LT1114ACN#PBF

LT1112/LT1114 Dual/Quad Low Power Precision, Picoamp Input Op Amps U FEATURES DESCRIPTIO ■ The LT®1112 dual and LT1114 quad op amps achieve a new standard in combining low cost and outstanding precision specifications. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Offset Voltage – Prime Grade: 60µV Max Offset Voltage – Low Cost Grade (Including Surface Mount Dual/Quad): 75µV Max Offset Voltage Drift: 0.5µV/°C Max Input Bias Current: 250pA Max 0.1Hz to 10Hz Noise: 0.3µVP-P, 2.2pAP-P Supply Current per Amplifier: 400µA Max CMRR: 120dB Min Voltage Gain: 1 Million Min Guaranteed Specs with ±1.0V Supplies Guaranteed Matching Specifications SO-8 Package – Standard Pinout LT1114 in Narrow Surface Mount Package U APPLICATIO S ■ ■ ■ ■ ■ Picoampere/Microvolt Instrumentation Two and Three Op Amp Instrumentation Amplifers Thermocouple and Bridge Amplifiers Low Frequency Active Filters Photo Current Amplifiers Battery-Powered Systems The LT1112/LT1114 also provide a full set of matching specifications, facilitating their use in such matching dependent applications as two and three op amp instrumentation amplifiers. Another set of specifications is furnished at ±1V supplies. This, combined with the low 320µA supply current per amplifier, allows the LT1112/LT1114 to be powered by two nearly discharged AA cells. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Protected by U.S. Patents 4,575,685; 4,775,884 and 4,837,496 U ■ The performance of the selected prime grades matches or exceeds competitive devices. In the design of the LT1112/ LT1114 however, particular emphasis has been placed on optimizing performance in the low cost plastic and SO packages. For example, the 75µV maximum offset voltage in these low cost packages is the lowest on any dual or quad non-chopper op amp. TYPICAL APPLICATIO Distribution of Input Offset Voltage (In All Packages) Dual Output, Buffered Reference (On Single 3V Supply) 30 3V 2 – 8 1/2 LT1112 3 75k 0.1% 1 + LT1004-1.2 25 PERCENT OF UNITS 15k TOTAL SUPPLY CURRENT = 700µA 2V REFERENCE: SOURCES 1.7mA, SINKS 5mA RX OPTIONAL RX = 300Ω INCREASES SOURCE CURRENT TO 5mA 0.765V REFERENCE: SOURCES 5mA, SINKS 0.5mA TEMPERATURE COEFFICIENT LIMITED BY REFERENCE = 20ppm/°C 2.000V MINIMUM SUPPLY = 2.7V VS = ±15V TA = 25°C 20 15 10 5 6 – 1/2 LT1112 5 46.4k 0.1% + 7 0.765V 4 0 –70 –50 50 30 –30 –10 10 INPUT OFFSET VOLTAGE (µV) 70 LT1112/14 • TA02 LT1112/14 • TA01 111214fb 1 LT1112/LT1114 W W W AXI U U ABSOLUTE RATI GS (Note 1) Supply Voltage ..................................................... ±20V Differential Input Current (Note 2) ..................... ±10mA Input Voltage (Equal to Supply Voltage) ............... ±20V Output Short-Circuit Duration ......................... Indefinite Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................ 