ● 50 100 50 100 mV S L V = 5V, R = 10k to Mid-Supply Point ● 20 40 20 40 mV S L V = 5V, R = 500Ω to Mid-Supply Point ● 90 160 90 160 mV S L V = ±5V, R = 10k to 0V ● 30 50 30 50 mV S L V = ±5V, R = 500Ω to 0V ● 180 250 180 270 mV S L Output Voltage Swing HIGH (Note 5) V = 2.7V, R = 10k to Mid-Supply Point ● 10 20 10 20 mV S L V = 2.7V, R = 500Ω to Mid-Supply Point ● 50 80 50 85 mV S L V = 5V, R = 10k to Mid-Supply Point ● 10 30 10 30 mV S L V = 5V, R = 500Ω to Mid-Supply Point ● 80 150 80 150 mV S L V = ±5V, R = 10k to 0V ● 20 40 20 40 mV S L V = ±5V, R = 500Ω to 0V ● 180 250 180 250 mV S L Output Short-Circuit Current (Note 6) V = 2.7V ±27 ±27 mA S V = ±5V ±35 ±35 mA S AGND Open-Circuit Voltage V = 5V ● 2.45 2.5 2.55 2.45 2.5 2.55 V S AGND Rejection (i.e., Common Mode V = 2.7V, V = 1.1V to Upper AGND Limit ● 55 80 50 80 dB S AGND Rejection or CMRR) V = ±5V, V = –2.5V to 2.5V ● 55 75 50 75 dB S AGND Power Supply Rejection Ratio (PSRR) V = 2.7V to ±5V ● 60 80 60 80 dB S Signal Attenuation at Gain = 0 Setting Gain = 0 (Digital Inputs 000), f = 20kHz ● –122 –122 dB Slew Rate V = 5V, V = 2.8V 12 12 V/µs S OUT P-P V = ±5V, V = 2.8V 16 16 V/µs S OUT P-P Digital Input “High” Voltage V = 2.7V ● 2.43 2.43 V S V = 5V ● 4.5 4.5 V S V = ±5V ● 4.5 4.5 V S Digital Input “Low” Voltage V = 2.7V ● 0.27 0.27 V S V = 5V ● 0.5 0.5 V S V = ±5V ● 0.5 0.5 V S Digital Input Leakage Current Magnitude V– ≤ (Digital Input) ≤ V+ 2 2 µA 6910123fb 5 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), R = 10k A S L to mid-supply point, unless otherwise noted. LTC6910-1C/LTC6910-1I LTC6910-1H PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT Specifications for the LTC6910-1 Only Voltage Gain (Note 7) V = 2.7V, Gain = 1, R = 10k ● –0.05 0 0.07 –0.06 0 0.07 dB S L V = 2.7V, Gain = 1, R = 500Ω ● –0.1 –0.02 0.06 –0.12 –0.02 0.08 dB S L V = 2.7V, Gain = 2, R = 10k ● 5.96 6.02 6.08 5.96 6.02 6.08 dB S L V = 2.7V, Gain = 5, R = 10k ● 13.85 13.95 14.05 13.83 13.95 14.05 dB S L V = 2.7V, Gain = 10, R = 10k ● 19.7 19.9 20.1 19.7 19.9 20.1 dB S L V = 2.7V, Gain = 10, R = 500Ω ● 19.6 19.85 20.1 19.4 19.85 20.1 dB S L V = 2.7V, Gain = 20, R = 10k ● 25.7 25.9 26.1 25.65 25.9 26.1 dB S L V = 2.7V, Gain = 50, R = 10k ● 33.5 33.8 34.1 33.4 33.8 34.1 dB S L V = 2.7V, Gain = 100, R = 10k ● 39 39.6 40.2 38.7 39.6 40.2 dB S L V = 2.7V, Gain = 100, R = 500Ω ● 36.4 38.5 40.1 35.4 38.5 40.1 dB S L V = 5V, Gain = 1, R = 10k ● –0.05 0 0.07 –0.05 0 0.07 dB S L V = 5V, Gain = 1, R = 500Ω ● –0.1 –0.01 0.08 –0.11 –0.01 0.08 dB S L V = 5V, Gain = 2, R = 10k ● 5.96 6.02 6.08 5.955 6.02 6.08 dB S L V = 5V, Gain = 5, R = 10k ● 13.8 13.95 14.1 13.75 13.95 14.1 dB S L V = 5V, Gain = 10, R = 10k ● 19.8 19.9 20.1 19.75 19.9 20.1 dB S L V = 5V, Gain = 10, R = 500Ω ● 19.6 19.85 20.1 19.45 19.85 20.1 dB S L V = 5V, Gain = 20, R = 10k ● 25.8 25.9 26.1 25.70 25.9 26.1 dB S L V = 5V, Gain = 50, R = 10k ● 33.5 33.8 34.1 33.4 33.8 34.1 dB S L V = 5V, Gain = 100, R = 10k ● 39.3 39.7 40.1 39.1 39.7 40.1 dB S L V = 5V, Gain = 100, R = 500Ω ● 37 38.7 40.1 36 38.7 40.1 dB S L V = ±5V, Gain = 1, R = 10k ● –0.05 0 0.07 –0.05 0 0.07 dB S L V = ±5V, Gain = 1, R = 500Ω ● –0.1 –0.01 0.08 –0.1 –0.01 0.08 dB S L V = ±5V, Gain = 2, R = 10k ● 5.96 6.02 6.08 5.96 6.02 6.08 dB S L V = ±5V, Gain = 5, R = 10k ● 13.80 13.95 14.1 13.80 13.95 14.1 dB S L V = ±5V, Gain = 10, R = 10k ● 19.8 19.9 20.1 19.75 19.9 20.1 dB S L V = ±5V, Gain = 10, R = 500Ω ● 19.7 19.9 20.1 19.6 19.9 20.1 dB S L V = ±5V, Gain = 20, R = 10k ● 25.8 25.95 26.1 25.75 25.95 26.1 dB S L V = ±5V, Gain = 50, R = 10k ● 33.7 33.85 34 33.6 33.85 34 dB S L V = ±5V, Gain = 100, R = 10k ● 39.4 39.8 40.2 39.25 39.8 40.2 dB S L V = ±5V, Gain = 100, R = 500Ω ● 37.8 39.1 40.1 37 39.1 40.1 dB S L Offset Voltage Magnitude (Internal Op Amp) ● 1.5 9 1.5 11 mV (V ) (Note 8) OS(OA) Offset Voltage Drift (Internal Op Amp) (Note 8) 6 8 µV/°C Offset Voltage Magnitude Gain = 1 ● 3 15 3 18 mV (Referred to “IN” Pin) (V ) Gain = 10 ● 1.7 10 1.7 12 mV OS(IN) DC Input Resistance (Note 9) DC V = 0V IN Gain = 0 >100 >100 MΩ Gain = 1 ● 10 10 kΩ Gain = 2 ● 5 5 kΩ Gain = 5 ● 2 2 kΩ Gain = 10, 20, 50, 100 ● 1 1 kΩ 6910123fb 6 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), R = 10k A S L to mid-supply point, unless otherwise noted. LTC6910-1C/LTC6910-1I LTC6910-1H PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT Specifications for LTC6910-1 Only DC Small-Signal Output Resistance Gain = 0 0.4 0.4 Ω Gain = 1 0.7 0.7 Ω Gain = 2 1 1 Ω Gain = 5 1.9 1.9 Ω Gain = 10 3.4 3.4 Ω Gain = 20 6.4 6.4 Ω Gain = 50 15 15 Ω Gain = 100 30 30 Ω Gain-Bandwidth Product Gain = 100, f = 200kHz 8 11 14 8 11 14 MHz IN ● 6 11 16 5 11 16 MHz Wideband Noise (Referred to Input) f = 1kHz to 200kHz Gain = 0 Output Noise 3.8 3.8 µV RMS Gain = 1 10.7 10.7 µV RMS Gain = 2 7.3 7.3 µV RMS Gain = 5 5.2 5.2 µV RMS Gain = 10 4.5 4.5 µV RMS Gain = 20 4.2 4.2 µV RMS Gain = 50 3.9 3.9 µV RMS Gain = 100 3.4 3.4 µV RMS Voltage Noise Density (Referred to Input) f = 50kHz Gain = 1 24 24 nV/√Hz Gain = 2 16 16 nV/√Hz Gain = 5 12 12 nV/√Hz Gain = 10 10 10 nV/√Hz Gain = 20 9.4 9.4 nV/√Hz Gain = 50 8.7 8.7 nV/√Hz Gain = 100 7.6 7.6 nV/√Hz Total Harmonic Distortion Gain = 10, f = 10kHz, V = 1V –90 –90 dB IN OUT RMS 0.003 0.003 % Gain = 10, f = 100kHz, V = 1V –77 –77 dB IN OUT RMS 0.014 0.014 % AGND (Common Mode) Input Voltage Range V = 2.7V ● 0.55 1.6 0.7 1.5 V S (Note 10) V = 5V ● 0.7 3.65 1 3.25 V S V = ±5V ● –4.3 3.5 –4.3 3.35 V S 6910123fb 7 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), R = 10k A S L to mid-supply point, unless otherwise noted. LTC6910-2C/LTC6910-2I LTC6910-2H PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT Specifications for LTC6910-2 Only Voltage Gain (Note 7) V = 2.7V, Gain = 1, R = 10k l –0.06 0 0.08 –0.07 0 0.08 dB S L V = 2.7V, Gain = 1, R = 500Ω l –0.1 –0.02 0.06 –0.11 –0.02 0.06 dB S L V = 2.7V, Gain = 2, R = 10k l 5.96 6.02 6.1 5.95 6.02 6.1 dB S L V = 2.7V, Gain = 4, R = 10k l 11.9 12.02 12.12 11.9 12.02 12.12 dB S L V = 2.7V, Gain = 8, R = 10k l 17.8 17.98 18.15 17.8 17.98 18.15 dB S L V = 2.7V, Gain = 8, R = 500Ω l 17.65 17.95 18.15 17.55 17.95 18.15 dB S L V = 2.7V, Gain = 16, R = 10k l 23.75 24 24.2 23.75 24 24.2 dB S L V = 2.7V, Gain = 32, R = 10k l 29.7 30 30.2 29.65 30 30.2 dB S L V = 2.7V, Gain = 64, R = 10k l 35.3 35.75 36.2 35.2 35.75 36.2 dB S L V = 2.7V, Gain = 64, R = 500Ω l 33.2 34.8 36.2 32.7 34.8 36.2 dB S L V = 5V, Gain = 1, R = 10k l –0.06 0 0.08 –0.06 0 0.08 dB S L V = 5V, Gain = 1, R = 500Ω l –0.1 –0.01 0.08 –0.11 –0.01 0.08 dB S L V = 5V, Gain = 2, R = 10k l 5.96 6.02 6.1 5.96 6.02 6.1 dB S L V = 