LT2079CS

LT2079CS LINEAR_DIMENSIONS | Alldatasheet

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Micropower, Dual and Quad, Single Supply, Precision Op Amps

FEATURES

n Supply Current per Amplifier: 50µA Max n Offset Voltage: 70µV Max n Offset Current: 250pA Max n Voltage Noise: 0.6µVP-P, 0.1Hz to 10Hz n Current Noise: 3pAP-P, 0.1Hz to 10Hz n Offset Voltage Drift: 0.4µV/°C n Gain Bandwidth Product: 200kHz n Slew Rate: 0.07V/µs n Single Supply Operation Input Voltage Range Includes Ground Output Swings to Ground while Sinking Current No Pull-Down Resistors Needed n Output Sources and Sinks 5mA Load Current n SO Package with Standard Pinout DESCRIPTIONU The LT 2078 is a micropower dual op amp in 8-pin small outline, standard surface mount package, and LT2079 is a micropower quad op amp offered in the standard 14-pin surface mount package. Both devices are optimized for single supply operation at 5V. ±15V specifications are also provided. Micropower performance of competing devices is achieved at the expense of seriously degrading precision, noise, speed and output drive specifications. The design effort of the LT2078/LT2079 was concentrated on reducing sup- ply current without sacrificing other parameters. The offset voltage achieved is the lowest on any dual or quad nonchopper stabilized op amp––micropower or other- wise. 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. Both the LT2078/LT2079 can be operated from a single supply (as low as one lithium cell or two NiCd batteries). The input range goes below ground. The all NPN output stage swings to within a few millivolts of ground while sinking current––no power consuming pull-down resis- tors are needed. For applications requiring DIP packages refer to the LT1078/LT1079. , LTC and LT are registered trademarks of Linear Technology Corporation. n Battery or Solar-Powered Systems Portable Instrumentation Remote Sensor Amplifier Satellite Circuitry n Micropower Sample-and-Hold n Thermocouple Amplifier n Micropower Filters TYPICAL APPLICATIONU Single Battery, Micropower, Gain = 100, Instrumentation Amplifier Distribution of Input Offset Voltage INPUT OFFSET VOLTAGE (µV) –120 NUMBER OF OP AMPS 0 80 2078/79 • TA02 –80 –40 40 800 700 600 500 400 300 200 100 120 VS = 5V, 0V

5000 OP AMPS

–INPUT 1M 2 1 6 A 1/2 LT2078 10.1k 1M 10.1k NONINVERTING +INPUT B 1/2 LT2078 (Li-Ion) OUT TYPICAL PERFORMANCE INPUT OFFSET VOLTAGE = 40µV INPUT OFFSET CURRENT = 0.2nA TOTAL POWER DISSIPATION = 240µW COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED) GAIN BANDWIDTH PRODUCT = 200kHz OUTPUT NOISE = 85 µV P-P 0.1Hz TO 10Hz = 300µVRMS OVER FULL BANDWIDTH INPUT RANGE = 0.03V TO 1.8V OUTPUT RANGE = 0.03V TO 2.3V (0.3mV ≤ V IN+ – VIN– ≤ 23mV) OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS LT2078/79 • TA01 APPLICATIONSUAPPLICATIO SU

Consult LTC Marketing for parts specified with wider operating temperature ranges. ABSOLUTE MAXIMUM RATINGSW WW U Specified Temperature Range TJMAX = 150°C, θJA = 150°C/ WTJMAX = 150°C, θJA = 190°C/ W VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted. LT2078AC/LT2078AI LT2078C/LT2078I LT2079AC/LT2079AI LT2079C/LT2079I SYMBOL PARAMETER CONDITIONS (NOTE 2) MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage LT2078 30 70 40 120 µV LT2079 35 110 40 150 µV ΔVOS Long Term Input Offset 0.4 0.5 µV/Mo ΔTime Voltage Stability IOS Input Offset Current 0.05 0.25 0.05 0.35 nA IB Input Bias Current 6 8 6 10 nA en Input Noise Voltage 0.1Hz to 10Hz (Note 3) 0.6 1.2 0.6 µVP-P Input Noise Voltage Density f O = 10Hz (Note 3) 29 45 29 nV √Hz fO = 1000Hz (Note 3) 28 37 28 nV √Hz in Input Noise Current 0.1Hz to 10Hz (Note 3) 2.3 4.0 2.3 pA P-P Input Noise Current Density f O = 10Hz (Note 3) 0.06 0.10 0.06 pA √Hz fO = 1000Hz 0.02 0.02 pA √Hz Input Resistance (Note 4) Differential Mode 400 800 300 800 M Ω Common Mode 6 6 G Ω 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 CM = 0V to 3.5V 95 110 92 108 dB PSRR Power Supply Rejection Ratio V S = 2.3V to 12V 100 114 98 114 dB

