LT1077 Micropower, Single Supply, Precision Op Amp FEATURES DESCRIPTIOU ■ 60µA Max Supply Current The LT®1077 is a micropower precision operational ■ 40µV Max Offset Voltage amplifier optimized for single supply operation at 5V. In ■ 350pA Max Offset Current addition, ±15V specifications are provided. ■ 0.5µV 0.1Hz to 10Hz Voltage Noise Micropower performance of competing devices is P-P ■ 2.5pA 0.1Hz to 10Hz Current Noise achieved at the expense of seriously degrading precision, P-P ■ O.4µV/°C Offset Voltage Drift noise, speed, and output drive specifications. The LT1077 reduces supply current without sacrificing other ■ 250kHz Gain-Bandwidth Product parameters. The offset voltage achieved is the lowest ■ 0.12V/µs Slew Rate of any micropower op amp. Offset current, voltage ■ Single Supply Operation and current noise, slew rate and gain-bandwidth product Input Voltage Range Includes Ground are all two to ten times better than on previous micropower Output Swings to Ground while Sinking Current op amps. No Pull-Down Resistors are Needed The 1/f corner of the voltage noise spectrum is at 0.7Hz. ■ Output Sources and Sinks 5mA Load Current This results in low frequency (0.1Hz to 10Hz) noise performance which can only be found on devices with an APPLICATIOU S order of magnitude higher supply current. The LT1077 is completely plug-in compatible (including ■ Replaces OP-07, OP-77, AD707, LT1001, LT1O12 nulling) with all industry standard precision op amps. at 10 to 60 Times Lower Power Thus, it can replace these precision op amps in many ■ Battery or Solar Powered Systems applications without sacrificing performance, yet with ■ 4mA to 2OmA Current Loops significant power savings. ■ Two Terminal Current Source The LT1077 can be operated from one lithium cell or two ■ Megaohm Source Resistance Difference Amplifier Ni-Cad batteries. The input range goes below ground. The all-NPN output stage swings to ground while sinking , LTC and LT are registered trademarks of Linear Technology Corporation. current—no pull-down resistors are needed. For dual and quad op amps with similar specifications please see the LT1078/LT1079 datasheet. TYPICAL APPLICATIOU Distribution of Input Offset Voltage 35 Self Buffered Micropower Reference VS = 5V, 0V 30 TA = 25°C 3.6V TO 9V 1072 UNITS S 25 TESTED IN 2 –LT10777 6 O1±.1U2.T32P0%VU MTAX T OF UNIT 20 HPA, JC8K,A NG8ES 3 + EN 15 C 4 SUPPLY CURRENT = 60µA MAX ER SOURCES UP TO 10mA P 10 750k LT1034 LOAD REGULATION = 30µV/mA 0.1µF 1.2V TEMPERATURE DRIFT = 12ppm/°C 5 LT1077 • TA01 0 –40 –30 –20 –10 0 10 20 30 40 INPUT OFFSET VOLTAGE (µV) LT1077 • TA02 1077fa 1

LT1077 ABSOLUTE W AXIW UW RATIU GS (Note 1) Supply Voltage ......................................................±22V Operating Temperature Range Differential Input Voltage.......................................±30V LT1077AM/LT1077M (OBSOLETE)....–55°C to 125°C Input Voltage...............Equal to Positive Supply Voltage LT1077AI/LT1077I.............................. –40°C to 85°C Input Voltage............5V Below Negative Supply Voltage LT1077AC/LT1077C/LT1077S8...............0°C to 70°C Output Short-Circuit Duration..........................Indefinite Storage Temperature Range.................–65°C to 150°C Lead Temperature (Soldering, 10 sec)..................300°C PACKAGE/ORDER IU FORW ATIOU TOP VIEW VOS TRIM TOP VIEW TOP VIEW 8 VOS TRIM 1 7 V+ VOS TRIM 1 8 VOS TRIM VOS TRIM 1 8 VOS TRIM A B –IN 2 – + + – 6 OUT –IN 2 7 V+ –IN 2 7 V+ +IN 3 6 OUT +IN 3 6 OUT +IN 3 5 NC 4 V– 4 5 NC V– 4 5 NC V– H PACKAGE J8 PACKAGE N8 PACKAGE S8 PACKAGE 8-LEAD TO-5 METAL CAN 8-LEAD CERDIP 8-LEAD PDIP 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 150°C/W, θJC = 45°C/W TJMAX = 150°C, θJA = 100°C/W TJMAX = 100°C, θJA = 130°C/W TJMAX = 150°C, θJA = 190°C/W ORDER PART NUMBER ORDER PART NUMBER ORDER PART NUMBER S8 PART MARKING LT1077AMH LT1077AMJ8 LT1077S8 1077 LT1077MH LT1077MJ8 LT1077IS8 1077I LT1077ACH LT1077ACJ8 LT1077AIN8 LT1077CH LT1077CJ8 LT1077IN8 OBSOLETE PACKAGE LT1077ACN8 LT1077CN8 Consider the N8 or S8 Package for Alternate Source LT1077 • POI01 Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless noted. LT1077AM/AI/AC LT1077M/I/C/S8 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage 9 40 10 60 µV LT1077S8 12 150 µV ∆VOS Long Term Input Offset 0.4 0.4 µV/Mo ∆Time Voltage Stability I Input Offset Current 0.06 0.35 0.06 0.45 nA OS I Input Bias Current 7 9 7 11 nA B en Input Noise Voltage 0.1Hz to 10Hz (Note3) 0.5 1.1 0.5 µVP-P Input Noise Voltage Density fO = 10Hz (Note 3) 28 43 28 nV/√Hz fO = 1000Hz (Note3) 27 35 27 nV/√Hz i Input Noise Current 0.1Hz to 10Hz (Note3) 2.5 4.5 2.5 pA n P-P 1077fa 2

