LT1800 80MHz, 25V/µs Low Power Rail-to-Rail Input and Output Precision Op Amp FEATURES DESCRIPTION n Gain Bandwidth Product: 80MHz The LT®1800 is a low power, high speed rail-to-rail input and n Input Common Mode Range Includes Both Rails output operational amplifi er with excellent DC performance. n Output Swings Rail-to-Rail The LT1800 features reduced supply current, lower input n Low Quiescent Current: 2mA Max offset voltage, lower input bias current and higher DC gain n Input Offset Voltage: 350μV Max than other devices with comparable bandwidth. n Input Bias Current: 250nA Max The LT1800 has an input range that includes both supply n Low Voltage Noise: 8.5nV/√Hz rails and an output that swings within 20mV of either n Slew Rate: 25V/μs supply rail to maximize the signal dynamic range in low n Common Mode Rejection: 105dB supply applications. n Power Supply Rejection: 97dB n Open-Loop Gain: 85V/mV The LT1800 maintains its performance for supplies from n Operating Temperature Range: –40°C to 85°C 2.3V to 12.6V and is specifi ed at 3V, 5V and ±5V supplies. n Available in the 8-Pin SO and 5-Pin Low Profi le The inputs can be driven beyond the supplies without (1mm) ThinSOT™ Packages damage or phase reversal of the output. The LT1800 is available in the 8-pin SO package with APPLICATIONS the standard op amp pinout and in the 5-pin TSOT-23 package. For dual and quad versions of the LT1800, see n Low Voltage, High Frequency Signal Processing the LT1801/LT1802 data sheet. The LT1800 can be used n Driving A/D Converters as a plug-in replacement for many op amps to improve n Rail-to-Rail Buffer Amplifi ers input/output range and performance. n Active Filters L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Video Line Driver Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Single Supply 1A Laser Driver Amplifi er Laser Driver Amplifi er 500mA Pulse Response 5V VIN + R3 DO NOT FLOAT 10Ω Q1 LT1800 ZETEX 100mA/DIV FMMT619 – C1 39pF IR LASER INFINEON SFH495 R2 R1 330Ω 1Ω 1800 TA01a 50ns/DIV 1800 TA01b 1800fa 1

LT1800 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V – to V +) ..........................12.6V Specifi ed Temperature Range (Note 5) ....–40°C to 85°C S S Input Current (Note 2) ..........................................±10mA Junction Temperature ...........................................150°C Output Short-Circuit Duration (Note 3) ............Indefi nite Storage Temperature Range ...................–65°C to 150°C Operating Temperature Range (Note 4)....–40°C to 85°C Lead Temperature (Soldering, 10 sec).................. 300°C PIN CONFIGURATION TOP VIEW TOP VIEW NC 1 8 NC –+IINN 23 +– 76 VVSO+UT VOVUS–T 12 + – 5 VS+ +IN 3 4 –IN VS– 4 5 NC S5 PACKAGE S8 PACKAGE 5-LEAD PLASTIC TSOT-23 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 250°C/W TJMAX = 150°C, θJA = 190°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1800CS8#PBF LT1800CS8#TRPBF 1800 8-Lead Plastic SO 0°C to 70°C LT1800IS8#PBF LT1800IS8#TRPBF 1800I 8-Lead Plastic SO –40°C to 85°C LT1800CS5#PBF LT1800CS5#TRPBF LTRN 5-Lead Plastic TSOT-23 0°C to 70°C LT1800IS5#PBF LT1800IS5#TRPBF LTRP 5-Lead Plastic TSOT-23 –40°C to 85°C Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS T = 25°C. V = 5V, 0V; V = 3V, 0V; V = V = half supply, unless otherwise noted. A S S CM OUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage V = 0V 75 350 μV OS CM V = 0V (SOT-23) 300 750 μV CM V = V 0.5 3 mV CM S V = V (SOT-23) 0.7 3.5 mV CM S ΔVOS Input Offset Shift VCM = 0V to VS – 1.5V 20 180 μV I Input Bias Current V = 1V 25 250 nA B CM V = V 500 1500 nA CM S I Input Offset Current V = 1V 25 200 nA OS CM V = V 25 200 nA CM S Input Noise Voltage 0.1Hz to 10Hz 1.4 μV P-P 1800fa 2