ELECTRICAL CHARACTERISTICS

PACKAGE/ORDER INFORMATIONW UU ORDER PART NUMBER LT2079ACS LT2079AIS LT2079CS LT2079IS TOP VIEW OUT B –IN B +IN B OUT A –IN A +IN A V S8 PACKAGE 8-LEAD PLASTIC SO A B TOP VIEW S PACKAGE 14-LEAD PLASTIC SO OUT A –IN A +IN A V +IN B –IN B OUT B OUT D –IN D +IN D V +IN C –IN C OUT C A D B C (Note 1)

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted (Note 7) LT2078AI/LT2079AI LT2078I/LT2079I SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage LT2078 l 70 250 95 370 µV LT2079 l 80 280 100 400 µV ΔVOS Input Offset Voltage Drift LT2078 l 0.4 1.8 0.5 2.5 µV/°C ΔT (Note 6) LT2079 l 0.6 3.0 0.6 3.5 µV/°C IOS Input Offset Current l 0.07 0.70 0.1 1.0 nA IB Input Bias Current l 71 0 71 2 n A CMRR Common Mode Rejection Ratio V CM = 0.05V to 3.2V l 90 106 86 104 dB PSRR Power Supply Rejection Ratio V S = 3.1V to 12V l 96 110 92 110 dB AVOL Large-Signal Voltage Gain V O = 0.05V to 4V, No Load l 110 600 80 600 V/mV VO = 0.05V to 3.5V, RL = 50k l 80 400 60 400 V/mV Maximum Output Voltage Output Low, No Load l 4.5 8 4.5 8 mV Swing Output Low, I SINK = 100µA l 125 170 125 170 mV Output High, No Load l 3.9 4.2 3.9 4.2 V Output High, 2k to GND l 3.0 3.7 3.0 3.7 V IS Supply Current per Amplifier l 43 60 45 70 µA ELECTRICAL CHARACTERISTICSVS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted. LT2078AC/LT2078AI LT2078C/LT2078I LT2079AC/LT2079AI LT2079C/LT2079I SYMBOL PARAMETER CONDITIONS (NOTE 1) MIN TYP MAX MIN TYP MAX UNITS AVOL Large-Signal Voltage Gain V O = 0.03V to 4V, No Load 200 1000 150 1000 V/mV VO = 0.03V to 3.5V, RL = 50k 150 600 120 600 V/mV Maximum Output Voltage Output Low, No Load 3.5 6 3.5 6 mV Swing Output Low, 2k to GND 0.55 1.2 0.55 1.2 mV Output Low, ISINK = 100µA 95 130 95 130 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 GBW Gain Bandwidth Product f O ≤ 20kHz 200 200 kHz IS Supply Current per Amplifier 38 50 39 55 µA Channel Separation ΔVIN = 3V, RL = 10k, f ≤ 10Hz 110 110 dB Minimum Supply Voltage (Note 5) 2.2 2.3 2.2 2.3 V LT2078AC/LT2079AC LT2078C/LT2079C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage LT2078 l 50 150 60 240 µV LT2079 l 60 180 70 270 µV ΔVOS Input Offset Voltage Drift LT2078 l 0.4 1.8 0.5 2.5 µV/°C ΔT (Note 6) LT2079 l 0.5 3.0 0.6 3.5 µV/°C IOS Input Offset Current l 0.06 0.35 0.06 0.50 nA IB Input Bias Current l 69 6 1 1 n A CMRR Common Mode Rejection Ratio V CM = 0V to 3.4V l 92 108 88 106 dB PSRR Power Supply Rejection Ratio V S = 2.6V to 12V l 98 112 95 112 dB The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, –40 °C ≤ TA ≤ 85°C for I grades, unless otherwise noted.