300°C Operating Temperature Range (Note 11) LT1112AM/LT1112M LT1114AM/LT1114M (OBSOLETE)... – 55°C to 125°C LT1112AC/LT1112C/LT1112S8 LT1114AC/LT1114C/LT1114S .......... – 40°C to 85°C LT1112I/LT1114I .............................. – 40°C to 85°C LT1112MPS8 ................................... –55°C to 125°C Specified Temperature Range (Note 12) LT1112AM/LT1112M LT1114AM/LT1114M (OBSOLETE) ... – 55°C to 125°C LT1112AC/LT1112C/LT1112S8 LT1114AC/LT1114C/LT1114S .......... – 40°C to 85°C LT1112I/LT1114I .............................. – 40°C to 85°C LT1112MPS8 ................................... –55°C to 125°C U U W PACKAGE/ORDER I FOR ATIO TOP VIEW OUT A 1 –IN A 2 A +IN A 3 8 V+ 7 OUT B 6 –IN B 5 +IN B B V– 4 N8 PACKAGE 8-LEAD PDIP ORDER PART NUMBER TOP VIEW LT1112ACN8 LT1112CN8 LT1112IN8 OUT A 1 –IN A 2 8 V+ 7 OUT B 6 –IN B 5 +IN B LT1112S8 LT1112IS8 LT1112MPS8 B 4 TJMAX = 150°C, θJA = 130°C/W LT1112AMJ8 LT1112MJ8 A +IN A 3 V– J8 PACKAGE 8-LEAD CERDIP TJMAX = 160°C, θJA = 100°C/W ORDER PART NUMBER S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 190°C/W OBSOLETE PACKAGE S8 PART MARKING 1112 1112I 1112MP Consider the N8 Package for Alternate Source TOP VIEW OUT A 1 –IN A 2 +IN A 3 14 OUT D A 13 –IN D D 12 +IN D V+ 4 11 V – +IN B 5 10 +IN C –IN B 6 OUT B 7 B ORDER PART NUMBER C LT1114ACN LT1114CN LT1114IN ORDER PART NUMBER TOP VIEW 16 OUT D OUT A 1 –IN A 2 A +IN A 3 D V+ 4 15 –IN D 14 +IN D 13 V – 9 –IN C +IN B 5 8 OUT C –IN B 6 11 –IN C OUT B 7 10 OUT C N PACKAGE 14-LEAD PDIP NC 8 LT1114S LT1114IS B C 12 +IN C 9 NC TJMAX = 150°C, θJA = 110°C/W J PACKAGE 14-LEAD CERDIP TJMAX = 160°C, θJA = 80°C/W (J) OBSOLETE PACKAGE LT1114AMJ LT1114MJ S PACKAGE 16-LEAD PLASTIC SO (NARROW) TJMAX = 150°C, θJA = 150°C/W Consider the N Package for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. 111214fb 2 LT1112/LT1114 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER VOS Input Offset Voltage ∆VOS ∆Time Long Term Input Offset Voltage Stability IOS Input Offset Current VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted. CONDITIONS (Note 3) LT1112AM/AC LT1114AM/AC MIN TYP MAX LT1112M/C/I LT1114M/C/I MIN TYP MAX 20 40 25 45 VS = ±1.0V 60 110 0.3 Input Bias Current 50 180 60 75 230 330 pA pA ±70 ±250 ±80 ±100 ±280 ±450 pA pA LT1114S/LT1114IS en in Input Noise Voltage 0.1Hz to 10Hz (Note 10) 0.3 0.9 0.3 0.9 µVP-P Input Noise Voltage Density fO = 10Hz (Note 10) fO = 1000Hz (Note 10) 16 14 28 18 16 14 28 18 nV/√Hz nV/√Hz Input Noise Current 0.1Hz to 10Hz 2.2 2.2 Input Noise Current Density fO = 10Hz fO = 1000Hz 0.030 0.008 0.030 0.008 pA/√Hz pA/√Hz VCM Input Voltage Range CMRR Common Mode Rejection Ratio PSRR RIN µV µV µV/Mo 0.3 LT1114S/LT1114IS IB 75 130 UNITS VCM = ±13.5V pAP-P ±13.5 ±14.3 ±13.5 ±14.3 V 120 136 115 136 dB 126 114 126 dB Power Supply Rejection Ratio VS = ±1.0V to ±20V 116 Minimum Supply Voltage (Note 5) ±1.0 Input Resistance Differential Mode Common Mode (Note 4) 20 50 800 15 40 700 MΩ GΩ ±1.0 V AVOL Large-Signal Voltage Gain VO = ±12V, RL = 10kΩ VO = ±10V, RL = 2kΩ 1000 800 5000 1500 800 600 5000 1300 V/mV V/mV VOUT Output Voltage Swing RL = 10kΩ RL = 2kΩ ±13.0 ±11.0 ±14.0 ±12.4 ±13.0 ±11.0 ±14.0 ±12.4 V V SR Slew Rate 0.16 0.30 0.16 0.30 V/µs GBW Gain-Bandwidth Product 450 750 450 750 kHz IS Supply Current per