LT1077AMH

LT1077 Micropower, Single Supply, Precision Op Amp FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO ■ 60µA Max Supply Current 40µV Max Offset Voltage 350pA Max Offset Current 0.5µVP-P 0.1Hz to 10Hz Voltage Noise 2.5pAP-P 0.1Hz to 10Hz Current Noise O.4µV/°C Offset Voltage Drift 250kHz Gain-Bandwidth Product 0.12V/µs Slew Rate Single Supply Operation Input Voltage Range Includes Ground Output Swings to Ground while Sinking Current No Pull-Down Resistors are Needed Output Sources and Sinks 5mA Load Current The LT®1077 is a micropower precision operational amplifier optimized for single supply operation at 5V. In addition, ±15V specifications are provided. Micropower performance of competing devices is achieved at the expense of seriously degrading precision, noise, speed, and output drive specifications. The LT1077 reduces supply current without sacrificing other parameters. The offset voltage achieved is the lowest of any micropower op amp. Offset current, voltage and current noise, slew rate and gain-bandwidth product are all two to ten times better than on previous micropower op amps. The 1/f corner of the voltage noise spectrum is at 0.7Hz. This results in low frequency (0.1Hz to 10Hz) noise performance which can only be found on devices with an order of magnitude higher supply current. The LT1077 is completely plug-in compatible (including nulling) with all industry standard precision op amps. Thus, it can replace these precision op amps in many applications without sacrificing performance, yet with significant power savings. The LT1077 can be operated from one lithium cell or two Ni-Cad batteries. The input range goes below ground. The all-NPN output stage swings to ground while sinking current—no pull-down resistors are needed. For dual and quad op amps with similar specifications please see the LT1078/LT1079 datasheet. APPLICATIO S ■ ■ ■ ■ ■ Replaces OP-07, OP-77, AD707, LT1001, LT1O12 at 10 to 60 Times Lower Power Battery or Solar Powered Systems 4mA to 2OmA Current Loops Two Terminal Current Source Megaohm Source Resistance Difference Amplifier , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO 3.6V TO 9V 2 Distribution of Input Offset Voltage 35 30 PERCENT OF UNITS Self Buffered Micropower Reference 7 LT1077 3 6 OUTPUT 1.230V ±1.2% MAX SUPPLY CURRENT = 60µA MAX SOURCES UP TO 10mA LOAD REGULATION = 30µV/mA TEMPERATURE DRIFT = 12ppm/°C LT1077 • TA01 25 20 15 10 5 – + 4 LT1034 1.2V 0.1µF 750k 0 0 –40 –30 –20 –10 10 20 30 40 INPUT OFFSET VOLTAGE (µV) LT1077 • TA02 1077fa U VS = 5V, 0V TA = 25°C 1072 UNITS TESTED IN H, J8, N8 PACKAGES U U 1 LT1077 ABSOLUTE AXI U RATI GS (Note 1) Operating Temperature Range LT1077AM/LT1077M (OBSOLETE).... – 55°C to 125°C LT1077AI/LT1077I.............................. – 40°C to 85°C LT1077AC/LT1077C/LT1077S8 ............... 