LT2078AI/LT2079AI LT2078I/LT2079I SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage LT2078 l 90 430 120 600 µV LT2079 l 100 500 130 700 µV ΔVOS Input Offset Voltage Drift LT2078 l 0.5 1.8 0.6 2.5 µV/°C ΔT (Note 6) LT2079 l 0.6 3.0 0.7 3.8 µV/°C IOS Input Offset Current l 0.07 0.70 0.1 1.0 nA IB Input Bias Current l 71 0 71 2 n A AVOL Large-Signal Voltage Gain V O = ±10V, RL = 5k l 200 700 150 700 V/mV CMRR Common Mode Rejection Ratio V CM = 13V, –14.9V l 92 110 88 110 dB PSRR Power Supply Rejection Ratio V S = 5V, 0V to ± 18V l 96 110 92 110 dB Maximum Output Voltage Swing R L = 5k l ±11.0 ±13.5 ±11.0 ±13.5 V IS Supply Current per Amplifier l 52 80 54 95 µA The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ±15V, –40 °C ≤ TA ≤ 85°C for I grades, unless otherwise noted. LT2078AC/LT2079AC LT2078C/LT2079C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS AVOL Large-Signal Voltage Gain V O = 0.05V to 4V, No Load l 150 750 110 750 V/mV VO = 0.05V to 3.5V, RL = 50k l 110 500 80 500 V/mV Maximum Output Voltage Output Low, No Load l 4.0 7 4.0 7 mV Swing Output Low, I SINK = 100µA l 105 150 105 150 mV Output High, No Load l 4.1 4.3 4.1 4.3 V Output High, 2k to GND l 3.3 3.8 3.3 3.8 V IS Supply Current per Amplifier l 40 55 42 63 µA VS = ±15V, TA = 25°C, unless otherwise noted. LT2078AC/LT2078AI LT2078C/LT2078I LT2079AC/LT2079AI LT2079C/LT2079I SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage LT2078 50 250 70 350 µV LT2079 60 350 80 450 µV IOS Input Offset Current 0.05 0.25 0.05 0.35 nA IB Input Bias Current 6 8 6 10 nA Input Voltage Range 13.5 13.8 13.5 13.8 V CMRR Common Mode Rejection Ratio V CM = 13.5V, –15V 98 114 95 114 dB PSRR Power Supply Rejection Ratio V S = 5V, 0V to ±18V 100 114 98 114 dB AVOL Large-Signal Voltage Gain V O = ±10V, RL = 50k 1000 5000 1000 5000 V/mV VO = ±10V, RL = 2k 400 1100 300 1100 V/mV VOUT Maximum Output Voltage R L = 50k ±13.0 ±14.0 ±13.0 ±14.0 V Swing R L = 2k ±11.0 ±13.2 ±11.0 ±13.2 V SR Slew Rate 0.06 0.10 0.06 0.10 V/ µs IS Supply Current per Amplifier 46 65 47 75 µA ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.