LT1800 ELECTRICAL CHARACTERISTICS T = 25°C. V = 5V, 0V; V = 3V, 0V; V = V = half supply, unless otherwise noted. A S S CM OUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS e Input Noise Voltage Density f = 10kHz 8.5 nV/√Hz n i Input Noise Current Density f = 10kHz 1 pA/√Hz n C Input Capacitance f = 100kHz 2 pF IN A Large-Signal Voltage Gain V = 5V, V = 0.5V to 4.5V, R = 1k at V /2 35 85 V/mV VOL S O L S V = 5V, V = 1V to 4V, R = 100Ω at V /2 3.5 8 V/mV S O L S V = 3V, V = 0.5V to 2.5V, R = 1k at V /2 30 85 V/mV S O L S CMRR Common Mode Rejection Ratio V = 5V, V = 0V to 3.5V 85 105 dB S CM V = 3V, V = 0V to 1.5V 78 97 dB S CM Input Common Mode Range 0 V V S PSRR Power Supply Rejection Ratio V = 2.5V to 10V, V = 0V 80 97 dB S CM Minimum Supply Voltage (Note 6) 2.3 2.5 V V Output Voltage Swing Low (Note 7) No Load 12 50 mV OL I = 5mA 80 160 mV SINK I = 20mA 225 450 mV SINK V Output Voltage Swing High (Note 7) No Load 16 60 mV OH I = 5mA 120 250 mV SOURCE I = 20mA 450 850 mV SOURCE I Short-Circuit Current V = 5V 20 45 mA SC S V = 3V 20 40 mA S I Supply Current per Amplifi er 1.6 2 mA S GBW Gain Bandwidth Product Frequency = 2MHz 40 80 MHz SR Slew Rate V = 5V, A = –1, R = 1k, V = 4V 13 25 V/μs S V L O FPBW Full Power Bandwidth V = 5V, V = 4V 2 MHz S OUT P-P HD Harmonic Distortion V = 5V, A = 1, R = 1k, V = 2V , f = 500kHz –75 dBc S V L O P-P C t Settling Time 0.01%, V = 5V, V = 2V, A = 1, R = 1k 250 ns S S STEP V L ΔG Differential Gain (NTSC) VS = 5V, AV = +2, RL = 150Ω 0.35 % Δθ Differential Phase (NTSC) V = 5V, A = +2, R = 150Ω 0.4 Deg S V L The l denotes the specifi cations which apply over the temperature range of 0°C ≤ T ≤ 70°C. V = 5V, 0V; V = 3V, 0V; A S S V = V = half supply, unless otherwise noted. CM OUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage V = 0V l 125 500 μV OS CM V = 0V (SOT-23) l 300 1250 μV CM V = V l 0.6 3.5 mV CM S V = V (SOT-23) l 0.7 3.75 mV CM S ΔVOS Input Offset Shift VCM = 0V to VS – 1.5V l 30 275 μV V TC Input Offset Voltage Drift (Note 8) l 1.5 5 μV/°C OS I Input Bias Current V = 1V l 50 300 nA B CM V = V – 0.2V l 550 1750 nA CM S I Input Offset Current V = 1V l 25 250 nA OS CM V = V – 0.2V l 25 250 nA CM S A Large-Signal Voltage Gain V = 5V, V = 0.5V to 4.5V, R = 1k at V /2 l 30 75 V/mV VOL S O L S V = 5V, V = 1V to 4V, R = 100Ω at V /2 l 3 6 V/mV S O L S V = 3V, V = 0.5V to 2.5V, R = 1k at V /2 l 25 75 V/mV S O L S CMRR Common Mode Rejection Ratio V = 5V, V = 0V to 3.5V l 82 101 dB S CM V = 3V, V = 0V to 1.5V l 74 93 dB S CM 1800fa 3

LT1800 ELECTRICAL CHARACTERISTICS The l denotes the specifi cations which apply over the temperature range of 0°C ≤ T ≤ 70°C. C. V = 5V, 0V; V = 3V, 0V; V = V = half supply, unless otherwise noted. A S S CM OUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Common Mode Range l 0 V V S PSRR Power Supply Rejection Ratio V = 2.5V to 10V, V = 0V l 74 91 dB S CM Minimum Supply Voltage (Note 6) l 2.3 2.5 V V Output Voltage Swing Low (Note 7) No Load l 14 60 mV OL I = 5mA l 100 200 mV SINK I = 20mA l 300 550 mV SINK V Output Voltage Swing High (Note 7) No Load l 25 80 mV OH I = 5mA l 150 300 mV SOURCE I = 20mA l 600 1000 mV SOURCE I Short-Circuit Current V = 5V l 20 40 mA SC S V = 3V l 20 30 mA S I Supply Current per Amplifi er l 2 2.75 mA S GBW Gain Bandwidth Product Frequency = 2MHz l 35 75 MHz SR Slew Rate V = 5V, A = – 1, R = 1k, V = 4V l 11 22 V/μs S V L O P-P The l denotes the specifi cations which apply over the temperature range of –40°C ≤ T ≤ 85°C. V = 5V, 0V; V = 3V, 0V; V = V = A S S CM OUT half supply, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage V = 0V l 175 700 μV OS CM V = 0V (SOT-23) l 400 2000 μV CM V = V l 0.75 4 mV CM S V = V (SOT-23) l 0.9 4 mV CM S ΔVOS Input Offset Shift VCM = 0V to VS – 1.5V l 30 300 μV V TC Input Offset Voltage Drift (Note 8) l 1.5 5 μV/°C OS I Input Bias Current V = 1V l 50 400 nA B CM V = V – 0.2V l 600 2000 nA CM S I Input Offset Current V = 1V l 25 300 nA OS CM V = V – 0.2V l 25 300 nA CM S A Large-Signal Voltage Gain V = 5V, V = 0.5V to 4.5V, R = 1k at V /2 l 25 65 V/mV VOL S O L S V = 5V, V = 1.5V to 3.5V, R = 100Ω at V /2 l 2.5 6 V/mV S O L S V = 3V, V = 0.5V to 2.5V, R = 1k at V /2 l 20 65 V/mV S O L S CMRR Common Mode Rejection Ratio V = 5V, V = 0V to 3.5V l 81 101 dB S CM V = 3V, V = 0V to 1.5V l 73 93 dB S CM Input Common Mode Range l 0 V V S PSRR Power Supply Rejection Ratio V = 2.5V to 10V, V = 0V l 73 90 dB S CM Minimum Supply Voltage (Note 6) l 2.3 2.5 V V Output Voltage Swing Low (Note 7) No Load l 15 70 mV OL I = 5mA l 105 210 mV SINK I = 10mA l 170 400 mV SINK V Output Voltage Swing High (Note 7) No Load l 25 90 mV OH I = 5mA l 150 350 mV SOURCE I = 10mA l 300 700 mV SOURCE I Short-Circuit Current V = 5V l 12.5 30 mA SC S V = 3V l 12.5 30 mA S I Supply Current per Amplifi er l 2.1 3 mA S GBW Gain Bandwidth Product Frequency = 2MHz l 30 70 MHz SR Slew Rate V = 5V, A = – 1, R = 1k, V = 4V l 10 18 V/μs S V L O 1800fa 4