Amplifier fO = 10kHz VS = ±1.0V 350 320 400 370 350 320 450 420 µA µA Channel Separation fO = 10Hz 150 ∆VOS Offset Voltage Match (Note 6) 35 100 150 40 130 µV dB ∆IB+ Noninverting Bias Current Match (Notes 6, 7) 100 450 LT1114S/LT1114IS 100 120 500 680 pA pA ∆CMRR Common Mode Rejection Match (Notes 6, 8) 117 136 113 136 dB ∆PSRR Power Supply Rejection Match (Notes 6, 8) 114 130 112 130 dB 111214fb 3 LT1112/LT1114 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of – 55°C ≤ TA ≤ 125°C, otherwise specifications are at TA = 25°C. VS = ±15V, unless otherwise noted. SYMBOL PARAMETER VOS CONDITIONS (Note 3) LT1112AMJ8 LT1114AMJ MIN TYP MAX LT1112MJ8/MPS8 LT1114MJ MIN TYP MAX 45 45 70 150 160 260 µV µV µV UNITS ● ● ● 35 120 LT1112MPS8 VS = ±1.2V 60 220 (Note 9) LT1112MPS8 ● ● 0.15 0.5 0.20 0.4 0.75 1.3 µV/°C µV/°C 80 400 100 500 pA ±150 ±600 ±170 ±700 pA Input Offset Voltage ∆VOS ∆Temp Average Input Offset Voltage Drift IOS Input Offset Current ● IB Input Bias Current ● VCM Input Voltage Range ● ±13.5 ±14.1 ±13.5 ±14.1 V CMRR Common Mode Rejection Ratio VCM = ±13.5V ● 116 130 111 130 dB PSRR Power Supply Rejection Ratio VS = ±1.2V to ±20V ● 112 124 110 124 dB AVOL Large-Signal Voltage Gain VO = ±12V, RL = 10kΩ VO = ±10V, RL = 2kΩ ● ● 500 200 2500 600 400 170 2500 500 V/mV V/mV VOUT Output Voltage Swing RL = 10kΩ ● SR Slew Rate ● IS Supply Current per Amplifier ● 380 460 380 530 µA ∆VOS Offset Voltage Match (Note 6) ● ● 55 200 LT1112MPS8 70 70 240 270 µV µV Offset Voltage Match Drift (Notes 6, 9) ● ● 0.2 0.7 LT1112MPS8 0.3 0.5 1.0 1.9 µV/°C µV/°C ∆IB+ Noninverting Bias Current Match (Notes 6, 7) ● 150 750 170 850 pA ∆CMRR Common Mode Rejection Ratio (Notes 6, 8) ● 112 130 106 130 dB ∆PSRR Power Supply Rejection Ratio (Notes 6, 8) ● 109 126 106 126 dB ±13.0 ±13.85 0.12 ±13.0 ±13.85 0.22 0.12 V 0.22 V/µs The ● denotes the specifications which apply over the full operating temperature range of 0°C ≤ TA ≤ 70°C, otherwise specifications are at TA = 25°C. VS = ±15V, unless otherwise noted. LT1112ACN8 LT1114ACN MIN TYP MAX LT1112CN8/S8/IS8 LT1114CN/S/IS MIN TYP MAX SYMBOL PARAMETER CONDITIONS (Note 3) VOS Input Offset Voltage LT1112CN8 LT1112S8, LT1114CN/S VS = ±1.2V ● ● ● 27 35 50 100 125 175 30 45 65 125 150 210 µV µV µV ∆VOS ∆Temp Average Input Offset Voltage Drift (Note 9) LT1112CN8 LT1112S8, LT1114CN/S ● ● 0.15 0.3 0.5 1.1 0.2 0.4 0.75 1.3 µV/°C µV/°C IOS Input Offset Current ● ● 60 220 LT1114S 70 90 290 420 pA pA ● ● ±80 ±300 LT1114S ±90 ±115 ±350 ±550 pA pA IB Input Bias Current VCM Input Voltage Range CMRR Common Mode Rejection Ratio UNITS ● ±13.5 ±14.2 ±13.5 ± 14.2 V VCM = ±13.5V ● 118 133 113 133 dB PSRR Power Supply Rejection Ratio VS = ±1.2V to ±20V ● 114 125 112 125 dB AVOL Large-Signal Voltage Gain VO = ±12V, RL = 10kΩ VO = ±10V, RL = 2kΩ ● ● 800 500 4000 1300 650 400 4000 1000 V/mV V/mV VOUT Output Voltage Swing RL = 10kΩ ● ±13.0 ±13.9 ±13.0 ±13.9 V SR Slew Rate ● 0.14 0.27 0.14 0.27 V/µs 111214fb 4 LT1112/LT1114 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range of 0°C ≤ TA ≤ 70°C, otherwise