0°C to 70°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C Supply Voltage ...................................................... ± 22V Differential Input Voltage ....................................... ±30V Input Voltage ............... Equal to Positive Supply Voltage Input Voltage ............5V Below Negative Supply Voltage Output Short-Circuit Duration .......................... Indefinite PACKAGE/ORDER I FOR ATIO TOP VIEW VOS TRIM 8 VOS TRIM 1 A –IN 2 +IN 3 – ++ B – 6 OUT 5 NC 7 V+ VOS TRIM 1 –IN 2 +IN 3 V – TOP VIEW 8 7 6 5 VOS TRIM V+ OUT NC VOS TRIM 1 –IN 2 +IN 3 V– 4 4 V– H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 150°C, θJA = 150°C/W, θJC = 45°C/W 4 J8 PACKAGE 8-LEAD CERDIP TJMAX = 150°C, θJA = 100°C/W ORDER PART NUMBER LT1077AMH LT1077MH LT1077ACH LT1077CH ORDER PART NUMBER LT1077AMJ8 LT1077MJ8 LT1077ACJ8 LT1077CJ8 OBSOLETE PACKAGE Consider the N8 or S8 Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS SYMBOL VOS ∆VOS ∆Time IOS IB en PARAMETER Input Offset Voltage LT1077S8 Long Term Input Offset Voltage Stability Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density in Input Noise Current CONDITIONS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless noted. LT1077AM/AI/AC MIN TYP MAX 9 0.4 0.06 7 0.35 9 1.1 43 35 4.5 40 MIN LT1077M/I/C/S8 TYP MAX 10 12 0.4 0.06 7 0.5 28 27 2.5 0.45 11 60 150 UNITS µV µV µV/Mo nA nA µVP-P nV/√Hz nV/√Hz pAP-P 1077fa 0.1Hz to 10Hz (Note3) fO = 10Hz (Note 3) fO = 1000Hz (Note3) 0.1Hz to 10Hz (Note3) 2 U U W WW U W TOP VIEW 8 7 6 5 VOS TRIM V+ OUT NC N8 PACKAGE 8-LEAD PDIP TJMAX = 100°C, θJA = 130°C/W S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 190°C/W ORDER PART NUMBER LT1077S8 LT1077IS8 LT1077AIN8 LT1077IN8 LT1077ACN8 LT1077CN8 S8 PART MARKING 1077 1077I LT1077 • POI01 0.5 28 27 2.5 LT1077 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Input Noise Current Density Input Resistance Differential Mode Common Mode Input Voltage Range CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing VCM = 0V to 3.5V VS = 2.3V to 12V CONDITIONS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless noted. LT1077AM/AI/AC MIN TYP MAX 0.065 0.02 350 3.5 0 97 102 300 250 700 6 3.8 – 0.3 106 118 1000 1000 3.5 0.7 90 4.4 3.9 0.08 230 48 60 ± 500 2.3 6 1.1 130 4.2 3.5 0.05 0.11 MIN LT1077M/I/C/S8 TYP MAX 0.065 0.02 270 3.5 0 94 100 240 200 700 6 3.8 – 0.3 105 117 1000 1000 3.5 0.7 90 4.4 3.9 0.08 230 48 ± 900 2.2 2.3 68 6 1.1 130 UNITS pA/√Hz pA/√Hz MΩ GΩ V V dB dB V/mV V/mV mV mV mV V V V/µs kHz µA µV V fO = 10Hz (Note 3) fO = 1000Hz (Note 4) VO = 0.03V to 4V, No Load VO = 0.03V to 3.5V, RL = 50k Output Low, No Load Output Low, 2k to GND Output Low, lSINK = 100µA Output High, No Load Output High, 2k to GND (Note 2) fO ≤ 20kHz = 10k, Wiper to V+ 4.2 3.5 0.05 SR GBW IS Slew Rate Gain Bandwidth Product Supply Current Offset Adjustment Range Minimum Supply Voltage Rpot ± 500 ± 900 2.2 (Note 5) 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. SYMBOL VOS ∆VOS/∆T IOS IB CMRR PSRR AVOL PARAMETER Input Offset Voltage Input Offset Voltage Drift Input Offset Current Input Bias Current Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing VCM = 0.05V to 3.2V VS = 3.1V to 12V VO = 0.05V to 3.5V, RL = 50k Output Low, No Load