LT1077 ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless noted. LT1077AM/AI/AC LT1077M/I/C/S8 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Input Noise Current Density fO = 10Hz (Note 3) 0.065 0.11 0.065 pA/√Hz fO = 1000Hz 0.02 0.02 pA/√Hz Input Resistance (Note 4) Differential Mode 350 700 270 700 MΩ Common Mode 6 6 GΩ Input Voltage Range 3.5 3.8 3.5 3.8 V 0 –0.3 0 –0.3 V CMRR Common Mode Rejection Ratio V = 0V to 3.5V 97 106 94 105 dB CM PSRR Power Supply Rejection Ratio V = 2.3V to 12V 102 118 100 117 dB S A Large-Signal Voltage Gain V = 0.03V to 4V, No Load 300 1000 240 1000 V/mV VOL O V = 0.03V to 3.5V, R = 50k 250 1000 200 1000 V/mV O L Maximum Output Voltage Output Low, No Load 3.5 6 3.5 6 mV Swing Output Low, 2k to GND 0.7 1.1 0.7 1.1 mV Output Low, lSINK = 100µA 90 130 90 130 mV Output High, No Load 4.2 4.4 4.2 4.4 V Output High, 2k to GND 3.5 3.9 3.5 3.9 V SR Slew Rate (Note 2) 0.05 0.08 0.05 0.08 V/µs GBW Gain Bandwidth Product fO ≤ 20kHz 230 230 kHz IS Supply Current 48 60 48 68 µA Offset Adjustment Range Rpot = 10k, Wiper to V+ ±500 ±900 ±500 ±900 µV Minimum Supply Voltage (Note 5) 2.2 2.3 2.2 2.3 V The ● denotes the specifications which apply over the temperature range of –55°C ≤ TA ≤ 125°C for AM/M grades, –40°C ≤ TA ≤ 85°C for AI/I grades. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V unless otherwise noted. LT1077AM/AI LT1077M/I SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage ● 50 200 60 260 µV ∆VOS/∆T Input Offset Voltage Drift LT1077IS8 (Note 6) ● 1 2.5 µV/°C I Input Offset Current ● 0.08 0.60 0.08 0.80 nA OS I Input Bias Current ● 8 11 8 13 nA B CMRR Common Mode Rejection Ratio V = 0.05V to 3.2V ● 92 104 88 103 dB CM PSRR Power Supply Rejection Ratio V = 3.1V to 12V ● 98 114 94 113 dB S A Large-Signal Voltage Gain V = 0.05V to 3.5V, R = 50k ● 120 600 100 600 V/mV VOL O L Maximum Output Voltage Output Low, No Load ● 4.5 8 4.5 8 mV Swing Output Low, ISINK = 100µA ● 120 170 120 170 mV Output High, No Load ● 3.9 4.2 3.9 4.2 V Output High, 2k to GND ● 3 3.7 3 3.7 V IS Supply Current ● 54 80 54 90 µA 1077fa 3