LT1800 ELECTRICAL CHARACTERISTICS T = 25°C, V = ±5V, V = 0V, V = 0V, unless otherwise noted. A S CM OUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage V = V – 150 500 μV OS CM S V = V – (SOT-23) 400 1000 μV CM S V = V + 0.7 3.5 mV CM S V = V + (SOT-23) 1 4.5 mV CM S ΔVOS Input Offset Shift VCM = VS– to VS+ – 1.5V 30 475 μV I Input Bias Current V = V – + 1V 25 350 nA B CM S V = V + 400 1500 nA CM S I Input Offset Current V = V – + 1V 20 250 nA OS CM S V = V + 20 250 nA CM S Input Noise Voltage 0.1Hz to 10Hz 1.4 μV P-P e Input Noise Voltage Density f = 10kHz 8.5 nV/√Hz n i Input Noise Current Density f = 10kHz 1 pA/√Hz n C Input Capacitance f = 100kHz 2 pF IN A Large-Signal Voltage Gain V = –4V to 4V, R = 1k 25 70 V/mV VOL O L V = –2V to 2V, R = 100Ω 2.5 7 V/mV O L CMRR Common Mode Rejection Ratio V = V – to 3.5V 85 109 dB CM S Input Common Mode Range V – V + V S S PSRR Power Supply Rejection Ratio V + = 2.5V to 10V, V – = 0V 80 97 dB S S V Output Voltage Swing Low (Note 7) No Load 15 60 mV OL I = 5mA 85 170 mV SINK I = 20mA 225 450 mV SINK V Output Voltage Swing High (Note 7) No Load 17 70 mV OH I = 5mA 130 260 mV SOURCE I = 20mA 450 900 mV SOURCE I Short-Circuit Current 30 50 mA SC I Supply Current per Amplifi er 1.8 2.75 mA S GBW Gain Bandwidth Product Frequency = 2MHz 70 MHz SR Slew Rate A = – 1, R = 1k, V = ±4V, Measured at V = ±2V 23 V/μs V L O O FPBW Full Power Bandwidth V = 8V 0.9 MHz O P-P HD Harmonic Distortion A = 1, R = 1k, V = 2V , f = 500kHz –75 dBc V L O P-P C t Settling Time 0.01%, V = 5V, A = 1V, R = 1k 300 ns S STEP V L ΔG Differential Gain (NTSC) AV = + 2, RL = 150Ω 0.35 % Δθ Differential Phase (NTSC) A = + 2, R = 150Ω 0.2 Deg V L The l denotes the specifi cations which apply over the temperature range of 0°C ≤ T ≤ 70°C. V = ±5V, V = 0V, V = 0V, unless A S CM OUT otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage V = V – l 200 800 μV OS CM S V = V – (SOT-23) l 450 1500 μV CM S V = V + l 0.75 4 mV CM S V = V + (SOT-23) l 1 5 mV CM S ΔVOS Input Offset Shift VCM = VS– to VS+ – 1.5V l 45 675 μV V TC Input Offset Voltage Drift (Note 8) l 1.5 5 μV/°C OS I Input Bias Current V = V – + 1V l 30 400 nA B CM S V = V + – 0.2V l 450 1750 nA CM S 1800fa 5

LT1800 ELECTRICAL CHARACTERISTICS The l denotes the specifi cations which apply over the temperature range of 0°C ≤ T ≤ 70°C. V = ±5V, V = 0V, V = 0V, unless otherwise noted. A S CM OUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I Input Offset Current V = V – + 1V l 25 300 nA OS CM S V = V + – 0.2V l 25 300 nA CM S A Large-Signal Voltage Gain V = –4V to 4V, R = 1k l 20 55 V/mV VOL O L V = –2V to 2V, R = 100Ω l 2 5 V/mV O L CMRR Common Mode Rejection Ratio V = V – to 3.5V l 82 105 dB CM S Input Common Mode Range l V – V + V S S PSRR Power Supply Rejection Ratio V + = 2.5V to 10V, V – = 0V l 74 91 dB S S V Output Voltage Swing Low (Note 7) No Load l 17 70 mV OL I = 5mA l 105 210 mV SINK I = 20mA l 250 575 mV SINK V Output Voltage Swing High (Note 7) No Load l 25 90 mV OH I = 5mA l 150 310 mV SOURCE I = 20mA l 600 1100 mV SOURCE I Short-Circuit Current l 25 45 mA SC I Supply Current per Amplifi er l 2.4 3.5 mA S GBW Gain Bandwidth Product Frequency = 2MHz l 70 MHz SR Slew Rate A = –1, R = 1k, V = ±4V, Measured at V = ±2V l 20 V/μs V L O O The l denotes the specifi cations which apply over the temperature range of –40°C ≤ T ≤ 85°C. V = ±5V, V = 0V, V = 0V, unless A S CM OUT otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage V = V – l 350 900 μV OS CM S V = V – (SOT-23) l 500 2250 μV CM S V = V + l 0.75 4.5 mV CM S V = V + (SOT-23) l 1 5.5 mV CM S ΔVOS Input Offset Shift VCM = VS– to VS+ – 1.5V l 50 750 μV V TC Input Offset Voltage Drift (Note 8) l 1.5 5 μV/°C OS I Input Bias Current V = V – + 1V l 50 450 nA B CM S V = V + – 0.2V l 450 2000 nA CM S I Input Offset Current V = V – + 1V l 25 350 nA OS CM S V = V + – 0.2V l 25 350 nA CM S A Large-Signal Voltage Gain V = –4V to 4V, R = 1k l 16 55 V/mV VOL O L V = –1V to 1V, R = 100Ω l 2 5 V/mV O L CMRR Common Mode Rejection Ratio V = V – to 3.5V l 81 104 dB CM S Input Common Mode Range l V – V + V S S PSRR Power Supply Rejection Ratio V + = 2.5V to 10V, V – = 0V l 73 90 dB S S V Output Voltage Swing Low (Note 7) No Load l 15 80 mV OL I = 5mA l 105 220 mV SINK I = 10mA l 170 400 mV SINK V Output Voltage Swing High (Note 7) No Load l 25 100 mV OH I = 5mA l 150 350 mV SOURCE I = 10mA l 300 700 mV SOURCE I Short-Circuit Current l 12.5 30 mA SC I Supply Current per Amplifi er l 2.6 4 mA S GBW Gain Bandwidth Product Frequency = 2MHz l 65 MHz SR Slew Rate A = –1, R = 1k, V = ±4V, Measured at V = ±2V l 15 V/μs V L O O 1800fa 6