LT2078AC/LT2079AC LT2078C/LT2079C SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage LT2078 l 70 330 90 460 µV LT2079 l 80 410 100 540 µV ΔVOS Input Offset Voltage Drift LT2078 l 0.5 1.8 0.6 2.5 µV/°C ΔT (Note 6) LT2079 l 0.6 3.0 0.7 3.8 µV/°C IOS Input Offset Current l 0.06 0.35 0.06 0.50 nA IB Input Bias Current l 69 6 1 1 n A AVOL Large-Signal Voltage Gain V O = ±10V, RL = 5k l 300 1200 250 1200 V/mV CMRR Common Mode Rejection Ratio V CM = 13V, –15V l 95 112 92 112 dB PSRR Power Supply Rejection Ratio V S = 5V, 0V to ± 18V l 98 112 95 112 dB Maximum Output Voltage Swing R L = 5k l ±11.0 ±13.6 ±11.0 ±13.6 V IS Supply Current per Amplifier l 49 73 50 85 µA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Typical parameters are defined as the 60% yield of parameter distributions of individual amplifiers, i.e., out of 100 LT2079s (or 100 LT2078s) typically 240 op amps (or 120) will be better than the indicated specification. Note 3: This parameter is tested on a sample basis only. All noise parameters are tested with V S = ±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. Note 7: The LT2078C/LT2079C are designed, characterized and expected to meet the industrial temperature limits, but are not tested at –40 °C and 85°C. I-grade parts are guaranteed. TYPICAL PERFORMANCE CHARACTERISTICS UW ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VS = ± 15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted (Note 7). Input Bias Current vs Common Mode Voltage COMMON MODE VOLTAGE (V) INPUT BIAS CURRENT (nA) –10 –12 0123 LT2078/79 • TPC03 TA = 125°C TA = –55°C VS = 5V, 0V TA = 25°C Input Bias and Offset Currents vs Temperature TEMPERATURE (°C) –50 BIAS CURRENT (nA) OFFSET CURRENT (pA) 100 0 50 75 LT2078/79 • TPC02 –25 25 100 125 IOS IB VS = 5V, 0V TO –15V Distribution of Offset Voltage Drift with Temperature OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C) PERCENT OF UNITS (%) LT2078/79 • TPC01 –2 –1 0 1 2 VS = 5V, 0V VCM = 0.1V

80 LT2078'S

25 LT2079'S

= 260 OP AMPS

TIME (SEC) NOISE VOLTAGE (0.4µV/DIV) LT2078/79 • TPC04 2 4 6 10 CHANNEL A CHANNEL B TA = 25°C VS = –2.5V TYPICAL PERFORMANCE CHARACTERISTICS UW Noise Spectrum0.01Hz to 10Hz Noise TIME (SEC) NOISE VOLTAGE (0.4µV/DIV) LT2078/79 • TPC05 20 40 60 100 CHANNEL B TA = 25°C VS = –2.5V CHANNEL A 0.4µV FREQUENCY (Hz) 0.1 1 100 VOLTAGE NOISE DENSITY (nV/√Hz) CURRENT NOISE DENSITY (fA/√Hz) 100 1000 300 10 1000 LT2078/79 • TPC06 CURRENT NOISE VOLTAGE NOISE 1/f CORNER 0.7Hz TA = 25°C VS = –2.5V (AT VS = –15V VOLTAGE NOISE IS 4% LESS CURRENT NOISE IS UNCHANGED) Warm-Up Drift Long Term Stability of Two Representative Units (LT2078)10Hz Voltage Noise Distribution VOLTAGE NOISE DENSITY (nV/ÖHz) LT2078/79 • TPC07 30 35 40 PERCENT OF UNITS TA = 25°C VS = –2.5V TIME AFTER POWER-ON (MINUTES) CHANGE IN OFFSET VOLTAGE (µV) LT2078/79 • TPC09 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 TA = 25°C VS = –15V WARM UP DRIFT AT V S = 5V, 0V IS IMMEASURABLY LOW LT2079 LT2078 TIME (MONTHS) OFFSET VOLTAGE CHANGE (µV) 1234 LT2078/79 • TPC08 –10 –15 TA = 25°C, VS = 5V, 0V VCM = 0.1V Output Voltage Swing vs Load Current Output Saturation vs Temperature vs Sink CurrentMinimum Supply Voltage POSITIVE SUPPLY VOLTAGE (V) INPUT OFFSET VOLTAGE (µV) 100 –100 –200 –300 –400 –500 LT2078/79 • TPC10 1 23 V– = 0V –0.1V ≤ VCM ≤ 0.4V 125°C –55°C 0°C 25°C 70°C NONFUNCTIONAL TEMPERATURE (°C) –50 SATURATION VOLTAGE (mV) 1000 100 –25 125 LT2078/79 • TPC11 0 25 50 100 75 ISINK = 2mA ISINK = 1mA ISINK = 100µA ISINK = 1µA NO LOAD RL = 5k TO GND ISINK = 10µA VS = 5V, 0V SOURCING OR SINKING LOAD CURRENT (mA) 0.01 OUTPUT VOLTAGE SWING (V) V+ – 1 V+ – 2 V– + 2 V– + 1 LT2078/79 • TPC11.5 0.1 1 125°C 25°C –55 °C 125°C –55 °C 25°C 0.1Hz to 10Hz Noise