LT1077 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C otherwise, specifications are at TA = 25°C. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V unless noted. LT1077AC LT1077C/S8 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage ● 30 110 35 150 µV LT1077S8 ● 40 280 µV ∆VOS/∆T Input Offset Voltage Drift (Note 6) ● 0.4 1.6 0.5 2.0 µV/°C LT1077S8 (Note 6) 0.7 3.0 µV/°C I Input Offset Current ● 0.07 0.45 0.07 0.60 nA OS I Input Bias Current ● 7 10 7 12 nA B CMRR Common Mode Rejection Ratio V = 0V to 3.4V ● 94 105 90 104 dB CM PSRR Power Supply Rejection Ratio V = 2.6V to 12V ● 100 116 97 115 dB S A Large-Signal Voltage Gain V = 0.05V to 3.5V, R = 50k ● 180 800 150 800 V/mV VOL O L Maximum Output Voltage Swing Output Low, No Load ● 4.0 7 4.0 7 mV Output Low, ISINK = 100µA ● 100 150 100 150 mV Output High, No Load ● 4.1 4.3 4.1 4.3 V Output High, 2k to GND ● 3.3 3.8 3.3 3.8 V IS Supply Current ● 52 70 52 80 µA VS = ±15V, TA = 25°C unless noted. LT1077AM/AI/AC LT1077M/I/C/S8 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage 20 150 25 200 µV LT1077S8 30 300 µV I Input Offset Current 0.06 0.35 0.06 0.45 nA OS I Input Bias Current 7 9 7 11 nA B Input Voltage Range 13.5 13.8 13.5 13.8 V –15.0 –15.3 –15.0 –15.3 V CMRR Common Mode Rejection Ratio V = 13.5V to –15V 100 109 97 108 dB CM PSRR Power Supply Rejection Ratio VS = 5V, 0V to ±18V 106 122 103 120 dB AVOL Large-Signal Voltage Gain VO = ±10V, RL = 50k 1000 8000 800 8000 V/mV VO = ±10V, RL = 2k 400 1500 300 1500 V/mV VOUT Maximum Output Voltage Swing RL = 50k ±13.0 ±14.0 ±13.0 ±14.0 V RL = 2k ±11.0 ±13.2 ±11.0 ±13.2 V SR Slew Rate 0.07 0.12 0.07 0.12 V/µs IS Supply Current 56 75 56 85 µA 1077fa 4

LT1077 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the temperature range of –55°C ≤ TA ≤ 125°C for AM/M grades, –40°C ≤ TA ≤ 85°C for AI/I grades. VS = ±15V unless otherwise noted. LT1077AM/AI LT1077M/I SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage ● 60 330 75 450 µV ∆VOS/∆T Input Offset Voltage Drift LT1077IS8 (Note 6) ● 1.1 3 µV/°C I Input Offset Current ● 0.08 0.60 0.08 0.80 nA OS I Input Bias Current ● 8 11 8 13 nA B AVOL Large-Signal Voltage Gain VO = ±10V, RL = 5k ● 300 1000 250 1000 V/mV CMRR Common Mode Rejection Ratio V = 13V, –14.9V ● 94 107 90 106 dB CM PSRR Power Supply Rejection Ratio VS = 5V, 0V to ±18V ● 100 118 97 116 dB Maximum Output Voltage Swing RL = 5k ● ±11 ±13.5 ±11 ±13.5 V IS Supply Current ● 60 95 60 105 µA The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = ±15V unless otherwise noted. LT1077AC LT1077C/S8 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage ● 40 230 50 320 µV LT1077S8 ● 65 450 µV ∆VOS/∆T Input Offset Voltage Drift (Note 6) ● 0.4 1.8 0.5 2.5 µV/°C LT1077S8 (Note 6) ● 0.8 3.5 µV/°C I Input Offset Current ● 0.07 0.45 0.07 0.60 nA OS I Input Bias Current ● 7 10 7 12 nA B AVOL Large-Signal Voltage Gain VO = ±10V, RL = 5k ● 500 2000 400 2000 V/mV CMRR Common Mode Rejection Ratio V = 13V, –15V ● 97 108 94 107 dB CM PSRR Power Supply Rejection Ratio VS = 5V, 0V to ±18V ● 103 120 100 118 dB Maximum Output Voltage Swing RL = 5k ● ±11 ±13.6 ±11 ±13.6 V IS Supply Current ● 59 85 59 95 µA Note 1: Absolute Maximum Ratings are those values beyond which the life Note 4: This parameter is guaranteed by design and is not tested. of a device may be impared. Note 5: Power supply rejection ratio is measured at the minimum supply Note 2: Slew rate at 5V, 0V is guaranteed by inference from the slew rate voltage. The op amps actually work at 1.8V supply but with a typical offset measurement at ±15V. skew of –300µV. Note 3: This parameter is tested on a sample basis only. All noise Note 6: This parameter is not 100% tested. parameters are tested with VS = ± 2.5V, VO = 0V. 1077fa 5