5V, Gain = 4, R = 10k l 11.85 12.02 12.15 11.85 12.02 12.15 dB S L V = 5V, Gain = 8, R = 10k l 17.85 18 18.15 17.85 18 18.15 dB S L V = 5V, Gain = 8, R = 500Ω l 17.65 17.9 18.15 17.6 17.9 18.15 dB S L V = 5V, Gain = 16, R = 10k l 23.85 24 24.15 23.78 24 24.15 dB S L V = 5V, Gain = 32, R = 10k l 29.7 30 30.2 29.7 30 30.2 dB S L V = 5V, Gain = 64, R = 10k l 35.6 35.9 36.2 35.5 35.9 36.2 dB S L V = 5V, Gain = 64, R = 500Ω l 33.8 35 36 33.2 35 36 dB S L V = ±5V, Gain = 1, R = 10k l –0.05 0 0.07 –0.05 0 0.07 dB S L V = ±5V, Gain = 1, R = 500Ω l –0.1 –0.01 0.08 –0.1 –0.01 0.08 dB S L V = ±5V, Gain = 2, R = 10k l 5.96 6.02 6.1 5.96 6.02 6.1 dB S L V = ±5V, Gain = 4, R = 10k l 11.9 12.02 12.15 11.9 12.02 12.15 dB S L V = ±5V, Gain = 8, R = 10k l 17.85 18 18.15 17.85 18 18.15 dB S L V = ±5V, Gain = 8, R = 500Ω l 17.80 17.95 18.1 17.72 17.95 18.1 dB S L V = ±5V, Gain = 16, R = 10k l 23.85 24 24.15 23.8 24 24.15 dB S L V = ±5V, Gain = 32, R = 10k l 29.85 30 30.15 29.78 30 30.15 dB S L V = ±5V, Gain = 64, R = 10k l 35.7 35.95 36.2 35.7 35.95 36.2 dB S L V = ±5V, Gain = 64, R = 500Ω l 34.2 35.3 36.2 33.8 35.3 36.2 dB S L Offset Voltage Magnitude (Internal Op Amp) l 1.5 9 1.5 11 mV (V ) (Note 8) OS(OA) Offset Voltage Drift (Internal Op Amp) (Note 8) l 6 8 µV/°C Offset Voltage Magnitude Gain = 1 l 3 15 3 17 mV (Referred to “IN” Pin) (V ) Gain = 8 l 2 10 2 12 mV OS(IN) DC Input Resistance (Note 9) DC V = 0V IN Gain = 0 >100 >100 MΩ Gain = 1 l 10 10 kΩ Gain = 2 l 5 5 kΩ Gain = 4 l 2.5 2.5 kΩ Gain = 8, 16, 32, 64 l 1.25 1.25 kΩ 6910123fb 8 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), R = 10k A S L to mid-supply point, unless otherwise noted. LTC6910-2C/LTC6910-2I LTC6910-2H PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT Specifications for LTC6910-2 Only DC Small-Signal Output Resistance Gain = 0 0.4 0.4 Ω Gain = 1 0.7 0.7 Ω Gain = 2 1 1 Ω Gain = 4 1.6 1.6 Ω Gain = 8 2.8 2.8 Ω Gain = 16 5 5 Ω Gain = 32 10 10 Ω Gain = 64 20 20 Ω Gain-Bandwidth Product Gain = 64, f = 200kHz 9 13 16 9 13 16 MHz IN l 7 13 19 7 13 19 MHz Wideband Noise (Referred to Input) f = 1kHz to 200kHz Gain = 0 Output Noise 3.8 3.8 µV RMS Gain = 1 10.7 10.7 µV RMS Gain = 2 7.3 7.3 µV RMS Gain = 4 5.3 5.3 µV RMS Gain = 8 4.6 4.6 µV RMS Gain = 16 4.2 4.2 µV RMS Gain = 32 4 4 µV RMS Gain = 64 3.6 3.6 µV RMS Voltage Noise Density (Referred to Input) f = 50kHz Gain = 1 24 24 nV/√Hz Gain = 2 16 16 nV/√Hz Gain = 4 12 12 nV/√Hz Gain = 8 10.3 10.3 nV/√Hz Gain = 16 9.4 9.4 nV/√Hz Gain = 32 9 9 nV/√Hz Gain = 64 8.1 8.1 nV/√Hz Total Harmonic Distortion Gain = 8, f = 10kHz, V = 1V –90 –90 dB IN OUT RMS 0.003 0.003 % Gain = 8, f = 100kHz, V = 1V –77 –77 dB IN OUT RMS 0.014 0.014 % AGND (Common Mode) Input Voltage Range V = 2.7V l 0.85 1.55 0.85 1.55 V S (Note 10) V = 5V l 0.7 3.6 0.7 3.6 V S V = ±5V l –4.3 3.4 –4.3 3.4 V S 6910123fb 9 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), R = 10k A S L to mid-supply point, unless otherwise noted. LTC6910-3C/LTC6910-3I LTC6910-2H PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT Specifications for LTC6910-3 Only Voltage Gain (Note 7) V = 2.7V, Gain = 1, R = 10k l –0.05 0 0.07 –0.05 0 0.09 dB S L V = 2.7V, Gain = 1, R = 500Ω l –0.1 –0.02 0.06 –0.11 –0.02 0.06 dB S L V = 2.7V, Gain = 2, R = 10k l 5.93 6.02 6.08 5.93 6.02 6.09 dB S L V = 2.7V, Gain = 3, R = 10k l 9.35 9.5 9.7 9.35 9.5 9.75 dB S L V = 2.7V, Gain = 4, R = 10k l 11.9 11.98 12.2 11.9 11.98 12.2 dB S L V = 2.7V, Gain = 4, R = 500Ω l 11.8 11.98 12.2 11.75 11.98 12.2 dB S L V = 2.7V, Gain = 5, R = 10k l 13.85 13.92 14.05 13.8 13.92 14.05 dB S L V = 2.7V, Gain = 6, R = 10k l 15.4 15.5 15.6 15.4 15.5 15.6 dB S L V = 2.7V, Gain = 7, R = 10k l 16.7 16.85 17 16.7 16.85 17 dB S L V = 2.7V, Gain = 7, R = 500Ω l 16.55 16.8 17 16.47 16.8 17 dB S L V = 5V, Gain = 1, R = 10k l –0.05 0 0.07 –0.05 0 0.07 dB S L V = 5V, Gain = 1, R = 500Ω l –0.1 –0.01 0.08 –0.1 –0.01 0.08 dB S L V = 5V, Gain = 2, R = 10k l 5.96 6.02 6.08 5.96 6.02 6.08 dB S L V = 5V, Gain = 3, R = 10k l 9.45 9.54 9.65 9.45 9.54 9.65 dB S L V = 5V, Gain = 4, R = 10k l 11.85 12.02 12.15 11.85 12.02 12.15 dB S L V = 5V, Gain = 4, R = 500Ω l 11.8 11.95 12.15 11.75 11.95 12.15 dB S L V = 5V, Gain = 5, R = 10k l 13.8 13.95 14.05 13.8 13.95 14.05 dB S L V = 5V, Gain = 6, R = 10k l 15.35 15.5 15.65 15.35 15.5 15.65 dB S L V = 5V, Gain = 7, R = 10k l 16.7 16.85 17 16.7 16.85 17 dB S L V = 5V, Gain = 7, R = 500Ω l 16.6 16.8 17 16.5 16.8 17 dB S L V = ±5V, Gain = 1, R = 10k l –0.06 0 0.07 –0.06 0 0.07 dB S L V = ±5V, Gain = 1, R = 500Ω l –0.1 –0.01 0.08 –0.12 –0.01 0.08 dB S L V = ±5V, Gain = 2, R = 10k l 5.96 6.02 6.08 5.96 6.02 6.08 dB S L V = ±5V, Gain = 3, R = 10k l 9.4 9.54 9.65 9.4 9.54 9.65 dB S L V = ±5V, Gain = 4, R = 10k l 11.85 12 12.2 11.85 12 12.2 dB S L V = ±5V, Gain = 4, R = 500Ω l 11.8 12 12.2 11.8 12 12.2 dB S L V = ±5V, Gain = 5, R = 10k l 13.8 13.95 14.1 13.8 13.95 14.1 dB S L V = ±5V, Gain = 6, R = 10k l 15.35 15.5 15.7 15.35 15.5 15.7 dB S L V = ±5V, Gain = 7, R = 10k l 16.7 16.85 17.05 16.7 16.85 17.05 dB S L V = ±5V, Gain = 7, R = 500Ω l 16.65 16.8 17 16.6 16.8 17 dB S L Offset Voltage Magnitude (Internal Op Amp) l 1.5 8 1.5 8 mV (V ) (Note 8) OS(OA) Offset Voltage Drift (Internal Op Amp) (Note 8) l 6 8 µV/°C Offset Voltage Magnitude Gain = 1 l 3 15 3 15 mV (Referred to “IN” Pin) (V ) Gain = 4 l 1.9 10 1.9 10 mV OS(IN) DC Input Resistance (Note 9) DC V = 0V IN Gain = 0 >100 >100 MΩ Gain = 1 l 10 10 kΩ Gain = 2 l 5 5 kΩ Gain = 3 l 3.3 3.3 kΩ Gain = 4 l 2.5 2.5 kΩ Gain = 5 l 2 2 kΩ Gain = 6 l 1.7 1.7 kΩ Gain = 7 l 1.4 1.4 kΩ 6910123fb 10 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 5V, AGND = 2.5V, Gain = 1 (Digital Inputs 001), R = 10k A S L to mid-supply point, unless otherwise noted. LTC6910-3C/LTC6910-3I LTC6910-2H PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNIT Specifications for LTC6910-3 Only DC Small-Signal Output Resistance Gain = 0 0.4 0.4 Ω Gain = 1 0.7 0.7 Ω Gain = 2 1 1 Ω Gain = 3 1.3 1.3 Ω Gain = 4 1.6 1.6 Ω Gain = 5 1.9 1.9 Ω Gain = 6 2.2 2.2 Ω Gain = 7 2.5 2.5 Ω Gain-Bandwidth Product Gain = 7, f = 200kHz l 11 11 MHz IN Wideband Noise (Referred to Input) f = 1kHz to 200kHz Gain = 0 Output Noise 3.8 3.8 µV RMS Gain = 1 10.7 10.7 µV RMS Gain = 2 7.3 7.3 µV RMS Gain = 3 6.1 6.1 µV RMS Gain = 4 5.3 5.3 µV RMS Gain = 5 5.2 5.2 µV RMS Gain = 6 4.9 4.9 µV RMS Gain = 7 4.7 4.7 µV RMS Voltage Noise Density (Referred to Input) f = 50kHz Gain = 1 24 24 nV/√Hz Gain = 2 16 16 nV/√Hz Gain = 3 14 14 nV/√Hz Gain = 4 12 12 nV/√Hz Gain = 5 11.6 11.6 nV/√Hz Gain = 6 11.2 11.2 nV/√Hz Gain = 7 10.5 10.5 nV/√Hz Total Harmonic Distortion