TYPICAL PERFORMANCE CHARACTERISTICS UW Voltage Gain vs Load Resistance LOAD RESISTANCE TO GROUND (Ω ) 100 100k VOLTAGE GAIN (V/V) 10M 10k 100k1k 1M LT2078/79 • TPC14 25°C –55 °C125°C 25°C –55 °C 125°C VS = –15V VS = 5V, 0V Capacitive Load Handling Gain, Phase vs Frequency FREQUENCY (kHz) –10 100 300 LTC2078/79 TPC12 VOLTAGE GAIN (dB) 100 120 140 160 180 200 PHASE SHIFT (DEG) 10 1000 PHASE MARGIN 58° PHASE MARGIN 46° 5V, 0V –15V –15V 5V, 0V Voltage Gain vs Frequency FREQUENCY (Hz) 0.01 VOLTAGE GAIN (dB) LT2078/79 • TPC13 1 100 10k 140 120 100 –20 0.1 10 1k 100k VS = –15V VS = 5V, 0V TA = 25°C Slew Rate, Gain Bandwidth Product and Phase Margin vs Temperature TEMPERATURE (°C) –50 GAIN BANDWIDTH PRODUCT (kHz) SLEW RATE (V/ µs) PHASE MARGIN (DEG) 0.12 0.10 0.08 0.06 0.04 240 220 200 180 160 0 50 75 LT2078/79 • TPC15 –25 25 100 125 SLEW = –15V GBW = –15V GBW = 5V, 0V SLEW = 5V, 0V φM = –15V φM = 5V, 0V fO = 20kHz Channel Separation vs Frequency FREQUENCY (Hz) CHANNEL SEPARATION (dB) 120 100 10 100 1k 10k LT2078/79 • TPC16 100k 1M TA = 25°C VS = –2.5V VIN = 3VP-P RL = 10k CAPACITIVE LOAD (pF) OVERSHOOT (%) 120 100 10000 LT2078/79 • TPC17 1000100 TA = 25°C VS = 5V, 0V AV = 1 AV = 10 AV = 5 Power Supply Rejection Ratio vs Frequency Undistorted Output Swing vs Frequency Common Mode Rejection Ratio vs Frequency FREQUENCY (Hz) COMMON MODE REJECTION RATIO (dB) 100 1k 10k 100k LT2078/79 • TPC19 TA = 25°C 120 100 VS = –15V VS = 5V, 0V FREQUENCY (kHz) 0.01 PEAK-TO-PEAK OUTPUT SWING, VS = – 15V (V) PEAK-TO-PEAK OUTPUT SWING, VS = 5V, 0V (V) 100 LT2078/79 • TPC18 11 0 VS = 5V, 0V RL ‡ 100k VS = –15V RL ‡ 100k VS = –15V RL = 30k VS = 5V, 0V RL ‡ 1k TA = 25°C LOAD RL, TO GND FREQUENCY (Hz) 0.1 POWER SUPPLY REJECTION RATIO (dB) 120 100 100 10k LT2078/79 • TPC20 11 0 1k 100k 1M TA = 25°C VS = –2.5V + 1VP-P SINE WAVE POSITIVE SUPPLYNEGATIVE SUPPLY