specifications are at TA = 25°C. VS = ±15V, unless otherwise noted. SYMBOL PARAMETER LT1112ACN8 LT1114ACN MIN TYP MAX LT1112CN8/S8/IS8 LT1114CN/S/IS MIN TYP MAX ● 370 440 370 500 µA CONDITIONS (Note 3) UNITS IS Supply Current per Amplifier ∆VOS Offset Voltage Match (Note 6) LT1112CN8 LT1112S8, LT1114CN/S ● ● 45 55 170 220 55 70 210 270 µV µV Offset Voltage Match Drift (Notes 6, 9) LT1112N8 LT1112S8, LT1114CN/S ● ● 0.2 0.4 0.7 1.6 0.3 0.5 1.0 1.9 µV/°C µV/°C Noninverting Bias Current Match (Notes 6, 7) ● ● 120 530 LT1114S 135 160 620 880 pA pA ∆CMRR Common Mode Rejection Ratio (Notes 6, 8) ● 114 134 109 134 dB ∆PSRR Power Supply Rejection Ratio (Notes 6, 8) ● 110 128 108 128 dB ∆IB+ The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, unless otherwise noted. (Note 12) LT1112ACN8 LT1112CN8/IN8/S8/IS8 LT1114ACN LT1114CN/S/IS MIN TYP MAX MIN TYP MAX SYMBOL PARAMETER CONDITIONS (Note 3) VOS Input Offset Voltage LT1112CN8/IN8 LT1112S8/IS8, LT1114CN/S/IS VS = ±1.2V ● ● ● 30 40 55 110 135 200 35 45 60 135 160 240 µV µV µV ∆VOS ∆Temp Average Input Offset Voltage Drift LT1112CN8/IN8 LT1112S8/IS8, LT1114CN/S/IS ● ● 0.15 0.30 0.50 1.10 0.20 0.40 0.75 1.30 µV/°C µV/°C IOS Input Offset Current ● ● 70 330 LT1114S/IS 85 110 400 600 pA pA ● ● ±110 ±500 LT1114S/IS ±120 ±150 ±550 ±800 pA pA IB Input Bias Current UNITS ● ±13.5 ±14.1 ±13.5 ±14.1 V VCM = ±13.5V ● 117 132 112 132 dB VS = ±1.2V to ±20V ● 113 125 111 125 dB VO = ±12V, RL = 10kΩ VO = ±10V, RL = 2kΩ ● ● 700 400 3300 1100 600 300 3300 900 V/mV V/mV RL = 10kΩ ● VCM Input Voltage Range CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio AVOL Large-Signal Voltage Gain VOUT Output Voltage Swing SR Slew Rate IS Supply Current per Amplifier ● 370 450 370 510 µA ∆VOS Offset Voltage Match (Note 6) LT1112CN8/IN8 LT1112S8/IS8, LT1114CN/S/IS ● ● 50 60 180 230 60 70 225 270 µV µV Offset Voltage Match Drift (Notes 6) LT1112CN8/IN8 LT1112S8/IS8, LT1114CN/S/IS ● ● 0.2 0.4 0.7 1.6 0.3 0.5 1.0 1.9 µV/°C µV/°C Noninverting Bias Current Match (Notes 6, 7) ● ● 140 660 LT1114S/IS 155 190 770 1300 ∆CMRR Common Mode Rejection Ratio (Notes 6, 8) ● 113 133 109 133 dB ∆PSRR Power Supply Rejection Ratio (Notes 6, 8) ● 110 127 107 127 dB ∆IB+ ● Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Differential input voltages greater than 1V will cause excessive current to flow through the input protection diodes unless limiting resistance is used. ±13.0 ±13.85 ±13.0 ±13.85 0.13 0.13 0.24 V 0.24 V/µs pA pA Note 3: Typical parameters are defined as the 60% yield of parameter distributions of individual amplifiers; i.e., out of 100 LT1114s (or 100 LT1112s) typically 240 op amps (or 120) will be better than the indicated specification. Note 4: This parameter is guaranteed by design and is not tested. 