Gain = 4, f = 10kHz, V = 1V –90 –90 dB IN OUT RMS 0.003 0.003 % Gain = 4, f = 100kHz, V = 1V –80 –80 dB IN OUT RMS 0.01 0.01 % AGND (Common Mode) Input Voltage Range V = 2.7V l 0.85 1.55 0.85 1.55 V S (Note 10) V = 5V l 0.7 3.6 0.7 3.6 V S V = ±5V l –4.3 3.4 –4.3 3.4 V S Note 1: Absolute Maximum Ratings are those values beyond which the life Note 5: Output voltage swings are measured as differences between the of the device may be impaired. output and the respective supply rail. Note 2: The LTC6910-XC and LTC6910-XI are guaranteed functional over Note 6: Extended operation with output shorted may cause junction the operating temperature range of –40°C to 85°C. The LTC6910-XH are temperature to exceed the 150°C limit and is not recommended. guaranteed functional over the operating temperature range of –40°C to Note 7: Gain is measured with a DC large-signal test using an output 125°C. excursion between approximately 30% and 70% of supply voltage. Note 3: The LTC6910-XC are guaranteed to meet specified performance Note 8: Offset voltage referred to “IN” pin is (1 + 1/G) times offset from 0°C to 70°C. The LTC6910-XC are designed, characterized and voltage of the internal op amp, where G is nominal gain magnitude. See expected to meet specified performance from –40°C to 85°C but are not Applications Information. tested or QA sampled at these temperatures. LTC6910-XI are guaranteed Note 9: Input resistance can vary by approximately ±30% part-to-part at a to meet specified performance from –40°C to 85°C. The LTC6910-XH are given gain setting. guaranteed to meet specified performance from –40°C to 125°C. Note 10: At limits of AGND input range, open-loop gain of internal op Note 4: Operating all three logic inputs at 0.5V causes the supply current amp may be greater than, or as much as 15dB below, its value at nominal to increase typically 0.1mA from this specification. AGND value. 6910123fb 11 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 Typical perForMance characTerisTics (LTC6910-1) LTC6910-1 Gain Shift LTC6910-1 –3dB Bandwidth vs Temperature LTC6910-1 Frequency Response vs Gain Setting 0.2 50 8.0 OVSU T=P ±U2T. 5UVNLOADED GAIN OF 100 VS = ±5V, VIN = 5mVRMS 77..50• V • IVNS = = 5 2m.7VVRMS 40 6.5 • VS = ±5V B) 0.1 GAIN = 100 30 GAIN OF 50 MHz) 56..50• GAIN CHANGE (d 0 GGAAIINN = = 1 10 GAIN (dB) 2100 GGGGAAAAIIIINNNN OOOOFFFF 251200 dB FREQUENCY ( 454332......005505 •• • –0.1 –3 2.0 • 0 GAIN OF 1 11..50 •• • –0.2 –10 0.05 • •• •• –50 0 50 100 150 100 1k 10k 100k 1M 10M 1 10 100 TEMPERATURE (°C) FREQUENCY (Hz) GAIN 6910 G01 6910 G02 6910 G03 LTC6910-1 Output Voltage Swing LTC6910-1 Power Supply LTC6910-1 Noise Density vs Load Current Rejection vs Frequency vs Frequency OUTPUT VOTLAGE SWING (V)(REFERRED TO SUPPLY VOLTAGE)––––++++VVVVVVVVSSSSSSSS –+–+–+–++ 00111122V........55005500S V S = ± 12–225.455°0VC°°CC SOUSRINCKE REJECTION (dB) 289174653000000000 –SUPPLY +SUPPLGVYSA I=N ±=2 1.5V VOLTAGE NOISE DENSITY (nV/√Hz) 11000 TIVNASP ==U 2T±5-2R°.5CEVFERRED GGGAAIANIINN = = =1 10100 –VS 0 1 0.01 0.1 1 10 100 0.1 1 10 100 1000 1 10 100 OUTPUT CURRENT (mA) FREQUENCY (kHz) FREQUENCY (kHz) 6910 G04 6910 G05 6910 G06 LTC6910-1 Distortion with Light LTC6910-1 Distortion with Heavy LTC6910-1 THD + Noise Loading (R = 10k) Loading (R = 500Ω) vs Input Voltage L L TAL) (dB)––3400 VTVHSO UD=T M ±=2E 1.A5VSVRUMRSE (S2 .H8D3V2 PA-PN)D HD3 31 TAL) (dB)––3400 GAIN = 100 31 ––3200 NfVINSO I==S 1E±k 5BHVWz = 22kHz DAMEN –50 0.3 DAMEN –50 GAIN = 10 0.3 AL (dB)––5400 GAIN SETTING = 100 N N N UDE BELOW FU –––867000 GGAAIINN == 1 1000 000...01013THD (%) UDE BELOW FU –––867000 GAIN = 1 000...01013THD (%)D + NOISE)/SIG–––786000 GAIN SETTING = 10 HD (AMPLIT–90 GAIN = 1 0.003 HD (AMPLIT–90 VTVHSO UD=T M ±=2E 1.A5VSVRUMRSE (S2 .H8D3V2 PA-PN)D HD3 0.003 (TH––10900 GAIN SETTING = 1 T–100 0.001 T–100 0.001 –110 0 50 100 150 200 0 50 100 150 200 0.01 0.1 1 10 FREQUENCY (kHz) FREQUENCY (kHz) INPUT VOLTAGE (VP-P) 6910 G07 6910 G08 6910 G09 6910123fb 12 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 Typical perForMance characTerisTics (LTC6910-2) LTC6910-2 Gain Shift LTC6910-2 –3dB Bandwidth vs Temperature LTC6910-2 Frequency Response vs Gain Setting 0.2 50 8.0 VS = ±2.5V VS = ±5V 7.5• VIN = 10mVRMS OUTPUT UNLOADED VIN = 10mVRMS 7.0 • VS = 2.7V 40 GAIN OF 64 6.5 • VS = ±5V B) 0.1 GAIN = 64 30 GAIN OF 32 MHz) 56..50• GAIN CHANGE (d 0 GGAAIINN == 81 GAIN (dB) 1200 GGGGAAAAIIIINNNN OOOOFFFF 14826 dB FREQUENCY ( 454332......005505 •• •• –0.1 0 GAIN OF 1 –3 12..50 •• 1.0 •• 0.5 •• •• –0.2 –10 0 –50 0 50 100 150 100 1k 10k 100k 1M 10M 1 10 100 TEMPERATURE (°C) FREQUENCY (Hz) GAIN 6910 G10 6910 G11 6910 G12 LTC6910-2 Output Voltage Swing LTC6910-2 Power Supply LTC6910-2 Noise Density vs Load Current Rejection vs Frequency vs Frequency +VS VS = ±2.5V 90 +SUPPLY VS = ±2.5V 100 INPUT-REFERRED G (V)LTAGE)++VVSS –– 01..50 12–2545°0C°°CC SOURCE 8700 GAIN = 1 nV/Hz) TVAS == 2±52°.5CV GAIN = 1 OUTPUT VOTLAGE SWIN(REFERRED TO SUPPLY VO––––++VVVVVVSSSSSS ++–+–+ 011122......505500 SINK REJECTION (dB) 214653000000 –SUPPLY VOLTAGE NOISE DENSITY ( 10 GGAAIINN == 864 –VS 0 1 0.01 0.1 1 10 100 0.1 1 10 100 1000 1 10 100 OUTPUT CURRENT (mA) FREQUENCY (kHz) FREQUENCY (kHz) 6910 G13 6910 G14 6910 G15 LTC6910-2 Distortion with Light LTC6910-2 Distortion with Heavy LTC6910-2 THD + Noise Loading (R = 10k) Loading (R = 500Ω) vs Input Voltage L L NDAMENTAL) (dB)–––345000 VTVHSO UD=T M ±=2E 1.A5VSVRUMRSE (S2 .H8D3V2 PA-PN)D HD3 310.3 NDAMENTAL) (dB)–––345000 GGAAIINN == 684 310.3 NAL (dB)––––54320000 GSEATINT ING = 64 UDE BELOW FU –––867000 GAGIANI N= =6 48 000...01013THD (%) UDE BELOW FU –––867000 GAIN = 1 000...01013THD (%) D + NOISE)/SIG–––786000 GSEATINT ING = 8 THD (AMPLIT––19000 GAIN = 1 00..000031 THD (AMPLIT––19000 VTVHSO UD=T M ±=2E 1.A5VSVRUMRSE (S2 .H8D3V2 PA-PN)D HD3 00..000031 (TH–––11019000 NfVINSO I==S 1E±k 5BHVWz = 22kHz GAIN SETTING = 1 0 50 100 150 200 0 50 100 150 200 0.01 0.1 1 10 FREQUENCY (kHz) FREQUENCY (kHz) INPUT VOLTAGE (VP-P) 6910 G16 6910 G17 6910 G18 6910123fb 13 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 Typical perForMance characTerisTics (LTC6910-3) LTC6910-3 Gain Shift LTC6910-3 –3dB Bandwidth vs Temperature LTC6910-3 Frequency Response vs Gain Setting 0.02 20 8.0 OVSU T=P ±U2T. 5UVNLOADED GAIN OF 7 GAIN OF 6 7.0• V • IVNS = = 1 20.m7VVRMS 15 • VS = ±5V B)0.01 GAIN = 7 10 GGAAIINN OOFF 54 MHz) 6.0• GAIN CHANGE (d–0.010 GGAAIINN == 41 GAIN (dB) 05 GGGAAAIIINNN OOOFFF 321 –3dB FREQUENCY ( 4532....0000 •• •• •• •• • • • • –5 VS = ±5V 1.0 VIN = 10mVRMS –0.02 –10 0 –50 0 50 100 150 100 1k 10k 