LT1800 ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 4: The LT1800C/LT1800I are guaranteed functional over the may cause permanent damage to the device. Exposure to any Absolute temperature range of –40°C to 85°C. Maximum Rating condition for extended periods may affect device Note 5: The LT1800C is guaranteed to meet specifi ed performance from reliability and lifetime. 0°C to 70°C. The LT1800C is designed, characterized and expected to Note 2: The inputs are protected by back-to-back diodes and by ESD meet specifi ed performance from –40°C to 85°C but is not tested or diodes to the supply rails. If the differential input voltage exceeds 1.4V or QA sampled at these temperatures. The LT1800I is guaranteed to meet either input goes outside the rails, the input current should be limited to specifi ed performance from –40°C to 85°C. less than 10mA. Note 6: Minimum supply voltage is guaranteed by power supply rejection Note 3: A heat sink may be required to keep the junction temperature ratio test. below the absolute maximum rating when the output is shorted Note 7: Output voltage swings are measured between the output and indefi nitely. power supply rails. Note 8: This parameter is not 100% tested. TYPICAL PERFORMANCE CHARACTERISTICS V Distribution, V = 0V V Distribution, V = 5V V Distribution, V = 0V OS CM OS CM OS CM (SO-8, PNP Stage) (SO-8, NPN Stage) (SOT-23, PNP Stage) 45 45 40 VS = 5V, 0V VS = 5V, 0V VS = 5V, 0V 40 VCM = 0V 40 VCM = 5V 35 VCM = 0V %) 35 %) 35 %) 30 UNITS ( 2350 UNITS ( 2350 UNITS ( 25 RCENT OF 1250 RCENT OF 1250 RCENT OF 2105 PE 10 PE 10 PE 10 5 5 5 0 0 0 –250 –150 –50 50 150 250 –2000 –1200 –400 400 1200 2000 –1250 –750 –250 250 750 1250 INPUT OFFSET VOLTAGE (μV) INPUT OFFSET VOLTAGE (μV) INPUT OFFSET VOLTAGE (μV) 1800 G01 1800 G02 1800 G03 V Distribution, V = 5V Offset Voltage OS CM (SOT-23, NPN Stage) Supply Current vs Supply Voltage vs Input Common Mode Voltage 35 4 500 VS = 5V, 0V VS = 5V, 0V 30 VCM = 5V 400 TA = –55°C TYPICAL PART 300 OF UNITS (%) 2205 URRENT (mA) 32 TAT A= =1 2255°°CC OLTAGE (μV) 1200000 TA = 25°C PERCENT 1105 SUPPLY C 1 TA = –55°C OFFSET V–––132000000 TA = 125°C 5 –400 0 0 –500 –2500 –1500 –500 500 1500 2500 0 1 2 3 4 5 6 7 8 9 10 11 12 0 1 2 3 4 5 INPUT OFFSET VOLTAGE (μV) TOTAL SUPPLY VOLTAGE (V) INPUT COMMON MODE VOLTAGE (V) 1800 G04 1800 G05 1800 G06 1800fa 7

LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Input Bias Current Input Bias Current Output Saturation Voltage vs Common Mode Voltage vs Temperature vs Load Current (Output Low) 1.0 0.8 10 VS = 5V, 0V VS = 5V, 0V μA) 00..68 TTTAAA === 21–525°55C°°CC 00..67 NVSP N= A5VC,T 0IVVE AGE (V) 1 NT ( 0.4 A) 0.5 VCM = 5V OLT BIAS CURRE–00..220 PUT BIAS (μ 00..34 TURATION V 0.1 TA = 125°C INPUT ––00..64 IN 00..21 PVNS P= A5CVT, I0VVE TPUT SA0.01 TA = –55°C TA = 25°C –0.8 0 VCM = 1V OU –1.0 –0.1 0.001 –1 0 1 2 3 4 5 6 –60 –40 –20 0 20 40 60 80 0.01 0.1 1 10 100 INPUT COMMON MODE VOLTAGE (V) TEMPERATURE (°C) LOAD CURRENT (mA) 1800 G07 1800 G08 1800 G09 Output Saturation Voltage Output Short-Circuit Current vs Load Current (Output High) Minimum Supply Voltage vs Power Supply Voltage 10 0.6 70 VS = 5V, 0V A) 60 TA = 25°C OUTPUT SATURATION VOLTAGE (V)00.0.111 TTAA == –15255°°CC TA = 25°C CHANGE IN OFFSET VOLTAGE (mV)––0000....22044 TTTAAA === 1–225555°°C°CC TPUT SHORT-CIRCUIT CURRENT (m–––––531351422400000000000 TTTTAAAA ==== ––1155225555°°°°CCCC SVSOSI UN=R K5CIVNI,NG 0GV OU–60 TA = 25°C 0.001 –0.6 –70 0.01 0.1 1 10 100 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 1.5 2 2.5 3 3.5 4 4.5 5 LOAD CURRENT (mA) TOTAL SUPPLY VOLTAGE (V) POWER SUPPLY VOLTAGE (±V) 1800 G10 1800 G11 1800 G12 Open-Loop Gain Open-Loop Gain Open-Loop Gain 2000 2000 2000 VS = 3V, 0V VS = 5V, 0V VS = ±5V V) 1600 RL TO GND V) 1600 RL TO GND V)1600 RL TO GND E (μ 1200 E (μ 1200 E (μ1200 AG 800 AG 800 AG 800 T T T L L L T VO 400 RL = 1k T VO 400 RL = 1k T VO 400 RL = 1k SE 0 SE 0 SE 0 OFF –400 OFF –400 OFF–400 NGE IN –800 RL = 100Ω NGE IN –800 RL = 100Ω NGE IN –800 RL = 100Ω A–1200 A–1200 A–1200 H H H C C C –1600 –1600 –1600 –2000 –2000 –2000 0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 –5 –4 –3 –2 –1 0 1 2 3 4 5 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 1800 G13 1800 G14 1800 G15 1800fa 8

LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Warm-Up Drift Offset Voltage vs Output Current vs Time (LT1800S8) Input Noise Voltage vs Frequency 2.0 120 60 VS = ±5V VS = 5V, 0V mV) 1.5 110 VS = ±5V 50 GE ( 1.0 V) 100 Hz) ANGE IN OFFSET VOLTA––100...0055 TA = 25°C TA =T A– 5=5 1°C25°C OFFSET VOLTAGE (μ 86970000 VVSS == ±±21..55VV NOISE VOLTAGE (nV/√ 243000 NVCPMN =A C4T.2IV5VE H 10 C–1.5 50 PNP ACTIVE TYPICAL PART VCM = 2.5V –2.0 40 0 –60 –45 –30 –15 0 15 30 45 60 0 20 40 60 80 100 120 140 0.01 0.1 1 10 100 OUTPUT CURRENT (mA) TIME AFTER POWER-UP (SECONDS) FREQUENCY (kHz) 1800 G16 1800 G17 1800 G18 0.1Hz to 10Hz Output Voltage Input Current Noise vs Frequency Noise 3.0 2000 VS = 5V, 0V VS = 5V, 0V 2.5 V) A/√Hz) 2.0 AGE (n 1000 p T NT ( PNP ACTIVE VOL URRE 1.5 VCM = 2.5V OISE 0 C N SE 1.0 UT NOI NPN ACTIVE OUTP–1000 0.5 VCM = 4.25V 0 –2000 0.01 0.1 1 10 100 0 1 2 3 4 5 6 7 8 9 10 FREQUENCY (kHz) TIME (SECONDS) 1800 G19 1800 G20 Gain Bandwidth and Phase Gain Bandwidth and Phase Margin vs Supply Voltage Margin vs Temperature 100 100 TA = 25°C GBW PRODUCT 90 90 VS = ±2.5V 80 MHz) 80 GAIN BAPNRDOWDIDUTCHT PHA MHz)70 GBWVS P =R ±O5DVUCT PHA WIDTH ( 7600 60SE MAR WIDTH (5600 PHASE MARGIN 60SE MAR GAIN BAND PHASE MARGIN 5400GIN (DEG) GAIN BAND PHAVVSSSE = =M ± ±A52RV.G5VIN 4500GIN (DEG) 30 30 20 20 10 0 1 2 3 4 5 6 7 8 9 10 –55–35 –15 5 25 45 65 85 105 125 TOTAL SUPPLY VOLTAGE (V) TEMPERATURE (°C) 1800 G21 1800 G22 1800fa 9

LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Slew Rate vs Temperature Gain and Phase vs Frequency 35 70 100 AV = –1 30 RRFL == R1kG = 1k VS = ±2.5V 5600 PHASE 6800 B) 40 40 SLEW RATE (V/μs) 2205 VS = ±5V PEN-LOOP GAIN (d 1320000 GAIN ––2042000 PHASE (DEG) O 15 –10 –60 –20 VS = ±2.5V –80 VS = ±5V 10 –30 –100 –55–35 –15 5 25 45 65 85 105 125 0.01 0.1 1 10 100 300 TEMPERATURE ((cid:111)C) FREQUENCY (MHz) 1800 G23 1800 G24 Gain vs Frequency (A = 1) Gain vs Frequency (A = 2) Output Impedance vs Frequency V V 12 18 600 RL = 1k RL = 1k VS = ±2.5V 9 CL = 10pF 15 CL = 10pF 100 AV = 1 AV = 2 6 12 E (Ω) 10 AV = 10 N (dB) 03 VS = ±2.5V N (dB) 69 PEDANC 1 AV = 1 GAI –3 VS = ±5V GAI 3 VS = ±2.5V UT IM 0.1 AV = 2 –6 0 VS = ±5V OUTP 0.01 –9 –3 –12 –6 0.001 0.1 1 10 100 300 0.1 1 10 100 300 0.1 1 10 100 500 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) 1800 G25 1800 G26 1800 G27 Common Mode Rejection Ratio Power Supply Rejection Ratio Series Output Resistor vs Frequency vs Frequency vs Capacitive Load 120 90 60 MODE REJECTION RATIO (dB)148600000 VS = 5V, 0V UPPLY REJECTION RATIO (dB) 35678240000000 NESGUAPTPIVLYE PSOUSPVTIPTASLI VY==E 255V°, C0V OVERSHOOT (%) 2345235400005555 VASV == 51V, 0RVOS = 20Ω ROS = 10Ω COMMON 20 POWER S 100 11055 ROS = RL = 50Ω 0 –10 0 0.01 0.1 1 10 100 0.001 0.01 0.1 1 10 100 10 100 1000 10000 FREQUENCY (MHz) FREQUENCY (MHz) CAPACITIVE LOAD (pF) 1800 G28 1800 G29 1800 G30 1800fa 10