TYPICAL PERFORMANCE CHARACTERISTICS UW Supply Current vs Temperature TEMPERATURE (°C) –50 SUPPLY CURRENT PER AMPLIFIER (µA) 25 75 LT2078/79 • TPC21 –25 0 50 100 125 VS = –15V VS = 5V, 0V Small-Signal Transient Response VS = 5V, 0V 20mV/DIV AV = 1 10 µs/DIV CL = 15pF INPUT 50mV TO 150mV LT2078/79 • TPC24 Closed-Loop Output Impedance FREQUENCY (Hz) OUTPUT IMPEDANCE (Ω ) 100 0.1 LT2078/79 • TPC23 10 100 1k 10k 100k AV = 100 AV = 10 AV = 1 Small-Signal Transient Response VS = ± 15V 20mV/DIV AV = 1 10 µs/DIV CL = 15pF LT2078/79 • TPC26 Common Mode Range vs Temperature TEMPERATURE (°C) –50 COMMON MODE RANGE (V) –25 0 25 50 75 LT2078/79 • TPC22 125 V+ – 1 V+ – 2 V– + 1 V– – 1 100 V+ = 2.5V TO 18V V– = 0V TO –18V Small-Signal Transient Response VS = ± 2.5V 20mV/DIV AV = 1 10 µs/DIV CL = 15pF LT2078/79 • TPC25 Large-Signal Transient Response VS = 5V, 0V 1V/DIV AV = 1, NO LOAD 50 µs/DIV INPUT PULSE 0V TO 3.8V LT2078/79 • TPC27 Large-Signal Transient Response VS = ± 15V 5V/DIV AV = 1 100 µs/DIV NO LOAD LT2078/79 • TPC28

1/2 LT2078, 1/4 LT2079 10k 10k 2.2k 5.6k Q5 Q6 Q11 600Ω 600Ω Q21 Q22 175pF 6.2k Q28 Q12 Q16 Q14 Q29 Q4 Q24 8.6k C1 50pF 2.5pFQ27 Q10 Q17 6.2k Q19 Q18 Q15 Q32 1.3k 3.6k Q37 Q30 1 3 Q25 4pF 2.9k Q31C3 40pF Q23 Q20 1.35k 30Ω Q34 Q36 OUT Q26 30Ω Q35 Q54 1 1 2 150k Q33 10k Q38 5.35k Q45 Q55 Q51 Q42 Q44 Q46 Q47 11.5k 12.5k Q40 Q41 Q48 9.1k Q43 700k 700k LT2078/79 • SIMPLIFIED SCHEM IN– IN+ Q50 Q49 Q39 Q53 Q52

APPLICATIONS INFORMATIONWU UU The LT2078/LT2079 devices are fully specified with V+ = 5V, V – = 0V, V CM = 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, V S = ±2.5V, VCM = 0V is equivalent to a common mode voltage change of 2.4V or a V OS change of 7µV if CMRR = 110dB (3µV/V). A full set of specifications is also provided at ± 15V supply voltages for comparison with other devices and for com- pleteness. Single Supply Operation The LT2078/LT2079 is quite tolerant of power supply bypassing. In some applications requiring faster settling time the positive supply pin of the LT2078/LT2079 should be bypassed with a small capacitor (about 0.1 µF). The same is true for the negative supply pin when using split supplies. The LT2078/LT2079 are 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 applica- tions these competing devices cannot be operated as micropower op amps and swing to ground simultaneously. As an example, consider the instrumentation amplifier shown on the front page. When the common mode signal is low and the output is high, amplifier A has to sink current. When the common mode signal is high and the output low, amplifier B has to sink current. The competing devices require a 12k pull-down resistor at the output of amplifier A and a 15k at the output of B to handle the specified signals. (The LT2078 does not need pull-down resistors.) When the common mode input is high and the output is high these pull-down resistors draw 300µA (150µA each), which is excessive for micropower applications. The instrumentation amplifier is by no means the only application requiring current sinking capability. In seven of the nine single supply applications shown in this data sheet the op amps have to be able to sink current. In two of the applications the first amplifier has to sink only the 6nA input bias current of the second op amp. The compet- ing devices, however, cannot even sink 6nA without a pull-down resistor Since the output of the LT2078/LT2079 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 in Figure 1, but is not enough to make the amplifier function properly in the voltage follower mode. 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 (1 and 2), OP-90/290/490 (2 only): Figure 1a. Gain 100 Amplifier Figure 1b. Voltage Follower 1mV R 99R 100mV LT2078/79 • F02a + 1mV OUTPUT SATURATION ≈ 3.5mV LT2078/79 • F02b

1. When the input is more than a diode drop below ground,

the devices even when the input is 5V below ground.