100k 1M 10M 1 2 3 4 5 6 7 8 910 TEMPERATURE (°C) FREQUENCY (Hz) GAIN 6910 G19 6910 G20 6910 G21 LTC6910-3 Output Voltage Swing LTC6910-3 Power Supply LTC6910-3 Noise Density vs Load Current Rejection vs Frequency vs Frequency +VS VS = ±2.5V 90 +SUPPLY VS = ±2.5V 100 INPUT-REFERRED OUTPUT VOTLAGE SWING (V)REFERRED TO SUPPLY VOLTAGE)–––++++VVVVVVVSSSSSSS ––+–+–+ 0111122.......5005500 12–2545°0C°°CC SOUSRINCKE REJECTION (dB) 28746530000000 –SUPPLY GAIN = 1 OLTAGE NOISE DENSITY (nV/√Hz) 10 TVAS == 2±52°.5CV GGGAAAIIINNN === 147 (–VS + 0.5 10 V –VS 0 1 0.01 0.1 1 10 100 0.1 1 10 100 1000 1 10 100 OUTPUT CURRENT (mA) FREQUENCY (kHz) FREQUENCY (kHz) 6910 G22 6910 G23 6910 G24 LTC6910-3 Distortion with Light LTC6910-3 Distortion with Heavy LTC6910-3 THD + Noise Loading (R = 10k) Loading (R = 500Ω) vs Input Voltage L L TAL) (dB)––3400 VTVHSO UD=T M ±=2E 1.A5VSVRUMRSE (S2 .H8D3V2 PA-PN)D HD3 31 TAL) (dB)––3400 31 ––3200 NfVINSO I==S 1E±k 5BHVWz = 22kHz DAMEN –50 0.3 DAMEN –50 GAIN = 7 0.3 AL (dB)––5400 GAIN SETTING = 7 UDE BELOW FUN –––867000 GAIN = 4 GAIGNA =I N7 = 1 000...01013THD (%) UDE BELOW FUN –––867000 GAIN = 4 GAIN = 1 000...01013THD (%) D + NOISE)/SIGN–––786000 GAIN SETTING = 4 T T H THD (AMPLI––19000 00..000031 THD (AMPLI––19000 VTVHSO UD=T M ±=2E 1.A5VSVRUMRSE (S2 .H8D3V2 PA-PN)D HD3 00..000031 (T–––11019000 GAIN SETTING = 1 0 50 100 150 200 0 50 100 150 200 0.01 0.1 1 10 FREQUENCY (kHz) FREQUENCY (kHz) INPUT VOLTAGE (VP-P) 6910 G25 6910 G26 6910 G27 6910123fb 14 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 pin FuncTions OUT (Pin 1): Analog Output. This is the output of an inter- Recommended analog ground plane connection depends nal operational amplifier and swings to near the power on how power is applied to the LTC6910-X (Figures 1, 2, supply rails (V+ and V–) as specified in the Electrical and 3). Single power supply applications typically use V– Characteristics table. The internal op amp remains active for the system signal ground. The analog ground plane at all times, including the zero gain setting (digital input in single-supply applications should therefore tie to V–, 000). As with other amplifier circuits, loading the out- and the AGND pin should be bypassed to this ground put as lightly as possible will minimize signal distortion plane by a high quality capacitor of at least 1µF (Figure 1). and gain error. The Electrical Characteristics table shows The AGND pin then provides an internal analog reference performance at output currents up to 10mA and current voltage at half the supply voltage (with internal resistance limits that occur when the output is shorted to mid-supply of approximately 5kΩ) which is the center of the swing at 2.7V and ±5V supplies. Signal outputs above 10mA are range for both input and output. Dual supply applications possible but current-limiting circuitry will begin to affect with symmetrical supplies (such as ±5V) have a natural amplifier performance at approximately 20mA. Long-term system ground at zero volts, which can drive the analog operation above 20mA output is not recommended. Do ground plane; AGND then connects directly to the ground not exceed maximum junction temperature of 150°C. The plane, making zero volts the input and output reference output will drive capacitive loads up to 50pF. Capacitances voltage for the LTC6910-X (Figure 2). Finally, if a dual higher than 50pF should be isolated by a series resistor power supply is asymmetrical, the supply ground is still to preserve AC stability. the natural ground plane voltage. To maximize signal swing capability with an asymmetrical supply, however, AGND (Pin 2): Analog Ground. The AGND pin is at the it is often desirable to refer the LTC6910-X’s analog input midpoint of an internal resistive voltage divider, develop- and output to a voltage equidistant from the two supply ing a potential halfway between the V+ and V– pins, with rails V+ and V–. The AGND pin will provide such a poten- an equivalent series resistance to the pin of nominally tial when open-circuited and bypassed with a capacitor 5kΩ (Figure 4). AGND is also the noninverting input of the (Figure 3), just as with a single power supply, but now the internal op amp, which makes it the ground reference volt- ground plane connection is different and the LTC6910-X’s age for the IN and OUT pins. Because of this, very “clean” V+ and V– pins are both isolated from this ground plane. grounding is important, including an analog ground plane surrounding the package. V+ V+ V+ 0.1µF 0.1µF 0.1µF 8 7 6 5 8 7 6 5 8 7 6 5 LTC6910-X LTC6910-X LTC6910-X 1 2 3 4 1 2 3 4 1 2 3 4 ANALOG 0.1µF ANALOG MID-SUPPLY 0.1µF ANALOG V+ GROUND GROUND REFERENCE GROUND 2 REFERENCE PLANE PLANE 1µF PLANE 1µF V– V– SINGLE-POINT SINGLE-POINT SINGLE-POINT SYSTEM GROUND DIGITAL GROUND PLANE SYSTEM GROUND DIGITAL GROUND PLANE SYSTEM GROUND DIGITAL GROUND PLANE (IF ANY) (IF ANY) (IF ANY) 6910 F02 6910 F03 6910 F01 Figure 1. Single Supply Figure 2. Symmetrical Dual Supply Figure 3. Asymmetrical Dual Ground Plane Connection Ground Plane Connection Supply Ground Plane Connection 6910123fb 15 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 pin FuncTions Where AGND does not connect to a ground plane, as in input resistance. The input may vary from rail to rail in Figures 1 and 3, it is important to AC-bypass the AGND the “zero” gain setting but the output is insensitive to it pin. This is especially true when AGND is used as a refer- and remains at the AGND potential. Circuitry driving the ence voltage for other circuitry. Also, without a bypass IN pin must consider the LTC6910-X’s input resistance capacitor, wideband noise will enter the signal path from and the variation of this resistance when used at mul- the internal voltage divider resistors that set the DC volt- tiple gain settings. Signal sources with significant output age on AGND. This noise can reduce SNR by 3dB at high resistance may introduce a gain error as the source’s gain settings. The resistors present a Thévenin equivalent output resistance and the LTC6910-X’s input resistance of approximately 5k to the AGND pin. An external capaci- form a voltage divider. This is especially true at the higher tor from AGND to the ground plane, whose impedance gain settings where the input resistance is lowest. is well below 5k at frequencies of interest, will suppress In single supply voltage applications at elevated gain this noise. A 1µF high quality capacitor is effective in sup- settings (digital input 010 or higher), it is important to pressing resistor noise for frequencies down to 1kHz. remember