Output Low, ISINK = 100µA Output High, No Load Output High, 2k to GND LT1077IS8 (Note 6) CONDITIONS ● ● ● ● ● ● ● ● ● ● ● ● MIN LT1077AM/AI TYP MAX 50 200 MIN LT1077M/I TYP MAX 60 1 260 2.5 0.80 13 UNITS µV µV/°C nA nA dB dB V/mV 0.08 8 92 98 120 104 114 600 4.5 120 4.2 3.7 54 0.60 11 88 94 100 8 170 3.9 3 80 0.08 8 103 113 600 4.5 120 4.2 3.7 54 8 170 3.9 3 mV mV V V µA IS Supply Current 90 1077fa 3 LT1077 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. SYMBOL VOS ∆VOS/∆T IOS IB CMRR PSRR AVOL PARAMETER Input Offset Voltage LT1077S8 Input Offset Voltage Drift Input Offset Current Input Bias Current Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing VCM = 0V to 3.4V VS = 2.6V to 12V VO = 0.05V to 3.5V, RL = 50k Output Low, No Load Output Low, ISINK = 100µA Output High, No Load Output High, 2k to GND (Note 6) LT1077S8 (Note 6) CONDITIONS ● ● ● ELECTRICAL CHARACTERISTICS MIN LT1077AC TYP MAX 30 0.4 0.07 7 110 1.6 0.45 10 MIN LT1077C/S8 TYP MAX 35 40 0.5 0.7 0.07 7 150 280 2.0 3.0 0.60 12 UNITS µV µV µV/°C µV/°C nA nA dB dB V/mV ● ● ● ● ● ● ● ● ● ● 94 100 180 105 116 800 4.0 100 4.3 3.8 52 7 150 90 97 150 104 115 800 4.0 100 4.3 3.8 52 7 150 4.1 3.3 4.1 3.3 70 mV mV V V µA IS Supply Current 80 VS = ±15V, TA = 25°C unless noted. SYMBOL VOS IOS IB PARAMETER Input Offset Voltage LT1077S8 Input Offset Current Input Bias Current Input Voltage Range CMRR PSRR AVOL VOUT SR IS Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Slew Rate Supply Current VCM = 13.5V to –15V VS = 5V, 0V to ±18V VO = ±10V, RL = 50k VO = ±10V, RL = 2k RL = 50k RL = 2k 13.5 – 15.0 100 106 1000 400 ±13.0 ±11.0 0.07 0.06 7 13.8 – 15.3 109 122 8000 1500 ±14.0 ±13.2 0.12 56 75 0.35 9 13.5 – 15.0 97 103 800 300 ±13.0 ±11.0 0.07 CONDITIONS LT1077AM/AI/AC MIN TYP MAX 20 150 MIN LT1077M/I/C/S8 TYP MAX 25 30 0.06 7 13.8 – 15.3 108 120 8000 1500 ±14.0 ±13.2 0.12 56 85 200 300 0.45 11 UNITS µV µV nA nA V V dB dB V/mV V/mV V V V/µs µA 1077fa 4 LT1077 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. SYMBOL VOS ∆VOS/∆T IOS IB AVOL CMRR PSRR PARAMETER Input Offset Voltage Input Offset Voltage Drift Input Offset Current Input Bias Current Large-Signal Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Maximum Output Voltage Swing IS Supply Current VO = ±10V, RL = 5k VCM = 13V, –14.9V VS = 5V, 0V to ±18V RL = 5k LT1077IS8 (Note 6) CONDITIONS ● ● ● ● ● ● ● ● ● ELECTRICAL CHARACTERISTICS MIN LT1077AM/AI TYP MAX 60 330 MIN LT1077M/I TYP MAX 75 1.1 450 3 0.80 13 UNITS µV µV/°C nA nA V/mV dB dB V 0.08 8 300 94 100 ± 11 1000 107 118 ± 13.5 60 0.60 11 250 90 97 ± 11 95 0.08 8 1000 106 116 ± 13.5 60 105 µA The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C. VS = ±15V unless otherwise noted. SYMBOL VOS ∆VOS/∆T IOS IB AVOL CMRR PSRR PARAMETER Input Offset Voltage LT1077S8 Input Offset Voltage Drift Input Offset Current Input Bias Current Large-Signal Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Maximum Output Voltage Swing IS Supply Current VO = ± 10V, RL = 5k VCM = 13V, –15V VS = 5V, 0V to ±18V RL = 5k (Note 