111214fb 5 LT1112/LT1114 ELECTRICAL CHARACTERISTICS Note 5: Offset voltage, supply current and power supply rejection ratio are measured at the minimum supply voltage. Note 6: Matching parameters are the difference between amplifiers A and D and between B and C on the LT1114; between the two amplifiers on the LT1112. Note 7: This parameter is the difference between two noninverting input bias currents. Note 8: ∆CMRR and ∆PSRR are defined as follows: (1) CMRR and PSRR are measured in µV/V on the individual amplifiers. (2) The difference is calculated between the matching sides in µV/V. (3) The result is converted to dB. Note 9: This parameter is not 100% tested. Note 10: These parameters are not tested. More than 99% of the op amps tested during product characterization have passed the maximum limits. 100% passed at 1kHz. Note 11: The LT1112AC/LT1112C/LT1112S8/LT1112I and LT1114AC/ LT1114C/LT1114S/LT1114I are guaranteed functional over the temperature range of –40°C to 85°C. Note 12: The LT1112AC/LT1112C/LT1112S8/LT1114AC/LT1114C/ LT1114S are guaranteed to meet specified performance from 0°C to 70°C and are designed, characterized and expected to meet specified performance from –40°C to 85°C, but are not tested or QA sampled at these temperatures. The LT1112I/LT1114I are guaranteed to meet specified performance from –40°C to 85°C. U W TYPICAL PERFOR A CE CHARACTERISTICS Input Bias Current Over Common Mode Range 100 ∆IB+ IOS 0 –100 IB (UNDERCANCELLED) IB (OVERCANCELLED) 30 VS = ±15V TA = 25°C RINCM = 800GΩ 50 DEVICE WITH POSITIVE INPUT CURRENT 0 DEVICE WITH NEGATIVE INPUT CURRENT –50 – IB –100 VS = ±15V –200 –75 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 –150 –15 0 200 –300 –200 –100 0 100 INPUT BIAS CURRENT (pA) 15 25 VS = ±15V 20 10 5 960 OP AMPS TESTED 240 LT1112S8 80 LT1114N 40 LT1114S Distribution of Offset Voltage at VS = ±1.0V (In All Packages) LT1112/14 • TPC04 30 VS = ±15V TA = 25°C 25 15 10 5 0 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C) 300 LT1112/14 • TPC03 Drift with Temperature LT1112S8, LT1114N/S PERCENT OF UNITS PERCENT OF INPUTS 15 10 LT1112/14 • TPC02 Drift with Temperature LT1112N8/J8, LT1114J 850 OP AMPS TESTED 100 LT1112J8 165 LT1112N8 80 LT1114J 20 + 10 –5 0 5 –10 COMMON MODE INPUT VOLTAGE (V) LT1112/14 • TPC01 20 VS = ±15V TA = 25°C VCM PERCENT OF UNITS 100 Distribution of Input Bias Current (In All Packages Except LT1114S) PERCENT OF UNITS 150 200 INPUT BIAS CURRENT (pA) INPUT BIAS, OFFSET, MATCH CURRENT (pA) Input Bias and Offset Current, Noninverting Bias Current Match vs Temperature 20 15 10 5 0 –1.4 –1.0 –0.6 –0.2 0.2 0.6 1.0 1.4 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C) LT1112/14 • TPC05 0 –80 –60 –40 –20 0 20 40 60 80 100 INPUT OFFSET VOLTAGE (µV) LT1112/14 • TPC06 111214fb 6 LT1112/LT1114 U W TYPICAL PERFOR A CE CHARACTERISTICS Distribution of Offset Voltage Match Drift (LT1112J8, LT1112N8, LT1114J Packages) Distribution of Offset Voltage Match 25 30 VS = ±15V TA = 25°C VS = ±15V 364 PAIRS TESTED 15 10 PERCENT OF UNITS 15 PERCENT ON UNITS PERCENT OF UNITS 20 VS = ±15V 342 PAIRS TESTED 25 20 Distribution of Offset Voltage Match Drift (LT1112S8, LT1114N, LT1114S Packages) 20 15 10 10 5 5 5 0 –100 –80 –60 – 40 –20 0 20 40 60 80 100 ∆VOS, OFFSET VOLTAGE MATCH (µV) 0 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 