that the LTC6910-X’s DC ground reference for Larger capacitors extend this suppression to propor- both input and output is AGND, not V–. With increasing tionately lower frequencies. This issue does not arise in gains, the LTC6910-X’s input voltage range for unclipped symmetrical dual supply applications (Figure 2) because output is no longer rail-to-rail but shrinks toward AGND. AGND goes directly to ground. The OUT pin also swings positive or negative with respect In applications requiring an analog ground reference to AGND. At unity gain (digital input 001), both IN and other than halfway between the supply rails, the user can OUT voltages can swing from rail to rail (Tables 1, 2, 3). override the built-in analog ground reference by tying the AGND pin to a reference voltage within the AGND voltage G2 G1 G0 range specified in the Electrical Characteristics table. The 7 6 5 AGND pin will load the external reference with approxi- mately 5k returned to the mid-supply potential. AGND CMOS LOGIC should still be capacitively bypassed to a ground plane as noted above. Do not connect the AGND pin to the V– pin. IN (Pin 3): Analog Input. The input signal to the amplifier in the LTC6910-X is the voltage difference between the IN 3 IN and AGND pins. The IN pin connects internally to a digitally controlled resistance whose other end is a cur- INPUT R ARRAY FEEDBACK R ARRAY rent summing point at the same potential as the AGND pin – (Figure 4). At unity gain (digital input 001), the value of this MOS-INPUT 1 OUT input resistance is approximately 10kΩ and the IN volt- OP AMP + age range is rail-to-rail (V+ to V–). At gain settings above unity (digital input 010 or higher), the input resistance 10k 10k falls. Also, the linear input voltage range falls in inverse V+ V– proportion to gain. (The higher gains are designed to 8 2 4 boost lower level signals with good noise performance.) 6910 F04 V+ AGND V– Tables 1, 2, and 3 summarize this behavior. In the “zero” gain state (digital input 000), analog switches disconnect Figure 4. Block Diagram the IN pin internally and this pin presents a very high 6910123fb 16 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 pin FuncTions V–, V+ (Pins 4, 8): Power Supply Pins. The V+ and V– pins These pins control the voltage gain from IN to OUT pins should be bypassed with 0.1µF capacitors to an adequate (see Table 1, Table 2 and Table 3). Digital input code 000 analog ground plane using the shortest possible wiring. causes a “zero” gain with very low output noise. In this Electrically clean supplies and a low impedance ground “zero” gain state the IN pin is disconnected internally, but are important for the high dynamic range available from the OUT pin remains active and forced by the internal op the LTC6910-X (see further details under AGND). Low amp to the voltage present on the AGND pin. Note that the noise linear power supplies are recommended. Switching voltage gain from IN to OUT is inverting: OUT and IN pins power supplies require special care to prevent switching always swing on opposite sides of the AGND potential. noise coupling into the signal path, reducing dynamic The G pins are high impedance CMOS logic inputs and range. must be connected (they will float to unpredictable volt- ages if open circuited). No speed limitation is associated G0, G1, G2 (Pins 5, 6, 7): CMOS-Level Digital Gain- with the digital logic because it is memoryless and much Control Inputs. G2 is the most significant bit (MSB). faster than the analog signal path. 6910123fb 17 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 applicaTions inForMaTion Functional Description moves, with finite speed, toward a differently scaled ver- sion of the input signal. Varying the gain faster than the The LTC6910 family are small outline, wideband inverting output can settle produces a garbled output signal. The DC amplifiers whose voltage gain is digitally program- LTC6910-X analog path settles with a characteristic time mable. Each delivers a choice of eight voltage gains, constant or time scale, τ, that is roughly the standard controlled by the 3-bit digital inputs to the G pins, which value for a first order band limited response: accept CMOS logic levels. The gain code is always mono- tonic; an increase in the 3-bit binary number (G2 G1 G0) τ = 1 / (2 π f ), -3dB causes an increase in the gain. Table 1, Table 2 and Table 3 where f is the –3dB bandwidth of the amplifier. For -3dB list the nominal voltage gains for LTC6910-1, LTC6910-2 example, when the upper –3dB frequency is 1MHz, τ and LTC6910-3 respectively. Gain control within each is about 160ns. The bandwidth, and therefore τ, varies amplifier occurs by switching resistors from a matched with gain (see Frequency Response and –3dB Bandwidth array in or out of a closed-loop op amp circuit using MOS curves in Typical Performance Characteristics). After a analog switches (Figure 4). Bandwidth depends on gain gain change it is the new gain value that determines the setting. Curves in the Typical Performance Characteristics settling time constant. Exact settling timing depends on section show measured frequency responses. the gain change, the input signal and the possibility of slew limiting at the output. However as a basic guideline, Digital Control the range of τ is 20ns to 1400ns for the LTC6910-1, 20ns Logic levels for the LTC6910-X digital gain control inputs to 900ns for the LTC6910-2 and 20ns to 120ns for the (Pins 5, 6, 7) are nominally rail-to-rail CMOS. Logic 1 LTC6910-3. These numbers correspond to the ranges of is V+, logic 0 is V– or alternatively 0V when using ±5V –3dB Bandwidth in the plots of that title under Typical supplies. The part is tested with the values listed in the Performance Characteristics. Electrical Characteristics table (Digital Input “High” and “Low” Voltages), which are 10% and 90% of full excur- Offset Voltage vs Gain Setting sion on the inputs. That is, the tested logic levels are The electrical tables list DC offset (error) voltage at the 0.27V and 2.43V with a 2.7V supply, 0.5V and 4.5V levels inputs of the internal op-amp in Figure 4, V , which with 0V and 5V supply rails, and 0.5V and 4.5V logic levels OS(OA) is the source of DC offsets in the LTC6910-X. The tables at ±5V supplies. Do not attempt to drive the digital inputs also show the resulting, gain dependent offset voltage with TTL logic levels (such as HCT or LS logic), which referred to the IN pin, V . These two measures are normally do not swing near +5V. TTL sources should be OS(IN) related through the feedback/input resistor