LT1077 TYPICAL PERFORW AU CE CHARACTERISTICS Input Bias and Offset Currents Input Bias Currents vs Supply Current vs Temperature vs Temperature Common Mode Voltage A) –1 p NT (100 VS = 5V, 0V TO ±15V VS = 5V, 0V 60 RRE 75 IOS –3 SUPPLY CURRENT (A)µ 50 VVSS == ±5V15, V0V NT (nA)OFFSET CU –560 IB NPUT BIAS CURRENT (nA) –––975 TA = 25T°AC = 125°CTA = 55°C 40 RRE –7 I–11 U C S A –13 –50 –25 0 25 50 75 100 125 BI –8–50 –25 0 25 50 75 100 125 –1 0 1 2 3 4 COMMON MODE VOLTAGE (V) TEMPERATURE (˚C) TEMPERATURE (°C) LT1077 • TPC03 LT1077 • TPC01 LT1077 • TPC02 0.1Hz to 10Hz Noise 0.01Hz to 10Hz Noise Noise Spectrum 1000 VS = ± 2.5V VS = ± 2.5V VS = ±2.5V NOISE VOLTAGE (0.4V/DIV)µ TA = 2.5°C NOISE VOLTAGE (0.4V/DIV)µ 0.4Vµ TA = 2.5°C LTAGE NOISE DENSITY (nV/Hz)√RRNET NOISE DENSITY (fA/Hz)√13003000 VNCNOOUOLISRITSEAREGENET CVIUOS(R LAURTTINSAE VC TGN4SHAET% A= =NN N L±2OOGE15IISE5SS°DCVSEE OU 1/f CORNER VC 0.7Hz 10 0 2 4 6 8 10 0 20 40 60 80 100 0.1 1 10 100 1000 TIME (SECONDS) TIME (SECONDS) FREQUENCY (Hz) LT1077 • TPC04 LT1077 • TPC05 LT1077 • TPC06 Distribution of Offset Voltage Drift Distribution of Input Offset Voltage 10Hz Voltage Noise Distribution with Temperature (In All Packages) in Small Outline (S8) Package 35 70 30 VTAS == 2±. 52°.5CV 30 VVSC M= =5 V0,. 10VV 4(10000 U INNI ETASC THE SPTAECDKAGE) 60 VTAS == 255V°, C0V 4T5E6S TUENDITS 25 50 S S S NIT NIT NIT OF U 20 OF U 20 OF U 40 CENT 15 CENT CENT 30 R R R PE 10 PE 10 PE 20 5 10 0 0 0 25 30 35 40 –2.0 –1.0 0 1.0 2.0 –150–120–90–60 –30 0 30 60 90 120150 VOLTAGE NOISE DENSITY (nV/√Hz) OFFSET VOLTAGE DRIFT WITH TEMPERATURE (nV/°C) INPUT OFFSET VOLTAGE (µV) LT1077 • TPC07 LT1077 • TPC08 LT1077 • TPC09 1077fa 6