OFFSET VOLTAGE MATCH DRIFT (µV/°C) LT1112/14 • TPC08 LT1112/14 • TPC07 Noise Spectrum 0.1Hz to 10Hz Noise VS = ±1V TO ±20V TA = 25°C VS = ±15V TA = 25°C CURRENT NOISE VOLTAGE NOISE 10 1/fCORNER 2.5Hz 0.01Hz to 1Hz Noise VS = ±15V TA = 25°C 1/fCORNER 140Hz NOISE VOLTAGE (0.2µV/DIV) 100 LT1112/14 • TPC09 NOISE VOLTAGE (0.2µV/DIV) VOLTAGE NOISE DENSITY (nV/√Hz) CURRENT NOISE DENSITY (fA/√Hz) 1000 0 –1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2 1.6 OFFSET VOLTAGE MATCH DRIFT (µV/°C) 1 10 100 FREQUENCY (Hz) 1000 2 0 6 4 TIME (SEC) LT1112/14 • TPC10 LT1112S8, LT1114N/S PACKAGES LT1114J PACKAGE LT1112J8, N8 PACKAGES 0 0 0.5 1.0 1.5 2.0 TIME AFTER POWER ON (MINUTES) 2.5 LT1112/14 • TPC13 CHANGE IN OFFSET VOLTAGE (µV) CHANGE IN OFFSET VOLTAGE (µV) 6 2 20 60 40 TIME (SEC) Supply Current per Amplifier vs Supply Voltage 2A 3A 2 2B 0 1A 3B –2 1B –4 –6 0 1 100 600 VS = ±15V TA = 25°C 4 80 LT1112/14 • TPC12 Long Term Stability of Three Representative Units VS = ±15V TA = 25°C 1 0 10 LT1112/14 • TPC11 Warm-Up Drift 3 8 SUPPLY CURRENT PER AMPLIFIER (µA) 1 2 3 4 TIME (MONTHS) 5 6 LT1112/14 • TPC14 500 400 TA = 125°C TA = 25°C 300 TA = –55°C 200 0 ±10 ±15 ±5 SUPPLY VOLTAGE (V) ±20 LT1112/14 • TPC15 111214fb 7 LT1112/LT1114 U W Common Mode Range and Voltage Swing with Respect to Supply Voltages Minimum Supply Voltage vs Temp Voltage Gain at Minimum Supply Voltage ±1.1 ±1.0 ±0.9 100 80 60 40 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 V+ + V – 0.2 V+ VS = ±1V TO ±20V IL < 100µA V+ – 1 V + – 0.4 SWING V + – 0.6 V + – 0.8 CM RANGE V + – 1.0 V – + 0.8 SWING V – + 0.6 CM RANGE V – + 0.4 V– –75 125 V– + 3 V– + 2 V– 125 –25 75 25 TEMPERATURE (°C) –9 –6 SINK 0 3 LT1112/14 • TPC18 Voltage Gain vs Frequency 140 VS = ±15V TA = 25°C Gain, Phase Shift vs Frequency 40 VS = ±15V TA = 25°C 120 100 VS = ±15V TA = 25°C RL = 10k 0 RL = 2k 5 120 100 PHASE 80 GAIN (dB) VOLTAGE GAIN (dB) 30 –5 60 40 20 10 20 140 GAIN 10 160 0 –10 –5 0 5 OUTPUT VOLTAGE (V) 10 15 –20 0.01 0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 180 PHASE MARGIN = 70°C 0 15 –15 9 6 SOURCE OUTPUT CURRENT (mA) –3 PHASE SHIFT (DEG) CHANGE IN OFFSET VOLTAGE (µV) V+ – 3 LT1112/14 • TPC17 Voltage Gain –10 VS = ±1V TO ± 20V TA = 25°C MAX IL AT ±1V = 1.3mA AT ±1.5V = 3mA V+ – 2 V– + 1 V – + 0.2 LT1112/14 • TPC16 –15 Output Voltage Swing vs Load Current OUTPUT SWING (V) ±1.2 COMMON MODE RANGE OR OUTPUT SWING (V) VOLTAGE GAIN (V/mV) MINIMUM SUPPLY (V) TYPICAL PERFOR A CE CHARACTERISTICS –10 0.01 200 0.1 1 10 FREQUENCY (MHz) LT1112/14 • TPC21 LT1112/14 • TPC19 LT1112/14 • TPC20 Common Mode Rejection vs Frequency Channel Separation vs Frequency 160 140 POWER SUPPLY REJECTION RATIO (dB) VS = ±15V TA = 25°C 120 100 80 60 40 20 0 1 10 10k 1k 100 FREQUENCY (Hz) 100k 1M LT1112/14 • TPC22 VS = ±15V TA = 25°C VS = ±15V TA = 25°C 120 CHANNEL SEPARATION (dB) 140 COMMON MODE REJECTION RATIO (dB) Power Supply Rejection vs Frequency NEGATIVE SUPPLY 100 80 POSITIVE SUPPLY 60 140 120 100 AMP 1 IN UNITY-GAIN 20VP-P, RL = 2k AMP 2 IN GAIN = 1000 RS = 100Ω, RF = 100k 40 