ratio, which adapted with CMOS drivers or suitable pull-up resistors equals the nominal gain-magnitude setting, G: to 5V so that they will swing to the positive rail. V = (1 + 1/G) V OS(IN) OS(OA) Timing Constraints Offset voltages at any gain setting can be inferred from Settling time in the CMOS gain-control logic is typically this relationship. For example, an internal offset V OS(OA) several nanoseconds and faster than the analog signal of 1mV will appear referred to the IN pin as 2mV at a gain path. When amplifier gain changes, the limiting timing setting G of 1, or 1.5mV at a gain setting of 2. At high is analog, not digital, because the effects of digital input gains, V approaches V . (Offset voltage can OS(IN) OS(OA) changes are observed only through the analog output be of either polarity; it is a statistical parameter centered (Figure 4). The LTC6910-X’s logic is static (not latched) on zero.) The MOS input circuitry of the internal op amp and therefore lacks bus timing requirements. However, as in Figure 4 draws negligible input currents (unlike some with any programmable-gain amplifier, each gain change op amps), so only V and G affect the overall ampli- OS(OA) causes an output transient as the amplifier’s output fier’s offset. 6910123fb 18 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 applicaTions inForMaTion Offset Nulling and Drift tightly matched, these internal 10k resistors also have an absolute tolerance of up to ±30% and a temperature Because internal op amp offset voltage V is gain OS(OA) coefficient of typically –30ppm/°C.) Also, as described independent as noted above, offset trimming can be read- under Pin Functions for AGND, a bypass capacitor C1 is ily added at the AGND pin, which drives the noninvert- always advisable when AGND is not connected directly ing input of the internal op amp. Such a trim shifts the to a ground plane. AGND voltage slightly from the system’s analog ground reference, where AGND would otherwise connect directly. With this trim technique in place, the remaining DC off- This is convenient when a low resistance analog ground set sources are drifts with temperature (typically 6µV/°C potential or analog ground reference exists, for the return referred to V ), shifts in the LTC6910-X’s supply OS(OA) of a voltage divider as in Figure 5a. When adjusted for voltage divided by the PSRR factors, supply voltage zero DC output voltage when the LTC6910-X has zero shifts coupling through the two 10k internal resistors of DC input voltage, this DC nulling will hold at other gain Figure 4, and of course any shifts in the reference voltages settings also. that supply +V and –V in Figure 5a. REF REF Figure 5a shows the basic arrangement for dual-supply Figure 5b illustrates how to make an offset voltage adjust- applications. A voltage divider (R1 and R2) scales external ment relative to the mid-supply potential in single supply reference voltages +V and –V to a range equaling applications. Resistor values shown provide at least a REF REF or slightly exceeding the approximately ±10mV op amp ±10mV adjustment range assuming the minimum values offset-voltage range. Resistor R1 is chosen to drop the for the internal resistors at pin 2 and a supply potential ±10mV maximum trim voltage when the potentiometer of 5V. For single supply systems where all circuitry is DC is set to either end. Thus if V is 5V, R1 should be referenced to some other fixed bias potential, an offset REF about 100Ω. Note also that the two internal 10k resistors adjustment scheme is shown in Figure 5c. A low value in Figure 4 tend to bias AGND toward the mid-point of for R1 overrides the internal resistors at pin 2 and applies V+ and V–. The external voltage divider will swamp this the system DC bias to the LTC6910. Actual values for effect if R1 is much less than 5kΩ. When considering the the adjustment components depend on the magnitude of effect of the internal 10k resistors, note that they form a the DC bias voltage. Offset adjustment component values Thévenin equivalent of 5k in series with an open-circuit shown are an example with a single 5V V supply and a CC voltage at the halfway potential (V+ + V–)/ 2. (Although 1.25V system DC reference voltage. 1.25V VCC 5V SYSTEM DC REFERENCE VOLTAGE VCC 5V 8 VCC 5V 8 +VREF LTC6910-X 17.4k LTC6910-X 4.64k R1 LTC6910-X R2 100Ω 49.9k 2 2 2 20k AGND 500Ω AGND 500Ω AGND 1µF 1µF R1 C1 ≥1µF 17.4k 976Ω –VREF 6910 F05a 4 6910 F05b 4 6910 F05c ANALOG GROUND REFERENCE Figure 5a. Offset Nulling Figure 5b. Offset Nulling Figure 5c. Offset Nulling (Dual Supplies) (Single Supply, Half Supply Reference) (Single Supply, External Reference) 6910123fb 19 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 applicaTions inForMaTion Analog Input and DC Levels Note that operating the LTC6910-X in zero gain mode (dig- ital inputs 000) open circuits the IN pin and this demands As described in Tables 1, 2 and 3 and under Pin Functions, some care if employed with a series input capacitor. When the IN pin presents a variable input resistance returned the chip enters the zero gain mode, the opened IN pin internally to a potential equal to that at the AGND pin tends to freeze the voltage across the capacitor to the (within a small offset-voltage error). This input resistance value it held just before the zero gain state. This can place varies with digital gain setting, becoming infinite (open the IN pin at or near the DC potential of a supply rail circuit) at “zero” gain (digital input 000), and as low as (the IN pin may also drift to a supply potential in this 1kΩ at high gain settings. It is important to allow for this state due to small junction leakage currents). To prevent input-resistance variation with gain, when driving driving the IN pin outside the supply limit and potentially the LTC6910-X from other circuitry. Also, as the gain damaging the chip, avoid AC input signals in the zero increases above unity, the DC linear input-voltage range gain state with a series capacitor. Also, switching later to (corresponding to rail-to-rail swing at the OUT pin) shrinks a nonzero gain value will cause a transient pulse at the toward the AGND potential. The output swings positive output of the LTC6910-X (with a time constant set by or negative around the AGND potential (in the opposite the capacitor value and the new LTC6910-X input resis- direction from the input, because the gain is inverting). tance value). This occurs because the IN pin returns to the AGND potential and transient current flows to charge AC-Coupled Operation the capacitor to a new