6) LT1077S8 (Note 6) CONDITIONS ● ● ● ● ● ● ● ● ● ● ● MIN LT1077AC TYP MAX 40 0.4 0.07 7 230 1.8 0.45 10 MIN LT1077C/S8 TYP MAX 50 65 0.5 0.8 0.07 7 320 450 2.5 3.5 0.60 12 UNITS µV µV µV/°C µV/°C nA nA V/mV dB dB V 500 97 103 ± 11 2000 108 120 ± 13.6 59 85 400 94 100 ± 11 2000 107 118 ± 13.6 59 95 µA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impared. Note 2: Slew rate at 5V, 0V is guaranteed by inference from the slew rate measurement at ± 15V. Note 3: This parameter is tested on a sample basis only. All noise parameters are tested with VS = ± 2.5V, VO = 0V. Note 4: This parameter is guaranteed by design and is not tested. Note 5: Power supply rejection ratio is measured at the minimum supply voltage. The op amps actually work at 1.8V supply but with a typical offset skew of – 300µV. Note 6: This parameter is not 100% tested. 1077fa 5 LT1077 TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Temperature OFFSET CURRENT (pA) 60 SUPPLY CURRENT (µA) VS = ±15V VS = 5V, 0V 50 50 INPUT BIAS CURRENT (nA) BIAS CURRENT (nA) 40 –50 –25 50 25 75 0 TEMPERATURE (˚C) 0.1Hz to 10Hz Noise VS = ± 2.5V TA = 2.5°C NOISE VOLTAGE (0.4µV/DIV) NOISE VOLTAGE (0.4µV/DIV) VOLTAGE NOISE DENSITY (nV/√Hz) CURRNET NOISE DENSITY (fA/√Hz) 0.4µV 0 2 6 4 TIME (SECONDS) 10Hz Voltage Noise Distribution 35 30 VS = ± 2.5V TA = 2.5°C PERCENT OF UNITS 30 PERCENT OF UNITS 20 15 10 5 0 25 35 30 VOLTAGE NOISE DENSITY (nV/√Hz) 40 20 PERCENT OF UNITS 25 6 UW 100 8 Input Bias and Offset Currents vs Temperature –1 Input Bias Currents vs Common Mode Voltage VS = 5V, 0V 100 75 VS = 5V, 0V TO ±15V IOS –3 –5 –7 TA = 25°C TA = 55°C –6 IB –7 TA = 125°C –9 –11 –13 –1 125 –8 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 0 1 2 3 COMMON MODE VOLTAGE (V) 4 LT1077 • TPC03 LT1077 • TPC01 LT1077 • TPC02 0.01Hz to 10Hz Noise VS = ± 2.5V TA = 2.5°C 1000 Noise Spectrum VS = ± 2.5V TA = 25°C (AT VS = ±15V VOLTAGE NOISE IS 4% LESS CURRENT NOISE IS UNCHANGED 300 CURRENT NOISE 100 VOLTAGE NOISE 30 1/f CORNER 0.7Hz 10 0.1 1 10 100 FREQUENCY (Hz) 1000 LT1077 • TPC06 10 0 20 60 40 TIME (SECONDS) 80 100 LT1077 • TPC04 LT1077 • TPC05 Distribution of Offset Voltage Drift with Temperature (In All Packages) VS = 5V, 0V VCM = 0.1V Distribution of Input Offset Voltage in Small Outline (S8) Package 70 60 50 40 30 20 10 VS = 5V, 0V TA = 25°C 456 UNITS TESTED 400 UNITS TESTED (100 IN EACH PACKAGE) 10 0 –1.0 1.0 2.0 0 –2.0 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (nV/°C) LT1077 • TPC08 0 –150 –120 –90 –60 –30 0 30 60 90 120 150 INPUT OFFSET VOLTAGE (µV) LT1077 • TPC09 LT1077 • TPC07 1077fa LT1077 TYPICAL PERFOR A CE CHARACTERISTICS Voltage Gain vs Frequency 140 TA = 25°C 120 30 VOLTAGE GAIN (dB) 80 60 40 20 0 –20 0.01 0.1 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) LT1077 • TPC10 10 GAIN PHASE MARGIN 54° ±15V 5V, 0V ±15V 140 160 180 200 OVERSHOOT (%) VS = ±15V VOLTAGE GAIN (dB) 100 20 5V, 0V 120 PHASE SHIFT (DEGREES) VS = 5V, 0V Slew Rate, Gain Bandwidth Product and Phase Margin vs Temperature SLEW RATE (V/µs) 0.14 0.12 0.10 