80 20 0.1 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M LT1112/14 • TPC23 1 10 1k 100 10k FREQUENCY (Hz) 100k 1M LT1112/14 • TPC24 111214fb 8 LT1112/LT1114 U W TYPICAL PERFOR A CE CHARACTERISTICS 1000 φm 70 800 60 GBW 700 600 –50 –25 VS = ±15V TA = 25°C 100 80 0.2 120 100 10 AV = 100 OVERSHOOT (%) SLEW OUTPUT IMPEDANCE (Ω) GAIN-BANDWIDTH PRODUCT (kHz) 0.3 Capacitive Loading Handling Closed-Loop Output Impedance 0.4 PHASE MARGIN (DEG) SLEW RATE (V/µs) Slew Rate, Gain-Bandwidth Product and Phase Margin vs Temperature AV = +1 1 0.1 100 0.001 125 80 60 AV = +1 40 AV = 10 0.01 50 25 0 75 TEMPERATURE (°C) VS = ±15V TA = 25°C 20 1 10 100 1k 10k FREQUENCY (Hz) 100k 0 0.1 0.00001 0.0001 0.001 0.01 CAPACITIVE LOAD (µF) 1M LT1112/14 • TPC26 LT1112/14 • TPC25 Small-Signal Transient Response 1 10 LT1112/14 • TPC27 Undistorted Output Voltage vs Frequency Large-Signal Transient Response PEAK-TO-PEAK OUTPUT VOLTAGE (V) 5V/DIV 20mV/DIV 28 50µs/DIV 2µs/DIV AV = +1 CL = 500pF VS = ±15V AV = +1 RF = 10k CF = 100pF VS = ±15V TA = 25°C RL = 10k 24 VS = ±15V 20 16 12 8 VS = ±5V 4 0 1 10 100 FREQUENCY (kHz) 1000 LT1112/14 • TPC30 111214fb 9 LT1112/LT1114 U W U U APPLICATIO S I FOR ATIO The LT1112 dual and LT1114 quad in the plastic and ceramic DIP packages are pin compatible to and directly replace such precision op amps as the OP-200, OP-297, AD706 duals and OP-400, OP-497, AD704 quads with improved price/performance. The LT1112 in the S8 surface mount package has the standard pin configuration, i.e., the same configuration as the plastic and ceramic DIP packages. The LT1114 quad is offered in the narrow 16-pin surface mount package. All competitors are in the wide 16-pin package which occupies 1.8 times the area of the narrow package. The wide package is also 1.8 times thicker than the narrow package. The inputs of the LT1112/1114 are protected with back-toback diodes. In the voltage follower configuration, when the input is driven by a fast large-signal pulse (>1V), the input protection diodes effectively short the output to the input during slewing, and a current, limited only by the output short-circuit protection, will flow through the diodes. The use of a feedback resistor is recommended because this resistor keeps the current below the short-circuit limit, resulting in faster recovery and settling of the output. The input voltage of the LT1112/1114 should never exceed the supply voltages by more than a diode drop. However, the example below shows that as the input voltage exceeds the common mode range, the LT1112’s output clips cleanly, without any glitches or phase reversal. The OP-297 exhibits phase reversal. The photos also illustrate that both the input and output ranges of the LT1112 are within 800mV of the supplies. The effect of input and output overdrive on the other amplifiers in the LT1112 or LT1114 packages is negligible, as each amplifier is biased independently. Advantages of Matched Dual and Quad Op Amps In many applications the performance of a system depends on the matching between two