LT1077 TYPICAL PERFORW AU CE CHARACTERISTICS Voltage Gain vs Frequency Gain, Phase vs Frequency Capacitive Load Handling 140 30 120 PHASE TA = 25°C MARGIN VS = 5V, 0V 120 66° 100 100 TA = 25°C PHASE 100 20 120 S) VOLTAGE GAIN (dB) 62480000 VS = V5VS ,= 0 ±V15V VOLTAGE GAIN (dB) 100 5V, 0VGAIN MP±AH51RA45G°SVIEN 5V, 0V ±15V 111246800000 PHASE SHIFT (DEGREE OVERSHOOT (%) 864000 AV = 5 AV = 1 AV = 10 0 TCAL == 2250°pCF 20 –20 –10 0 0.01 0.1 1 10 100 1k 10k 100k 1M 10k 30k 100k 300k 1M 10 100 1000 10,000 FREQUENCY (Hz) FREQUENCY (Hz) CAPACITIVE LOAD (pF) LT1077 • TPC10 LT1077 • TPC11 LT1077 • TPC12 Slew Rate, Gain Bandwidth Product and Phase Margin vs Large-Signal Transient Large-Signal Transient Temperature Response VS = 5V, 0V Response VS = ±15V 0.14 s)µ fO = 20kHz SLEW ±15V V/0.12 AIN BANDWIDTH SLEW RATE (PRODUCT (kHz)0002222...01004628060000 SφGGφMLBBMEWW ± W± 15±5 55V1VVV,5, ,0V0 0VVV 7865400000 PHASE MARGIN (DEGREES) 1V/DIVANVO =L O1AD 50µs/DIV 0V 5V/DIVANVO =L O1AD 100µs/DIV 0V G 180 INPUT PULSE 0V TO 3.8V –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) LT1077 • TPC13 Small-Signal Transient Response Small-Signal Transient Response Small-Signal Transient Response VS = 5V, 0V VS = ± 2.5V VS = ±15V mV/DIV 0.1V mV/DIV 0V mV/DIV 0V 20 20 20 AV = 1 10µs/DIV AV = 1 10µs/DIV AV = 1 10µs/DIV CL = 15pF CL = 15pF CL = 15pF INPUT 50mV TO 150mV 1077fa 7

LT1077 TYPICAL PERFORW AU CE CHARACTERISTICS Minimum Supply Voltage Warm-Up Drift Voltage Gain vs Load Resistance 100 0.8 10M V– = 0V 70°C VS = ±15V 1. 25°C 1 LTAGE (V)µ –1000 –0.1 ≤ V1C2M5° ≤C 0.4V VOLTAGE (V)µ 0.6 WAITMATA M=VR ESM2A 5= S°U 5CUPVR ,D A0RBVILF IYTS LOW N (V/V) 23.. –12555°°CC VS = ±15V 23 PUT OFFSET VO ––320000 NFUONNCTIONAL 25°C 0°C –55°C NGE IN OFFSET 00..42 VOLTAGE GAI 1M 456 N A I –400 CH 4. –55°C 5. 25°C VS = 5V, 0V 6. 125°C –500 0 100k 0 1 2 3 0 1 2 3 100 1k 10k 100k 1M POSITIVE SUPPLY VOLTAGE (V) TIME AFTER POWER ON (MINUTES) LOAD RESISTANCE TO GROUND (Ω) LT1077 • TPC19 LT1077 • TPC20 LT1077 • TPC21 Output Saturation vs Temperature Output Voltage Swing vs Short-Circuit Current vs vs Sink Current Load Current Time 1000 V+ 40 VS = 5V, 0V ISINK = 2mA 125°C 25°C 30 LTAGE (mV)100 IISISSINIINNKKK = == 1 1100m0µµAAA E SWING (V)VV++ –– 21 –55°C URRENT (mA)SOURCING 2100 TTTAAA === 212525°5°CC°C,, V,V VSS S== = 5± V51V5, V0, V0V ON VO OLTAG CUIT C 0 TA = 125°C, VS = ±15V SATURATI 10 ISNINOK L =O 1AµDA OUTPUT VVV–– ++ 21 25°C 125°C SHORT-CIRSINKING––2100 TA = 125°C, VS = ±15V –30 TA = 25°C, VS = ±15V 0 RL = 5k TO GROUND V– –55°C –40 –50 –25 0 25 50 75 100 125 0.01 0.1 1 10 0 1 2 3 TIME FROM OUTPUT SHORT TO GROUND (MINUTES) TEMPERATURE (°C) SOURCING OR SINKING LOAD CURRENT (mA) LT1077 • TPC22 LT1077 • TPC23 LT1077 • TPC24 Common Mode Range vs Undistorted Output Swing Closed Loop Output Temperature vs Frequency Impedance COMMON MODE RANGE (V)VVVV–++– –––+VV 1211+– VV+– == 20.V5 VT OT O– 1188VV PEAK-TO-PEAK OUTPUT SWING, V = 15V (V)±S2310000 VSR =L 5≥V 1V, kS0R VL= =± 1350Vk VTLS AO= A= 5D 2V 5R, °0LCV, T,VR ORSL L G=≥ ≥ R±1 O1100U500VkNkD 012345SPEAK-TO-PEAK OUTPUT SIWNG, V = 5V, 0V (V OUTPUT IMPEDANCE ()Ω 10011.0011k AV = 100 AV A=V 1 =0 1 –50 –25 0 25 50 75 100 125 100 1k 10k 100k) 10 100 1k 10k 100k TEMPERATURE (°C) FREQUENCY (Hz) FREQUENCY (Hz) LT1077 • TPC25 LT1077 • TPC26 LT1077 • TPC27 1077fa 8