DC drop. Adding a capacitor in series with the IN pin makes the LTC6910-X into an AC-coupled amplifier, suppressing the SNR and Dynamic Range source’s DC level (and even minimizing the offset voltage The term “dynamic range” is much used (and abused) from the LTC6910-X itself). No further components are with signal paths. Signal-to-noise ratio (SNR) is an unam- required because the input of the LTC6910-X biases itself biguous comparison of signal and noise levels, measured correctly when a series capacitor is added. The IN pin in the same way and under the same operating conditions. connects to an internal variable resistor (and floats when In a variable gain amplifier, however, further characteriza- DC open-circuited to a well defined voltage equal to the tion is useful because both noise and maximum signal AGND input voltage at nonzero gain settings). The value level in the amplifier will vary with the gain setting, in of this internal input resistor varies with gain setting over general. In the LTC6910-X, maximum output signal is a total range of about 1k to 10k, depending on version independent of gain (and is near the full power supply (the rightmost columns of Table 1, Table 2 and Table 3). voltage, as detailed in the Swing sections of the Electrical Therefore, with a series input capacitor the low frequency Characteristics table). The maximum input level falls with cutoff will also vary with gain. For example, for a low increasing gain, and the input-referred noise falls as well frequency corner of 1kHz or lower, use a series capacitor (as listed also in the table). To summarize the useful signal of 0.16µF or larger. A 0.16µF capacitor has a reactance range in such an amplifier, we define Dynamic Range (DR) of 1kΩ at 1kHz, giving a 1kHz lower –3dB frequency for as the ratio of maximum input (at unity gain) to mini- gain settings of 10V/V through 100V/V in the LTC6910-1. mum input-referred noise (at maximum gain). (These two If the LTC6910-1 is operated at lower gain settings with numbers are measured commensurately, in RMS Volts. an 0.16µF input capacitor, the higher input resistance will For deterministic signals such as sinusoids, 1V = reduce the lower corner frequency down to 100Hz at a RMS 2.828V .) This DR has a physical interpretation as the gain setting of 1V/V. These frequencies scale inversely P-P range of signal levels that will experience an SNR above with the value of the input capacitor. unity V/V or 0dB. At a 10V total power supply, DR in the 6910123fb 20 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 applicaTions inForMaTion LTC6910-1 (gains 0V to 100V/V) is typically 120dB (the Expanding an ADC’s Dynamic Range ratio of a nominal 9.9V , or 3.5V , maximum input to P-P RMS Figure 6 shows a compact data acquisition system the 3.4µV high gain input noise). The corresponding RMS for wide ranging input levels. This figure combines an DR for the LTC6910-2 (gains 0V to 64V) is also 120dB; LTC6910-X programmable amplifier (8-lead TSOT-23) for the LTC6910-3 (gains 0V to 7V/V) it is 117dB. The with an LTC1864 analog-to-digital converter (ADC) in SNR from an amplifier is the ratio of input level to input- an 8-lead MSOP. This ADC has 16-bit resolution and a referred noise, and can be 110dB with the LTC6910 family maximum sampling rate of 250ksps. An LTC6910-1, for at unity gain. example, expands the ADC’s input amplitude range by 40dB while operating from the same single 5V supply. Construction and Instrumentation Cautions The 499Ω resistor and 270pF capacitor couple cleanly Electrically clean construction is important in applica- between the LTC6910-X’s output and the switched-capac- tions seeking the full dynamic range of the LTC6910-X itor input of the LTC1864. The 270pF capacitor should be amplifier. Short, direct wiring will minimize parasitic an NPO or X7R type, and lead length and inductance in the capacitance and inductance. High quality supply bypass connections to the LTC1864 inputs must be minimized, capacitors of 0.1µF near the chip provide good decou- to achieve the full performance capability of this circuit. pling from a clean, low inductance power source. But (See LTC 1864 data sheet for further general information.) several cm of wire (i.e., a few microhenrys of inductance) At a gain setting of 10V/V in an LTC6910-1 (digital input from the power supplies, unless decoupled by substantial 100) and a 250ksps sampling rate in the LTC1864, a capacitance (≥10µF) near the chip, can cause a high-Q 10kHz input signal at 60% of full scale shows a THD of LC resonance in the hundreds of kHz in the chip’s sup- –87dB at the digital output of the ADC. 100kHz input plies or ground reference. This may impair circuit perfor- signals under the same conditions produce THD values mance at those frequencies. A compact, carefully laid out around –75dB. Noise effects (both random and quantiza- printed circuit board with a good ground plane makes a tion) in the ADC are divided by the gain of the amplifier significant difference in minimizing distortion. Finally, when referred to V in Figure 4. Because of this, the equipment to measure amplifier performance can itself IN circuit can acquire a signal that is 40dB down from full introduce distortion or noise floors. Checking for these scale of 5V with an SNR of over 70dB. Such perfor- limits with a wire replacing the chip is a prudent routine P-P mance from an ADC alone (70 + 40 = 110dB of useful procedure. dynamic range at 250ksps), if available, would be far more expensive. 1µF 5V 0.1µF 5V LTC1864 8 4 VREF VCC VIN 3 LTC6910-X 1 499Ω IN+ SCK 6 5 270pF IN– SDO 7 2 GND CONV AGND 6910 F04 1µF GAIN ADC CONTROL CONTROL Figure 6. Expanding an ADC’s Dynamic Range 6910123fb 21 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 applicaTions inForMaTion Low Noise AC Amplifier with Programmable Gain upper corner frequency. The LT1884 also supports rail- and Bandwidth to-rail output swings over the total supply voltage range of 2.7V to 10.5V. AC coupling through capacitor C1 Analog data acquisition can exploit band limiting as well establishes a fixed low frequency corner of 1Hz, which as gain to suppress unwanted signals or noise. Tailoring can be adjusted by changing C1. Alternatively, shorting an analog front end to both the level and bandwidth of C1 makes the amplifier DC coupled. (If DC gain is not each source maximizes the resulting SNR. needed, however, the AC coupling suppresses several Figure 7 shows a block diagram and Figure 8 the practical error sources: any shifts in DC levels, low frequency circuit for a low noise