LT1800 TYPICAL PERFORMANCE CHARACTERISTICS Series Output Resistor vs Capacitive Load Distortion vs Frequency Distortion vs Frequency 60 –40 –40 5505 VASV == 52V, 0V –50 VAVSVO U==T 51=V 2, V0PV-P –50 VAVSVO U==T 52=V 2, V0PV-P 45 –60 –60 RL = 1k, RSHOOT (%) 34230055 ROS = 10Ω ORTION (dBc) ––8700 RL = 150(cid:55), 2ND RLR =L 1=5 10kΩ, ,2 3NRDD ORTION (dBc) ––8700 RL = 150Ω, 2ND 2R3NRLD D= 150Ω, E T T V S S O 20 DI DI ROS = 20Ω –90 –90 15 10 –100 –100 5 RL = 1k, 3RD RL = 1k, 3RD 0 ROS = RL = 50Ω –110 –110 10 100 1000 10000 0.01 0.1 1 10 0.01 0.1 1 10 CAPACITIVE LOAD (pF) FREQUENCY (MHz) FREQUENCY (MHz) 1800 G31 1800 G32 1800 G33 Maximum Undistorted Output Signal vs Frequency 5V Large-Signal Response 5V Small-Signal Response 4.6 4.5 )P P- V G ( 4.4 50mV/DIV SWIN 4.3 AV = 2 1V/DIV 0V GE AV = –1 A OLT 4.2 0V V UT 4.1 P T U O 4.0 VS = 5V, 0V VS = 5V, 0V 100ns/DIV 1800 G35 VS = 5V, 0V 50ns/DIV 1800 G36 RL = 1k AV = 1 AV = 1 3.9 RL = 1k RL = 1k 1k 10k 100k 1M 10M FREQUENCY (Hz) 1800 G34 ±5V Large-Signal Response ±5V Small-Signal Response Output Overdriven Recovery VIN 50mV/DIV 1V/DIV 2V/DIV 0V 0V 0V VOUT 2V/DIV 0V VS = ±5V 200ns/DIV 1800 G37 VS = ±5V 50ns/DIV 1800 G38 VS = 5V, 0V 100ns/DIV 1800 G39 AV = 1 AV = 1 AV = 2 RL = 1k RL = 1k RL = 1k 1800fa 11

LT1800 APPLICATIONS INFORMATION Circuit Description A pair of complementary common emitter stages Q14/Q15 that enable the output to swing from rail to rail constructs The LT1800 has an input and output signal range that cov- the output stage. The capacitors C2 and C3 form the lo- ers from the negative power supply to the positive power cal feedback loops that lower the output impedance at supply. Figure 1 depicts a simplifi ed schematic of the high frequency. These devices are fabricated on Linear amplifi er. The input stage is comprised of two differential Technology’s proprietary high speed complementary amplifi ers, a PNP stage Q1/Q2 and an NPN stage Q3/Q4 bipolar process. that are active over the different ranges of common mode input voltage. The PNP differential pair is active between the Power Dissipation negative supply to approximately 1.2V below the positive supply. As the input voltage moves closer toward the posi- The LT1800 amplifi er is offered in a small package, SOT-23, tive supply, the transistor Q5 will steer the tail current I1 to which has a thermal resistance of 250°C/W, θJA. So there is the current mirror Q6/Q7, activating the NPN differential a need to ensure that the die’s junction temperature should pair and the PNP pair becomes inactive for the rest of the not exceed 150°C. Junction temperature TJ is calculated input common mode range up to the positive supply. Also from the ambient temperature TA, power dissipation PD at the input stage, devices Q17 to Q19 act to cancel the bias and thermal resistance θJA: current of the PNP input pair. When Q1-Q2 are active, the T = T + (P • θ ) J A D JA current in Q16 is controlled to be the same as the current The power dissipation in the IC is the function of the sup- in Q1-Q2, thus the base current of Q16 is nominally equal ply voltage, output voltage and the load resistance. For to the base current of the input devices. The base current a given supply voltage, the worst-case power dissipation of Q16 is then mirrored by devices Q17-Q19 to cancel the P occurs at the maximum supply current and the base current of the input devices Q1-Q2. DMAX V+ R3 R4 R5 V+ V– + ESDD1 ESDD2 D1 + Q11 Q12 Q13 Q15 I2 I1 C2 +IN + D6 D8 D2 Q5 VBIAS I3 OUT D5 D7 CC V– –IN Q4 Q3 Q1 Q2 D3 ESDD4 ESDD3 BUFFER AND OUTPUT BIAS V– V+ D4 Q10 Q9 Q8 Q16 C1 Q17 Q18 Q19 Q7 Q6 Q14 R1 R2 V– 1800 F01 Figure 1. LT1800 Simplifi ed Schematic Diagram 1800fa 12