1. When the input is more than 400mV below ground (at

illustrated in Figure 2, even when the inputs are at –1V. Figure 2. Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V)

R G 200k 9.1M 9.1M 20M OUTPUT 4mV TO 8.2V R 10M 20M –IN +IN GAIN = 1 + () 2R1 RG = 100 FOR VALUES SHOWN LT2078/79 • TA05 INPUT BIAS CURRENT TYPICALLY < 150pA INPUT RESISTANCE = 3R = 30M FOR VALUES SHOWN NEGATIVE COMMON MODE LIMIT = (I B)(2R) + 20mV » 140mV GAIN BANDWIDTH PRODUCT = 1.8MHz Picoampere Input Current, Triple Op Amp Instrumentation Amplifier with Bias Current Cancellation 85V, –100V Common Mode Range Instrumentation Amplifier (AV = 10) 1/2 LT2078 100k 100k 1/2 LT2078 OUTPUT 8V TO –9V LT2078/79 • TA06 BANDWIDTH= 2kHz OUTPUT OFFSET= 8mV OUTPUT NOISE= 0.8mVP-P (0.1Hz TO 10Hz) = 1.4mVRMS OVER FULL BANDWIDTH (DOMINATED BY RESISTOR NOISE) –9V 10M 10M 10M +IN –IN INPUT RESISTANCE = 10M Absolute Value Circuit (Full-Wave Rectifier) 1/2 LT2078 1/2 LT2078 OUTPUT LT2078/79 • TA08 VOMIN = 4mV NO DISTORTION TO 100Hz 200k 200k INPUT 1N41483.5V –3.5V 3.5V Half-Wave Rectifier 1/2 LT2078 OUTPUT LT2078/79 • TA07 VOMIN = 6mV NO DISTORTION TO 100Hz INPUT 1.8V –1.8V 1.8V Programmable Gain Amplifier (Single Supply)

14 OUT

A C B + 1/4 LT2079 CD4016B 13 5 6 114 3V TO 18V 3V TO 18V 1M100k10k1.11k IN LT2078/79 • TA09 ERROR DUE TO SWITCH ON RESISTANCE, LEAKAGE CURRENT, NOISE AND TRANSIENTS ARE ELIMINATED CD4016B GAIN PIN 13 PIN 5 PIN 6

1000 HIGH LOW LOW

100 LOW HIGH LOW

10 LOW LOW HIGH

Single Supply, Micropower, Second Order Lowpass Filter with 60Hz Notch 71/2 LT20782.64M 0.1% 2.64M 0.1% 1/2 LT2078 OUTPUT TYPICAL OFFSET » 600µV LT2078/79 • TA10 1.35M 0.1% IN 2000pF 0.5% 1000pF 0.5% 1000pF 0.5% 0.02µF 5.1M 120k 100pF 0.01µF 27.6k 0.1% 27.6k 0.1% fC = 40Hz Q = 30 Micropower Multiplier/Divider 1/4 LT2079 71 4 1/4 LT2079 1 1/4 LT2079 8 –1.5V TO –9V 505k 0.1% 505k 0.1% 505k 0.1% 220pF 220pF 30k 30k Q1 – 220pF 30k Y INPUT (5mV TO 50V) X INPUT (5mV TO 50V) Q2 Q4 499k 0.5% 10k GAIN Z INPUT (5mV TO 50V) OUTPUT (5mV TO 8V) 1/4 LT2079 Q1,Q2, Q3, Q4 = MAT-04 TYPICAL LINEARITY = 0.01% OF FULL-SCALE OUTPUT OUTPUT = , POSITIVE INPUTS ONLY(X)(Y) (Z) NEGATIVE SUPPLY CURRENT = 165µA + X + Y+ Z + OUT 500k POSITIVE SUPPLY CURRENT = 165µA + BANDWIDTH (< 3VP-P SIGNAL): X AND Y INPUTS = 10kHz Z INPUT = 4kHz OUT 500k lt2078/79 • TA11 Micropower Dead Zone Generator 1/4 LT2079 510k 1M 1M 1M* 2N4393 1/4 LT2079 1/4 LT2079 1/4 LT2079 1M** Q2 Q3 470k 1M* GAIN 200k 510k 1M** 510k 1M 680k 1N914 1N914 –9V 2N4393 1000pF VSET DEAD ZONE CONTROL INPUT 0.4V TO 5V V OUT LT2078/79 • TA12 BIPOLAR SYMMETRY IS EXCELLENT BECAUSE ONE DEVICE, Q2, SETS BOTH LIMITS SUPPLY CURRENT » 240µA BANDWIDTH = 150kHz INPUT 1% FILM RATIO MATCH 0.05% Q2, Q3, Q4, Q5 CA3096 TRANSISTOR ARRAY VSET VSET VOUT VIN