amplifier with gain and bandwidth noise and all amplifier DC offset voltages other than the independently programmable over 100:1 ranges. One low internally trimmed LT1884 offset in the integrating LTC6910-X controls the gain and another controls the amplifier. If desired, another coupling capacitor in series bandwidth. An LT1884 dual op amp forms an integrating with the input can relax the requirements on DC input lowpass loop with capacitor C2 to set the programmable level as well.) R2 C2 VIN – C1 R1 – + – + – GAIN C(GOANITNR AO)L PGA + VOUT 6910 F05 + BANDWIDTH CONTROL PGA (GAIN B) GAIN = –1 1 1 VOUT = (GAIN A)VIN 2πR1C1 BANDWIDTH R2 2π C2 (GAIN B) Figure 7. Block Diagram of an AC Amplifier with Programmable Gain and Bandwidth 6910123fb 22 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 applicaTions inForMaTion Measured frequency responses in Figure 8 with LT1884 (gain-bandwidth product around 1MHz). Noise LTC6910-1 PGAs demonstrate bandwidth settings of floor from internal sources yields an output SNR of 76dB 10Hz, 100Hz and 1kHz, with digital codes at the BW inputs with 10mV input, gain of 100 and 100Hz bandwidth; P-P of respectively 001, 100 and 111, and unity gain in each for 100mV input, gain of 10 and 1000Hz bandwidth it P-P case. By scaling C2, this circuit can serve other band- is 64dB. widths, such as a maximum of 10kHz with 0.1µF using V+ V– V+ V– VOUT 0.1µF 0.1µF R2 0.1µF 0.1µF 15.8k C2 V+ 1µF 0.1µF 8 C1 1 LT1884 8 8 4 10µF R1 V+ 4 VIN 3 LTC6910-1 1 15.8k 2 – 7 R4 15.8k 3 LTC6910-1 1 6 5 3 + – 6 6 5 2 7 4 V– + 5 15.R83k 2 7 0.1µF GAIN V– BANDWIDTH CONTROL CONTROL GN2 GN1 GN0 BW2 BW1 BW0 0 0 1 GAIN = 1 BANDWIDTH 1Hz TO 10Hz 0 0 1 0 1 0 GAIN = 2 BANDWIDTH 1Hz TO 20Hz 0 1 0 0 1 1 GAIN = 5 BANDWIDTH 1Hz TO 50Hz 0 1 1 1 0 0 GAIN = 10 BANDWIDTH 1Hz TO 100Hz 1 0 0 1 0 1 GAIN = 20 BANDWIDTH 1Hz TO 200Hz 1 0 1 1 1 0 GAIN = 50 BANDWIDTH 1Hz TO 500Hz 1 1 0 1 1 1 GAIN = 100 BANDWIDTH 1Hz TO 1000Hz 1 1 1 Gain vs Frequency 10 GN2 GN1 GN0 = 001 0 BW2BW1BW0 –10 1 1 1 –20 N (dB)–30 BW02BW01BW10 AI–40 G BW2BW1BW0 –50 1 0 0 –60 –70 –80 1 10 100 1k 10k 100k FREQUENCY (Hz) 6910 F06b Figure 8. Low Noise AC Amplifier with Programmable Gain and Bandwidth 6910123fb 23 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 package DescripTion Please refer to http://www.linear.com/product/LTC6910#packaging for the most recent package drawings. TS8 Package 8-LeTaSd8 P Plaasctkica gTeSOT-23 (Refer8e-nLcee aLTdC P DlWasGt i#c 0T5S-0O8T-1-26337 Rev A) (Reference LTC DWG # 05-08-1637 Rev A) 2.90 BSC 0.40 0.65 (NOTE 4) MAX REF 1.22 REF 1.50 – 1.75 3.85 MAX2.62 REF 1.4 MIN 2.80 BSC (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT 0.22 – 0.36 0.65 BSC PER IPC CALCULATOR 8 PLCS (NOTE 3) 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 1.95 BSC 0.09 – 0.20 TS8 TSOT-23 0710 REV A (NOTE 3) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 6910123fb 24 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 revision hisTory (Revision history begins at Rev B) REV DATE DESCRIPTION PAGE NUMBER B 06/17 Updated Voltage Gain Specs 6, 8 6910123fb 25 For more information www.linear.com/LTC6910

LTC6910-1/ LTC6910-2/LTC6910-3 Typical applicaTion AC-Coupled Single Supply Amplifiers V+ 2.7V TO 10.5V 0.1µF LTC6910-1 LTC6910-2 LTC6910-3 DIGITAL INPUTS PASSBAND LOWER –3dB PASSBAND LOWER –3dB PASSBAND LOWER –3dB G2 G1 G0 GAIN FREQ (C1 = 1µF) GAIN FREQ (C1 = 1µF) GAIN FREQ (C1 = 1µF) 8 0 0 0 0 — 0 — 0 — C1 4 0 0 1 –1 16Hz –1 16Hz –1 16Hz 3 1 0 1 0 –2 32Hz –2 32Hz –2 32Hz VIN LTC6910-X VOUT = GAIN • VIN 0 1 1 –5 80Hz –4 64Hz –3 48Hz 2 1 0 0 –10 160Hz –8 127Hz –4 64Hz 5 1 0 1 –20 160Hz –16 127Hz –5 80Hz 6 AGND 7 1µF OR LARGER 1 1 0 –50 160Hz –32 127Hz –6 95Hz 1 1 1 –100 160Hz –64 127Hz –7 111Hz G2 G1 G0 6910 TA02 C1 VALUE SETS LOWER CORNER FREQUENCY. PIN 2 (AGND) SETS DC OUTPUT VOLTAGE AND HAS THE TABLE SHOWS THIS FREQUENCY WITH BUILT-IN HALF-SUPPLY REFERENCE WITH INTERNAL C1 = 1µF. THIS FREQUENCY SCALES INVERSELY RESISTANCE OF 5k. AGND CAN ALSO BE DRIVEN BY A WITH C1 SYSTEM ANALOG GROUND REFERENCE NEAR HALF SUPPLY Frequency Response, LTC6910-1 Frequency Response, LTC6910-2 Frequency Response, LTC6910-3 50 40 20 G2, G1, G0 = 111 G2, G1, G0 = 110 G2, G1, G0 = 111 G2, G1, G0 = 111 40 G2, G1, G0 = 110 15 30 G2, G1, G0 = 110 G2, G1, G0 = 101 G2, G1, G0 = 101 G2, G1, G0 = 100 30 G2, G1, G0 = 101 10 B) B) 20 G2, G1, G0 = 100 B) G2, G1, G0 = 011 N (d 20 G2, G1, G0 = 100 N (d G2, G1, G0 = 011 N (d 5 G2, G1, G0 = 010 AI G2, G1, G0 = 011 AI AI G G 10 G G2, G1, G0 = 010 10 G2, G1, G0 = 010 0 G2, G1, G0 = 001 G2, G1, G0 = 001 G2, G1, G0 = 001 0 0 –5 VS = 10V VS = 10V, VIN = 5mVRMS VS = 10V, VIN = 5mVRMS VIN = 10mVRMS C1 = 1µF C1 = 1µF C1 = 1µF –10 –10 –10 100 1k 10k 100k 1M 100 1k 10k 100k 1M 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 6910 TA03 6910 TA04 6910 TA05 relaTeD parTs PART NUMBER DESCRIPTION COMMENTS LT®1228 100MHz Gain Controlled Transconductance Amplifier Differential Input, Continuous Analog Gain Control LT1251/LT1256 40MHz Video Fader and Gain Controlled Amplifier Two Input, One Output, Continuous Analog Gain Control LTC1564 10kHz to 150kHz Digitally Controlled Filter and PGA Continuous Time, Low Noise 8th Order Filter and 4-Bit PGA LTC6911 Dual Matched Programmable Gain Amplifier Dual 6910 in a 10 Lead MSOP LTC6915 Zero Drift Instrumentation Amplifier with Programmable Gain Zero Drift, Digitally Programmable Gain Up to 4096 V/V 6910123fb 26 LT 0617 REV B • PRINTED IN USA www.linear.com/LTC6910 For more information www.linear.com/LTC6910  LINEAR TECHNOLOGY CORPORATION 2002

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LTC6910-3ITS8#TRPBF LTC6910-2CTS8#PBF LTC6910-1CTS8#TRM LTC6910-2HTS8#TRMPBF LTC6910- 2CTS8 LTC6910-1ITS8#TRM LTC6910-1HTS8#TR LTC6910-2ITS8#TR LTC6910-3HTS8#TRPBF LTC6910- 2ITS8#TRPBF LTC6910-2ITS8 LTC6910-2CTS8#TR LTC6910-1ITS8#TRMPBF LTC6910-3HTS8#TRM LTC6910- 1CTS8#TRMPBF LTC6910-2HTS8#TRPBF LTC6910-3HTS8 LTC6910-3CTS8 LTC6910-1CTS8#PBF LTC6910- 1ITS8 LTC6910-2ITS8#TRM LTC6910-2CTS8#TRPBF LTC6910-3ITS8#PBF LTC6910-3ITS8#TR LTC6910- 3HTS8#TRMPBF LTC6910-1HTS8#TRMPBF LTC6910-1HTS8#TRM LTC6910-2ITS8#TRMPBF LTC6910- 1ITS8#PBF LTC6910-1HTS8 LTC6910-3CTS8#TRMPBF LTC6910-3HTS8#PBF LTC6910-3ITS8#TRM LTC6910- 3CTS8#TR LTC6910-2HTS8#TRM LTC6910-3ITS8 LTC6910-1ITS8#TR LTC6910-1ITS8#TRPBF LTC6910- 2HTS8#TR LTC6910-2CTS8#TRMPBF LTC6910-1CTS8#TRPBF LTC6910-2HTS8#PBF LTC6910-2ITS8#PBF LTC6910-1HTS8#PBF LTC6910-1HTS8#TRPBF LTC6910-3CTS8#TRPBF LTC6910-3CTS8#TRM LTC6910- 3HTS8#TR LTC6910-2HTS8 LTC6910-2CTS8#TRM LTC6910-3CTS8#PBF LTC6910-3ITS8#TRMPBF LTC6910- 1CTS8 LTC6910-1CTS8#TR