LT1800 APPLICATIONS INFORMATION output voltage is at half of either supply voltage (or the amplifi er has reverse-biased diodes connected to each sup- maximum swing is less than 1/2 supply voltage). P ply. If the output is forced beyond either supply, unlimited DMAX is given by: current will fl ow through these diodes. If the current is transient and limited to several hundred mA, and the total P = (V • I ) + (V /2)2/R DMAX S SMAX S L supply voltage is less than 12.6V, the absolute maximum Example: An LT1800 in a SOT-23 package operating on ±5V rating, no damage will occur to the device. supplies and driving a 50Ω load, the worst-case power dissipation is given by: Overdrive Protection P = (10 • 4mA) + (2.5)2/50 = 0.04 + 0.125 = 0.165W When the input voltage exceeds the power supplies, two DMAX pairs of crossing diodes D1 to D4 will prevent the output The maximum ambient temperature that the part is al- from reversing polarity. If the input voltage exceeds either lowed to operate is: power supply by 700mV, diode D1/D2 or D3/D4 will turn TA = TJ – (PDMAX • 250°C/W) on to keep the output at the proper polarity. For the phase reversal protection to perform properly, the input current = 150°C – (0.165W • 250°C/W) = 108°C must be limited to less than 10mA. If the amplifi er is Input Offset Voltage severely overdriven, an external resistor should be used to limit the overdrive current. The offset voltage will change depending upon which input stage is active. The PNP input stage is active from The LT1800’s input stages are also protected against a the negative supply rail to 1.2V of the positive supply rail, large differential input voltage of 1.4V or higher by a pair then the NPN input stage is activated for the remaining of back-back diodes D5/D8 to prevent the emitter-base input range up to the positive supply rail during which breakdown of the input transistors. The current in these the PNP stage remains inactive. The offset voltage is diodes should be limited to less than 10mA when they are typically less than 75μV in the range that the PNP input active. The worst-case differential input voltage usually stage is active. occurs when the input is driven while the output is shorted to ground in a unity gain confi guration. In addition, the Input Bias Current amplifi er is protected against ESD strikes up to 3kV on all pins by a pair of protection diodes on each pin that are The LT1800 employs a patent-pending technique to trim connected to the power supplies as shown in Figure 1. the input bias current to less than 250nA for the input common mode voltage of 0.2V above negative supply Capacitive Load rail to 1.2V of the positive rail. The low input offset volt- age and low input bias current of the LT1800 provide the The LT1800 is optimized for high bandwidth, low power precision performance especially for high source imped- and precision applications. It can drive a capacitive load ance applications. of about 75pF in a unity gain confi guration, and more for higher gain. When driving a larger capacitive load, a resistor Output of 10Ω to 50Ω should be connected between the output and the capacitive load to avoid ringing or oscillation. The The LT1800 can deliver a large output current, so the short- feedback should still be taken from the output so that the circuit current limit is set around 50mA to prevent damage resistor will isolate the capacitive load to ensure stability. to the device. Attention must be paid to keep the junction Graphs on capacitive loads indicate the transient response temperature of the IC below the absolute maximum rating of the amplifi er when driving capacitive load with a speci- of 150°C (refer to the Power Dissipation section) when the fi ed series resistor. output is continuously short-circuited. The output of the 1800fa 13

LT1800 APPLICATIONS INFORMATION Feedback Components a capacitance of 5pF (part plus PC board) will probably ring in transient response. The pole is formed at 12.7MHz When feedback resistors are used to set up gain, care must that will reduce phase margin by 32 degrees when the be taken to ensure that the pole formed by the feedback crossover frequency of the amplifi er is around 20MHz. A resistors and the total capacitance at the inverting input capacitor of 5pF or higher connected across the feedback does not degrade stability. For instance, the LT1800 in a resistor will eliminate any ringing or oscillation. noninverting gain of 2, set up with two 5k resistors and TYPICAL APPLICATIONS Single Supply 1A Laser Driver Amplifi er time domain response of this circuit, measured at R1 and given a 500mV 230ns input pulse, is also shown in the The circuit in the front page of this data sheet shows the graphic on the front page. While the circuit is capable LT1800 used in a 1A laser driver application. One of the of 1A operation, the laser diode and the transistor are reasons the LT1800 is well suited to this control task is thermally limited due to power dissipation, so they must that its 2.3V operation ensures that it will be awake during be operated at low duty cycles. power-up and operated before the circuit can otherwise cause signifi cant current to fl ow in the 2.1V threshold Fast 1A Current Sense Amplifi er laser diode. Driving the noninverting input of the LT1800 to a voltage V will control the turning on of the high A simple, fast current sense amplifi er in Figure 2 is suitable IN current NPN transistor, FMMT619 and the laser diode. for quickly responding to out-of-range currents. The circuit A current equal to V /R1 fl ows through the laser diode. amplifi es the voltage across the 0.1Ω sense resistor by IN The LT1800 low offset voltage and low input bias current a gain of 20, resulting in a conversion gain of 2V/A. The allows it to control the current that fl ows through the laser –3dB bandwidth of the circuit is 4MHz, and the uncertainty diode precisely. The overall circuit is a 1A per volt V-to-I due to VOS and IB is less than 4mA. The minimum output converter. Frequency compensation components R2 and voltage is 60mV, corresponding to 30mA. The large-signal C1 are selected for fast but zero-overshoot time domain response of the circuit is shown in Figure 3. response to avoid overcurrent conditions in the laser. The IL 3V 0A TO 1A 52.3Ω + LT1800 VOUT 0V TO 2V 0.1Ω – 500mV/DIV 52.3Ω 1k 0V 1800 F02 VOUT = 2 • IL f–3dB = 4MHz UNCERTAINTY DUE TO VOS, IB < 4mA VS = 3V 50ns/DIV 1800 F03 Figure 2. Fast 1A Current Sense Figure 3. Current Sense Amplifi er Large-Signal Response 1800fa 14

LT1800 TYPICAL APPLICATIONS Single 3V Supply, 1MHz, 4th Order Butterworth Filter rail-to-rail for maximum dynamic range. Figure 5 displays the frequency response of the fi lter. Stopband attenuation The circuit shown in Figure 4 makes use of the low voltage is greater than 100dB at 50MHz. With a 2.25V , 250kHz operation and the wide bandwidth of the LT1800 to create P-P input signal, the fi lter has harmonic distortion products a DC accurate 1MHz 4th order lowpass fi lter powered from of less than –85dBc. Worst-case output offset voltage is a 3V supply. The amplifi ers are confi gured in the inverting less than 6mV. mode for the lowest distortion and the output can swing 909Ω 47pF 3V 909Ω 2.67k 1.1k 22pF VIN – 1.1k 2.21k 220pF LT1800 – + 470pF LT1800 VOUT + VS/2 1800 F04 Figure 4. 3V, 1MHz, 4th Order Butterworth Filter 0 –20 B)–40 d N ( AI–60 G –80 –100 –120 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) 1800 F05 Figure 5. Frequency Response of Filter 1800fa 15