LT1077 TYPICAL PERFORW AU CE CHARACTERISTICS Common Mode Rejection Ratio Power Supply Rejection Ratio vs Frequency vs Frequency 120 120 B) TA = 25°C B) ATIO (d100 VS = ±15V ATIO (d100 PSOUSPIPTLIVYE R R N 80 N 80 O O REJECTI 60 VS = 5V, 0V REJECTI 60 NEGATIVE DE LY SUPPLY MO 40 UPP 40 N S O R OMM 20 OWE 20 VS = ±2.5V + 1VP-P SINE WAVE C P TA = 25°C 0 0 10 100 1k 10k 100k 1M 0.1 1 10 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) LT1077 • TPC28 LT1077 • TPC29 APPLICATIOU S IU FORW ATIOU The LT1077 is fully specified with V+ = 5V, V– = 0V, The LT1077 replaces and upgrades such micropower op V = 0.1V. This set of operating conditions appears to be amps as the OP-20, LM4250, and OP-90, provided that the CM the most representative for battery powered micropower external nulling circuitry (and set resistor in the case of the circuits. Offset voltage is internally trimmed to a minimum LM4250) are removed. Since the offset voltage of the value at these supply voltages. When 9V or 3V batteries, LT1077 is extremely low, nulling will be unnecessary in or ±2.5V dual supplies are used, bias and offset current most applications. changes will be minimal. Offset voltage changes will be just a few microvolts as given by the PSRR and CMRR Single Supply Operation specifications. For example, if PSRR = 114dB ( = 2µV/V), The LT1077 is fully specified for single supply operation, at 9V the offset voltage change will be 8µV. Similarly, (i.e., when the negative supply is 0V). Input common VS ±2.5V, VCM = 0 is equivalent to a common mode voltage mode range goes below ground and the output swings change of 2.4V or a VOS change of 7µV if within a few millivolts of ground while sinking current. All CMRR = 110dB (3µV/V). competing micropower op amps either cannot swing to A full set of specifications is also provided at ±15V supply within 600mV of ground (OP-20, OP-220, OP-420) or voltages for comparison with other devices and for need a pull-down resistor connected to the output to completeness. swing to ground (OP-90, OP-290, OP-490, HA5141/42/ 44). This difference is critical because in many applica- The LT1077 is pin compatible to, and directly replaces, tions these competing devices cannot be operated as such precision op amps as the OP-07, OP-77, AD7O7 and micropower op amps and swing to ground simultaneously. LT1001 with 30 to 60 times savings in supply current. The LT1077 is also a direct plug-in replacement for LT1012 Consider the difference amplifiers shown in Typical and OP-97 devices with 10 times lower dissipation. Applications as an example. When the common mode Compatibility includes externally nulling the offset signal is high and the output low, the amplifier has to sink voltage, as all of the devices above are trimmed with current. In the gain of 10 circuit, the competing devices a potentiometer between Pins 1 and 8 and the wiper require a 30k pull-down resistor at the output to handle the tied to V+. specified signals. (The LT1077 does not need pull-down 1077fa 9

LT1077 APPLICATIOU S IU FORW ATIOU resistors.) When the output is high the pull-down resistor Single supply operation can also create difficulties at the draws 80µA which dominates the micropower current input. The driving signal can fall below 0V—inadvertently budget. This situation is much worse in the gain of one or on a transient basis. If the input is more than a few circuit with V–=0V. At 100V common mode, the output has hundred millivolts below ground, two distinct problems to sink 2µA. At a minimum output voltage of 20mV can occur on previous single supply designs, such as the competing devices require a 10k pull-down resistor. As LM124, LM158, OP-20, OP-21, OP-220, OP-221, OP-420 the output now swings to 10V, this resistor draws 1mA of (a and b), OP-90/290/490 (b only): current. a) When the input is more than a diode drop below Since the output of the LT1077 cannot go exactly to ground, unlimited current will flow from the substrate ground, but can only approach ground to within a few (V– terminal) to the input (this can destroy the unit). On the millivolts, care should be exercised to ensure that the LT1077, resistors in series with the input protect the output is not saturated. For example, a 1mV input signal device even when the input is 5V below ground. will cause the amplifier to set up in its linear region in the b) When the input is more than 400mV below ground gain 100 configuration shown below; however, it is not (at 25°C), the input stage saturates and phase reversal enough to make the amplifier function properly in the occurs at the output (this can cause lock-up in servo voltage follower mode. systems). Due to a unique phase reversal protection circuitry, the LT1077’s output does not reverse, as Gain 100 Amplifier Voltage Follower illustrated below, even when the input is at –1.0V. 5V 5V R 99R – – OUTPUT 100mV SATURATED ≈ 3.5mV 1mV + 1mV + LT1077 • AI01 Voltage Follower with Input Exceeding the Negative Common Mode Range (V = 5V, 0V) S 4V 4V 4V 2V 2V 2V 0 0 0 6VP-P INPUT 1ms/DIV OP-90 1ms/DIV LT1077 1ms/DIV –1.0 TO 5.0V EXHIBITS OUTPUT NO PHASE REVERSAL PHASE REVERSAL 1077fa 10