0.08 0.06 fO = 20kHz SLEW ±15V SLEW 5V, 0V 80 φM ± 15V φM ± 5V, 0V 70 60 50 GBW ± 15V 40 PHASE MARGIN (DEGREES) 1V/DIV 0V 5V/DIV GAIN BANDWIDTH PRODUCT (kHz) 260 240 220 200 180 –50 –25 GBW 5V, 0V 25 50 0 75 TEMPERATURE (°C) 100 Small-Signal Transient Response VS = 5V, 0V 20mV/DIV 20mV/DIV 20mV/DIV AV = 1 10µs/DIV CL = 15pF INPUT 50mV TO 150mV UW LT1077 • TPC13 Gain, Phase vs Frequency PHASE MARGIN 66° PHASE Capacitive Load Handling 120 100 100 80 VS = 5V, 0V TA = 25°C AV = 1 60 40 20 0 10 100 1000 CAPACITIVE LOAD (pF) 10,000 LT1077 • TPC12 0 TA = 25°C CL = 20pF –10 10k 30k 100k 300k FREQUENCY (Hz) AV = 5 AV = 10 1M LT1077 • TPC11 Large-Signal Transient Response VS = 5V, 0V Large-Signal Transient Response VS = ±15V 0V 100µs/DIV 50µs/DIV AV = 1 NO LOAD INPUT PULSE 0V TO 3.8V AV = 1 NO LOAD 125 Small-Signal Transient Response VS = ± 2.5V Small-Signal Transient Response VS = ± 15V 0.1V 0V 0V AV = 1 CL = 15pF 10µs/DIV AV = 1 CL = 15pF 10µs/DIV 1077fa 7 LT1077 TYPICAL PERFOR A CE CHARACTERISTICS Minimum Supply Voltage 100 0 125°C –100 –200 –300 –400 –500 0 2 3 1 POSITIVE SUPPLY VOLTAGE (V) LT1077 • TPC19 CHANGE IN OFFSET VOLTAGE (µV) V – = 0V – 0.1 ≤ VCM ≤ 0.4V 70°C INPUT OFFSET VOLTAGE (µV) VOLTAGE GAIN (V/V) NON FUNCTIONAL 0°C 25°C Output Saturation vs Temperature vs Sink Current 1000 VS = 5V, 0V ISINK = 2mA OUTPUT VOLTAGE SWING (V) ISINK = 1mA SHORT-CIRCUIT CURRENT (mA) SINKING SOURCING SATURATION VOLTAGE (mV) 100 ISINK = 100µA ISINK = 10µA 10 ISINK = 1µA NO LOAD RL = 5k TO GROUND 0 –50 –25 0 25 50 75 TEMPERATURE (°C) LT1077 • TPC22 Common Mode Range vs Temperature V + = 2.5V TO 18V V – = 0V TO –18V PEAK-TO-PEAK OUTPUT SWING, VS = ±15V (V) V+ V+ – 1 COMMON MODE RANGE (V) OUTPUT IMPEDANCE (Ω) V+ – 2 V– + 1 V– V– – 1 – 50 –25 50 25 0 75 TEMPERATURE (°C) 8 UW –55°C 100 Warm-Up Drift 0.8 VS = ±15V TA = 25°C Voltage Gain vs Load Resistance 10M 1. 25°C 2. –55°C VS = ± 15V 3. 125°C 1 2 3 4 5 6 WARM UP DRIFT 0.6 AT VS = 5V, 0V IS IMMEASURABLY LOW 0.4 1M 0.2 0 0 1 2 3 LT1077 • TPC20 100k 100 4. –55°C 5. 25°C VS = 5V, 0V 6. 125°C 10k 1k 100k LOAD RESISTANCE TO GROUND (Ω) 1M TIME AFTER POWER ON (MINUTES) LT1077 • TPC21 Output Voltage Swing vs Load Current V+ 125°C V+ – 1 V+ – 2 –55°C 25°C Short-Circuit Current vs Time 40 30 20 10 TA = 125°C, VS = 5V, 0V 0 –10 TA = 125°C, VS = ±15V –20 –30 –55°C TA = 25°C, VS = 5V, 0V TA = 25°C, VS = ±15V TA = 125°C, VS = ±15V V– + 2 V– + 1 V– 0.01 25°C 125°C TA = 25°C, VS = ±15V –40 10 125 0.1 1 SOURCING OR SINKING LOAD CURRENT (mA) LT1077 • TPC23 1 2 3 0 TIME FROM OUTPUT SHORT TO GROUND (MINUTES) LT1077 • TPC24 Undistorted Output Swing vs Frequency 30 Closed Loop Output Impedance PEAK-TO-PEAK OUTPUT SIWNG, VS = 5V, 0V (V) 1k TA = 25°C LOAD RL, TO GROUND VS = 5V, 0V, RL ≥ 100k 5 4 3 2 20 VS = 5V, 0V RL ≥ 1k 10 VS = ±15V RL = 30k 0 100 1k 10k FREQUENCY (Hz) 100 AV = 100 VS = ±15V RL ≥ 100k 10 AV = 1 AV = 10 1 1 0 100k LT1077 • TPC26 0.1 10 10k 100 1k FREQUENCY (Hz) 100k LT1077 • TPC27 100 125 LT1077 • TPC25 1077fa LT1077 TYPICAL PERFOR A CE CHARACTERISTICS Common Mode