8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 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. TYPICAL APPLICATIONSU Lead-Acid Low-Battery Detector with System Shutdown 1/2 LT2078 1/2 LT2078 255k 280k 910k LT1004-1.2 LO = BATTERY LOW (IF VS < 10.90V) LO = SYSTEM SHUTDOWN (IF VS < 10.05V) BATTERY OUTPUT LT2078/79 • TA13 TOTAL SUPPLY CURRENT = 105µA 12V PACKAGE DESCRIPTIONU .016 – .050 (0.406 – 1.270) .010 – .020 0°– 8° TYP .008 – .010 (0.203 – 0.254) SO8 0303 .053 – .069 (1.346 – 1.752) .014 – .019 (0.355 – 0.483) TYP .004 – .010 (0.101 – 0.254) .050 (1.270) BSC 1 2 3 4 .150 – .157 (3.810 – 3.988) NOTE 3 8 7 6 5 .189 – .197 (4.801 – 5.004) NOTE 3 .228 – .244 (5.791 – 6.197) .245 MIN .160 –.005 RECOMMENDED SOLDER PAD LAYOUT .045 –.005 .050 BSC .030 –.005 TYP INCHES (MILLIMETERS) NOTE: 1. DIMENSIONS IN 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)

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear.com LT/GP 0903 1K REV A • PRINTED IN USA  LINEAR TECHNOLOGY CORPORA TION 1 996 Platinum RTD Signal Conditioner with Curvature Correction 1/2 LT2078 LT1004-1.2 71/2 LT2078 13k* 12.3k* 1k 1k 1k RP 1k AT 0°C 43.2k 1.21M* (SELECT AT 110°C) 220°C TRIM 1µF 10k* 50k 5°C TRIM 1µF 0.02V TO 2.2VOUT = 2°C TO 220°C –0.1°C 3V (LITHIUM) RP = ROSEMOUNT 118MF = TRW MAR-6 0.1% = 1% METAL FILM LT2078/79 • TA14 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1178/LT1179 Dual/Quad 17 µA Max, Single Supply Precision Op Amps 70 µV VOS Max and 2.5µV/°C Drift Max, 85kHz GBW, 0.04V/µs Slew Rate, Input/Output Common Mode Includes Ground LT1211/LT1212 14MHz, 7V/ µs Single Supply Dual and Quad Precision Op Amps 275 µV VOS Max, 6µV/°C Drift Max Input Voltage Range Includes Ground LT1490/LT1491 Dual/ Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: –0.4V to 44V, Micropower 50 µA Amplifier, Rail-to-Rail Input and Output, 200kHz GBW LT2178/LT2179 Dual/Quad 17 µA Max, Single Supply Precision Op Amps SO-8 and 14-Lead Standard Pinout, 70 µV VOS Max, 85kHz GBW TYPICAL APPLICATIONU S Package 14-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) PACKAGE DESCRIPTIONU N 2 3 4 .150 – .157 (3.810 – 3.988) NOTE 3 14 13 .337 – .344 (8.560 – 8.738) NOTE 3 .228 – .244 (5.791 – 6.197) 12 11 10 9 5 6 7 N/2 .016 – .050 (0.406 – 1.270) .010 – .020 0° – 8° TYP .008 – .010 (0.203 – 0.254) S14 0502 .053 – .069 (1.346 – 1.752) .014 – .019 (0.355 – 0.483) TYP .004 – .010 (0.101 – 0.254) .050 (1.270) BSC .245 MIN N 1 2 3 N/2 .160 –.005 RECOMMENDED SOLDER PAD LAYOUT .045 –.005 .050 BSC .030 –.005 TYP INCHES (MILLIMETERS) NOTE: 1. DIMENSIONS IN 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)