LT1077 APPLICATIOU S IU FORW ATIOU Comparator Applications The single supply operation of the LT1077 and its lends itself to use as a precision comparator with ability to swing close to ground while sinking current, TTL compatible output. Comparator Rise Response Time Comparator Fall Response Time to 10mV, 5mV, 2mV Overdrive to 10mV, 5mV, 2mV Overdrive V) 4 V) 4 T ( T ( U U TP 2 TP 2 U U O O V) 0 V) 0 T (m 0 T (m 100 U U P P IN –100 IN 0 VS = 5V, 0V 200µs/DIV VS = 5V, 0V 200µs/DIV TYPICAL APPLICATIOU S Megaohm Input Impedance Gain of 10 Difference Amplifier 10M 3V – 1M 2 7 INPUT 6 OUTPUT + 1M 3 0.005 TO 2.4V 4 10M BANDWIDTH =20KHZ OUTPUT OFFSET =0.7mV OUTPUT NOISE =80µVPP (0.1Hz TO 10Hz) 260µVRMS OVER FULL BANDWIDTH SUPPLY CURRENT =45µA THE USEFULNESS OF DIFFERENCE AMPLIFIERS IS LIMITED BY THE FACT THAT THE INPUT RESISTANCE IS EQUAL TO THE SOURCE RESISTANCE. THE PICO-AMPERE OFFSET CURRENT AND LOW CURRENT NOISE OF THE LT1077 ALLOWS THE USE OF 1M SOURCE RESISTORS WITHOUT DEGRADATION IN PERFORMANCE. IN ADDITION, WITH MEGAOHM RESISTORS MICROPOWER OPERATION CAN BE MAINTAINED LT1077 • TA03 1077fa 11

LT1077 TYPICAL APPLICATIOU S ±250V Common Mode Range Difference Amplifier (AV = 1) R1 R5 1M 975k –IN 3 4 1 R202k 3V TO 18V 2R56k 50k OCMPTRIORNAL TRIM 2 7 2 6 R3 OUT 1M 3 COMMON +IN 7 6 MODE 4 INPUT R4 ±250V 19.608k OV TO–18V 5 R1 TO R6: VISHAY 444 ACCUTRACT THIN FILM SIP NETWORK X :VISHAY 444 PIN NUMBERS VISHAY INTERTECHNOLOGY, INC. 63 LINCOLN HIGHWAY MALVERN, PA 19355 COMMON MODE REJECTION RATIO =74dB (RESISTOR LIMITED) WITH OPTIONAL TRIM =108dB OUTPUT OFFSET (TRIMMABLE TO ZERO) =500µV OUTPUT OFFSET DRIFT =25µV/°C INPUT RESISTANCE =1M COMMON MODE RANGE =±250V, V+ = 6.2V TO 18V, V– = –4.7V TO –18V =±100V, V++≥ 3.2V, V– ≤ –1.8V =100V, –13V, V+ ≥ 3.2V, V– = 0V LT1077 • TA04 Two Terminal Current Source Half-Wave Rectifier 2M 3.6V TO 40V 2 7 3V – 1M INPUT – 6 LT1077 LT1077 OUTPUT 3 + 1M 4 + V0MIN = 6mV IS + NO DISTORTION TO 100Hz 750k R1 VR1 1.8V 1.8V – –1.8V 0 LT1034 1.2V LT1077 • TA06 LT1077 • TA05 IO RL IO = VRR11 + IS 1.230V = + 50µA R1 MINIMUM CURRENT = 50µA (R1 → ∞) MAXIMUM CURRENT = 10.3mA (R1 = 120Ω) 1077fa 12