Rejection Ratio vs Frequency 120 120 COMMON MODE REJECTION RATIO (dB) POWER SUPPLY REJECTION RATIO (dB) 100 VS = ±15V 80 60 40 20 0 10 100 1k 10k FREQUENCY (Hz) 100k 1M VS = 5V, 0V APPLICATIO S I FOR ATIO The LT1077 is fully specified with V+ = 5V, V – = 0V, VCM = 0.1V. This set of operating conditions appears to be the most representative for battery powered micropower circuits. Offset voltage is internally trimmed to a minimum value at these supply voltages. When 9V or 3V batteries, or ± 2.5V dual supplies are used, bias and offset current changes will be minimal. Offset voltage changes will be just a few microvolts as given by the PSRR and CMRR specifications. For example, if PSRR = 114dB ( = 2µV/V), at 9V the offset voltage change will be 8µV. Similarly, VS ±2.5V, VCM = 0 is equivalent to a common mode voltage change of 2.4V or a V OS c hange of 7 µV if CMRR = 110dB (3µV/V). A full set of specifications is also provided at ±15V supply voltages for comparison with other devices and for completeness. The LT1077 is pin compatible to, and directly replaces, such precision op amps as the OP-07, OP-77, AD7O7 and LT1001 with 30 to 60 times savings in supply current. The LT1077 is also a direct plug-in replacement for LT1012 and OP-97 devices with 10 times lower dissipation. Compatibility includes externally nulling the offset voltage, as all of the devices above are trimmed with a potentiometer between Pins 1 and 8 and the wiper tied to V+. U W UW Power Supply Rejection Ratio vs Frequency TA = 25°C 100 80 60 NEGATIVE SUPPLY 40 20 POSITIVE SUPPLY 0 0.1 VS = ± 2.5V + 1VP-P SINE WAVE TA = 25°C 1 10 100 1k 10k FREQUENCY (Hz) 100k LT1077 • TPC29 LT1077 • TPC28 UU The LT1077 replaces and upgrades such micropower op amps as the OP-20, LM4250, and OP-90, provided that the external nulling circuitry (and set resistor in the case of the LM4250) are removed. Since the offset voltage of the LT1077 is extremely low, nulling will be unnecessary in most applications. Single Supply Operation The LT1077 is fully specified for single supply operation, (i.e., when the negative supply is 0V). Input common mode range goes below ground and the output swings within a few millivolts of ground while sinking current. All competing micropower op amps either cannot swing to within 600mV of ground (OP-20, OP-220, OP-420) or need a pull-down resistor connected to the output to swing to ground (OP-90, OP-290, OP-490, HA5141/42/ 44). This difference is critical because in many applications these competing devices cannot be operated as micropower op amps and swing to ground simultaneously. Consider the difference amplifiers shown in Typical Applications as an example. When the common mode signal is high and the output low, the amplifier has to sink current. In the gain of 10 circuit, the competing devices require a 30k pull-down resistor at the output to handle the specified signals. (The LT1077 does not need pull-down 1077fa 9 LT1077 APPLICATIO S I FOR ATIO resistors.) When the output is high the pull-down resistor draws 