LT1800 PACKAGE DESCRIPTION S5 Package 5-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1635) 0.62 0.95 2.90 BSC MAX REF (NOTE 4) 1.22 REF 1.50 – 1.75 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT 0.30 – 0.45 TYP 0.95 BSC PER IPC CALCULATOR 5 PLCS (NOTE 3) 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 1.90 BSC NOTE: (NOTE 3) S5 TSOT-23 0302 REV B 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 1800fa 16

LT1800 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 .045 ±.005 (4.801 – 5.004) .050 BSC NOTE 3 8 7 6 5 .245 MIN .160 ±.005 .150 – .157 .228 – .244 (3.810 – 3.988) (5.791 – 6.197) NOTE 3 .030 ±.005 TYP 1 2 3 4 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° .053 – .069 (0.254 – 0.508) (1.346 – 1.752) .004 – .010 .008 – .010 (0.203 – 0.254) 0°– 8° TYP (0.101 – 0.254) .016 – .050 .014 – .019 .050 (0.406 – 1.270) (0.355 – 0.483) (1.270) NOTE: INCHES TYP BSC 1. DIMENSIONS IN (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) SO8 0303 1800fa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. 17 However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LT1800 TYPICAL APPLICATION Low Power High Voltage Amplifi er DC output voltage. When no signal is present, the op amp output sits at about mid-supply. Transistors Q1 and Certain materials used in optical applications have charac- Q3 create bias voltages for Q2 and Q4, which are forced teristics that change due to the presence and strength of a into a low quiescent current by degeneration resistors DC electric fi eld. The voltage applied across these materials R4 and R5. When a transient signal arrives at V , the op should be precisely controlled to maintain desired proper- IN amp output moves and causes the current in Q2 or Q4 ties, sometimes as high as 100’s of volts. The materials to change depending on the signal polarity. The current, are not conductive and represent a capacitive load. limited by the clipping of the LT1800 output and the 3kΩ The circuit of Figure 6 shows the LT1800 used in an ampli- of total emitter degeneration, is mirrored to the output fi er capable of a 250V output swing and providing precise devices to drive the capacitive load. The LT1800 output then returns to near mid-supply, providing the precise DC 130V output voltage to the load. The attention to limit the current of the output devices minimizes power dissipation thus 5V 4.99k 1k allowing for dense layout, and inherits better reliability. 10k Q5 Q6 Figure 7 shows the time domain response of the amplifi er 0.1(cid:77)F providing a 200V output swing into a 100pF load. Q1 Q2 5V 5V R4 R6 + 2k 2k R2 LT1800 VOUT 2k – R5 R7 MATERIAL UNDER 2k 2k ELECTRIC FIELD 100pF VIN 2V/DIV Q3 Q4 VIN R1 2k 3C91pF 10k Q7 Q8 A±1V3 =0 VV OSUUTP/VPILNY = I –Q1 =0 0130(cid:77)A 50VV/ODUIVT OUTPUT SWING = ±128.8V C2 R3 OUTPUT OFFSET(cid:32) 20mV 8pF 200k 4.99k 1k OUTPUT SHORT-CIRCUIT CURRENT (cid:32) 3mA 150V 10% TO 90% RISE TIME (cid:32) 8(cid:77)s, 200V OUTPUT STEP SMALL-SIGNAL BANDWIDTH (cid:32) 150kHz Q1, Q2, Q7, Q8: ON SEMI MPSA42 –130V Q3, Q4, Q5, Q6: ON SEMI MPSA92 10μs/DIV 1800 F07 1800 F06 Figure 6. Low Power, High Voltage Amplifi er Figure 7. Large-Signal Time Domain Response of the Amplifi er RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1399 Triple 300MHz Current Feedback Amplifi er 0.1dB Gain Flatness to 150MHz, Shutdown LT1498/LT1499 Dual/Quad 10MHz, 6Vμs Rail-to-Rail Input and Output C-Load™ Op Amps High DC Accuracy, 475μV V , 4mV/°C Max Drift, OS(MAX) Max Supply Current 2.2mA per Amp LT1630/LT1631 Dual/Quad 30MHz, 10V/μs Rail-to-Rail Input and Output Op Amps High DC Accuracy, 525μV V , 70mA Output Current, OS(MAX) Max Supply Current 4.4mA per Amplifi er LT1801/LT1802 80MHz, 25V/μs Low Power Rail-to-Rail Input/Output Precision Op Amps Dual/Quad Version of the LT1800 LT1806/LT1807 Single/Dual 325MHz, 140V/μs Rail-to-Rail Input and Output Op Amps High DC Accuracy, 550μV V , Low Noise 3.5nV/√Hz, OS(MAX) Low Distortion –80dB at 5MHz, Power-Down (LT1806) LT1809/LT1810 Single/Dual 180MHz Rail-to-Rail Input/Output Op Amps 350V/μs Slew Rate, Low Distortion –t at 5MHz, Power-Down (LT1809) C-Load is a trademark of Linear Technology Corporation. 1800fa 18 Linear Technology Corporation LT 0709 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2009

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LT1800CS5#PBF LT1800IS5#TR LT1800CS5#TRMPBF LT1800IS5#TRPBF LT1800CS5 LT1800IS5#TRM LT1800CS5#TR LT1800CS8#TR LT1800IS8#TRPBF LT1800IS8 LT1800IS5 LT1800CS8 LT1800IS8#PBF LT1800CS8#TRPBF LT1800CS8#PBF LT1800IS8#TR LT1800IS5#PBF LT1800IS5#TRMPBF LT1800CS5#TRM LT1800CS5#TRPBF