LT1077 SIW PLIFIED SCHEW ATIC – V k k 0 0 0 0 7 7 2.5k 2 J1 9 1 5 4 Q Q 1 4 Q k 1 Q40 Q48 9. Q43 Q46 –V Q5155 5.35k +V +V Q44 Q42 Q k 11.5 Q45 Q53 2 Q47 Q50 8 5k 54 1 150k Q33 +V Q3 LT1077 • S01 Q 1 Ω OUT 10k 30Ω 35 30 Q36 Q 6 2 Q k 3 3.6k Q3013 Q25 C42.9k4pF Q31 Q23 Q34 1.35k Q32 Q37 C340pF Q20 k 1.3 Q19 5 Q1 18 Q 7 9 1 5.6k Q2 C150pF C52.5pF Q10 Q Q14 Q24 Q4 8.6k Q8 6.2k 2.2k Q16 Q3 Q27 Q28 +V Q39 7 Q12 4 1 Q 6.2k L 2F L Cp U 5 N 17 700Ω 9k Q6 Q1 Q2 Q22 Q9 Ω 700 9k Q1 Q21 5 Q NULL 600Ω 600Ω N N –I +I 1077fa 13

LT1077 PACKAGE DESCRIPTIOU H Package 8-Lead TO-5 Metal Can (.200 Inch PCD) (Reference LTC DWG # 05-08-1320) .335 – .370 .027 – .045 (8.509 – 9.398) (0.686 – 1.143) DIA 45°TYP PIN 1 .305 – .335 .028 – .034 (7.747 – 8.509) (0.711 – 0.864) .040 (1.016) .050 .200 MAX (1.270) .165 – .185 (5.080) MAX (4.191 – 4.699) TYP REFERENCE SEATING PLANE PLANE GPLAAUNGEE .500 – .750 .110 – .160 (12.700 – 19.050) (2.794 – 4.064) .010 – .045* INSULATING (0.254 – 1.143) STANDOFF .016 – .021** *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE (0.406 – 0.533) AND THE SEATING PLANE .016 – .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 – 0.610) H8(TO-5) 0.200 PCD 0801 J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION .405 (4 PLCS) (10.287) .005 MAX (0.127) MIN 8 7 6 5 .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .025 .220 – .310 .045 – .068 (0.635) (5.588 – 7.874) (1.143 – 1.650) RAD TYP FULL LEAD OPTION 1 2 3 4 .200 .300 BSC (5.080) (7.62 BSC) MAX .015 – .060 (0.381 – 1.524) .008 – .018 0° – 15° (0.203 – 0.457) .045 – .065 .125 NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE (1.143 – 1.651) OR TIN PLATE LEADS 3.175 MIN .014 – .026 .100 (0.360 – 0.660) (2.54) BSC J8 0801 OBSOLETE PACKAGES 1077fa 14

LT1077 PACKAGE DESCRIPTIOU N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 .255 ± .015* (6.477 ± 0.381) 1 2 3 4 .300 – .325 .045 – .065 .130 ± .005 (7.620 – 8.255) (1.143 – 1.651) (3.302 ± 0.127) .065 (1.651) .009 – .015 TYP (0.229 – 0.381) .125 (3.175) .020 +.035 MIN (0.508) .325–.015 .100 .018 ± .003 MIN ( +0.889) 8.255 (2.54) (0.457 ± 0.076) –0.381 BSC N8 0502 NOTE: INCHES 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) 1077fa 15 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LT1077 PACKAGE DESCRIPTIOU 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 N N .245 MIN .160 ±.005 .150 – .157 .228 – .244 (3.810 – 3.988) (5.791 – 6.197) NOTE 3 1 2 3 N/2 N/2 .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT 1 2 3 4 .010 – .020 × 45°(cid:31) .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 0502 1077fa 16 Linear Technology Corporation LW/TP 1002 1K 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 1989

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: LT1077IN8#PBF LT1077ACN8 LT1077IS8 LT1077ACN8#PBF LT1077IS8#TRPBF LT1077CN8 LT1077AIN8 LT1077S8#TR LT1077S8 LT1077CN8#PBF LT1077S8#PBF LT1077S8#TRPBF LT1077AIN8#PBF LT1077IS8#PBF LT1077IN8 LT1077IS8#TR