80µA which dominates the micropower current budget. This situation is much worse in the gain of one circuit with V –=0V. At 100V common mode, the output has to sink 2µA. At a minimum output voltage of 20mV competing devices require a 10k pull-down resistor. As the output now swings to 10V, this resistor draws 1mA of current. Since the output of the LT1077 cannot go exactly to ground, but can only approach ground to within a few millivolts, care should be exercised to ensure that the output is not saturated. For example, a 1mV input signal will cause the amplifier to set up in its linear region in the gain 100 configuration shown below; however, it is not enough to make the amplifier function properly in the voltage follower mode. Gain 100 Amplifier 5V R 99R 100mV 1mV Voltage Follower 5V – + – 1mV + Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V) 4V 2V 0 4V 2V 0 6VP-P INPUT –1.0 TO 5.0V 1ms/DIV OP-90 1ms/DIV EXHIBITS OUTPUT PHASE REVERSAL 10 U Single supply operation can also create difficulties at the input. The driving signal can fall below 0V—inadvertently or on a transient basis. If the input is more than a few hundred millivolts below ground, two distinct problems can occur on previous single supply designs, such as the LM124, LM158, OP-20, OP-21, OP-220, OP-221, OP-420 (a and b), OP-90/290/490 (b only): a) When the input is more than a diode drop below ground, unlimited current will flow from the substrate (V – terminal) to the input (this can destroy the unit). On the LT1077, resistors in series with the input protect the device even when the input is 5V below ground. b) When the input is more than 400mV below ground (at 25°C), the input stage saturates and phase reversal occurs at the output (this can cause lock-up in servo systems). Due to a unique phase reversal protection circuitry, the LT1077’s output does not reverse, as illustrated below, even when the input is at – 1.0V. OUTPUT SATURATED ≈ 3.5mV LT1077 • AI01 W UU 4V 2V 0 LT1077 1ms/DIV NO PHASE REVERSAL 1077fa LT1077 APPLICATIO S I FOR ATIO Comparator Applications The single supply operation of the LT1077 and its ability to swing close to ground while sinking current, Comparator Rise Response Time to 10mV, 5mV, 2mV Overdrive OUTPUT (V) 4 2 0 0 –100 VS = 5V, 0V 200µs/DIV OUTPUT (V) INPUT (mV) INPUT (mV) TYPICAL APPLICATIO S Megaohm Input Impedance Gain of 10 Difference Amplifier 10M – INPUT 1M + 1M 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 U lends itself to use as a precision comparator with TTL compatible output. Comparator Fall Response Time to 10mV, 5mV, 2mV Overdrive 4 2 0 100 0 VS = 5V, 0V 200µs/DIV W U UU 2 3V 7 6 OUTPUT 0.005 TO 2.4V 3 4 1077fa 11 LT1077 TYPICAL APPLICATIO S ± 250V Common Mode Range Difference Amplifier (AV = 1) R1 1M – IN 3 R2 20k 2 R3 1M + IN 7 6 4 3V TO 18V 7 6 3 4 R4 19.608k 5 OV TO –18V 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 LT1077 • TA04 = 100V, –13V, V + ≥ 3.2V, V – = 0V R6 25k 2 OUT R5 975k 1 50k OPTIONAL CMRR TRIM COMMON MODE INPUT ± 250V Two Terminal Current Source 3.6V TO 40V 2 – + 7 LT1077 6 3 4 IS + VR1 – 750k R1 LT1034 1.2V LT1077 • TA05 IO VR1 + IS R1 1.230V + 50µA R1 RL IO = = MINIMUM CURRENT = 50µA (R1 → ∞) MAXIMUM CURRENT = 10.3mA (R1 = 120Ω) 12 U Half-Wave Rectifier 2M 1M INPUT 1M 3V – LT1077 OUTPUT V0MIN = 6mV NO DISTORTION TO 100Hz 1.8V –1.8V 0 LT1077 • TA06 + 1.8V 1077fa V+ 700Ω 2.2k 5.6k 1.3k 3.6k 5k 11.5k 12.5k Q53 2 Q52 Q54 1 1 Q16 Q14 Q15 Q32 Q47 Q37 Q3 Q24 Q30 C1 50pF 1 3 Q25 Q35 V+ Q26 2.9k 30Ω Q44 C4 4pF C5 2.5pF Q27 OUT Q31 J1 Q36 Q33 Q50 Q39 Q23 V+ Q20 10k Q34 1.35k 6.2k 6.2k 30Ω Q38 5.35k Q45 Q51 Q55 Q43 9.1k Q42 Q48 Q49 Q28 Q18 V+ Q19 C3 40pF 150k 3k Q40 Q41 8.6k Q12 4 1 Q4 Q29 V– Q46 700Ω NULL NULL SI PLIFIED SCHE ATIC W LT1077 Q5 Q6 Q1 600Ω Q1 –IN Q21 600Ω Q2 +IN Q22 Q9 Q10 Q17 Q7 Q8 700k C2 175pF 700k V– LT1077 • S01 W 9k 9k 13 1077fa LT1077 PACKAGE DESCRIPTIO .335 – .370 (8.509 – 9.398) DIA .305 – .335 (7.747 – 8.509) .040 (1.016) MAX .050 (1.270) MAX GAUGE PLANE .165 – .185 (4.191 – 4.699) SEATING PLANE .010 – .045* (0.254 – 1.143) .016 – .021** (0.406 – 0.533) CORNER LEADS OPTION (4 PLCS) .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .300 BSC (7.62 BSC) .008 – .018 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS 14 U H Package 8-Lead TO-5 Metal Can (.200 Inch PCD) (Reference LTC DWG # 05-08-1320) 45°TYP .028 – .034 (0.711 – 0.864) .200 (5.080) TYP .027 – .045 (0.686 – 1.143) PIN 1 REFERENCE PLANE .500 – .750 (12.700 – 19.050) .110 – .160 (2.794 – 4.064) INSULATING STANDOFF *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE 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) .405 (10.287) MAX 8 7 6 5 .005 (0.127) MIN .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .025 (0.635) RAD TYP 1 2 3 .220 – .310 (5.588 – 7.874) 4 .200 (5.080) MAX .015 – .060 (0.381 – 1.524) 0° – 15° .045 – .065 (1.143 – 1.651) .014 – .026 (0.360 – 0.660) .100 (2.54) BSC .125 3.175 MIN J8 0801 OBSOLETE PACKAGES 1077fa LT1077 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .009 – .015 (0.229 – 0.381) +.035 .325 –.015 ( 8.255 +0.889 –0.381 ) INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) NOTE: 1. DIMENSIONS ARE 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U 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 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .125 (3.175) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) N8 0502 .100 (2.54) BSC 1077fa 15 LT1077 PACKAGE DESCRIPTIO .050 BSC 8 N N .245 MIN .160 ±.005 .228 – .244 (5.791 – 6.197) 1 2 3 N/2 .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN INCHES (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) 16 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● U S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .045 ±.005 .189 – .197 (4.801 – 5.004) NOTE 3 7 6 5 .150 – .157 (3.810 – 3.988) NOTE 3 N/2 1 2 3 4 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) .014 – .019 (0.355 – 0.483) TYP .050 (1.270) BSC SO8 0502 1077fa LW/TP 1002 1K REV A • PRINTED IN USA www.linear.com  LINEAR TECHNOLOGY CORPORATION 1989