operational amplifiers rather than the individual characteristics of the two op amps. Two or three op amp instrumentation amplifiers, tracking voltage references and low drift active filters are some of the circuits requiring matching between two op amps. The well-known triple op amp configuration illustrates these concepts. Output offset is a function of the difference between the offsets of the two halves of the LT1112. This error cancellation principle holds for a considerable number of input referred parameters in addition to offset voltage and its drift with temperature. Input bias current will be the average of the two noninverting input currents (IB+). The difference between these two currents (∆IB+) is the offset current of the instrumentation amplifier. Common mode and power supply rejections will be dependent only on the match between the two amplifiers (assuming perfect resistor matching). Voltage Follower with Input Exceeding the Common Mode Range (VS = ±5V) INPUT: ±5.2V Sine Wave LT1112 Output OP-297 Output 111214fb 10 LT1112/LT1114 U W U U APPLICATIO S I FOR ATIO Three Op Amp Instrumentation Amplifier IN– R4 100Ω 0.5% + 1/2 LT1112 OR 1/4 LT1114 – A R1 10k 1% R8 200Ω IN+ 1/2 LT1112 OR 1/4 + LT1114 D Input offset voltage = 35µV Offset voltage drift = 0.3µV/°C Input bias current = 80pA Input offset current = 100pA Input resistance = 800GΩ Input noise = 0.42µVP-P R6 10k 0.5% – R3 2.1k 1% – Typical performance of the instrumentation amplifier: C1 33pF R10 1M R2 R5 10k 100Ω 1% 0.5% LT1097 OR 1/4LT1114 +B OR C OUTPUT GAIN = 1000 R7 9.88k 0.5% TRIM R8 FOR GAIN TRIM R9 FOR DC COMMON MODE REJECTION TRIM R10 FOR AC COMMON MODE REJECTION R9 200Ω LT1112/14 • AI02 The concepts of common mode and power supply rejection ratio match (∆CMRR and ∆PSRR) are best demonstrated with a numerical example: Assume CMRRA = + 1µV/V or 120dB, and CMRRB = + 0.75µV/V or 122.5dB, then ∆CMRR = 0.25µV/V or 132dB; if CMRRB = – 0.75µV/V which is still 122.5dB, then ∆CMRR = 1.75µV/V or 115dB. When the instrumentation amplifier is used with high impedance sources, the LT1114 is recommended because its CMRR vs frequency performance is better than the LT1112’s. For example, with two matched 1MΩ source resistors, CMRR at 100Hz is 100dB with the LT1114, 76dB with the LT1112. This difference is explained by the fact that capacitance between adjacent pins on an IC package is about 0.25pF (including package, socket and PC board trace capacitances). On the dual op amp package, positive input A is next to the V – pin (AC ground), while positive input B has no AC ground pin adjacent to it, resulting in a 0.25pF input capacitance mismatch. At 100Hz, 0.25pF represents a 6.4 • 109 input impedance mismatch, which is only 76dB higher than the 1MΩ source resistors. On the quad package, all four inputs are adjacent to a power supply terminal—therefore, there is no mismatch. Clearly the LT1112/LT1114, by specifying and guaranteeing all of these matching parameters, can significantly improve the performance of matching-dependent circuits. 111214fb 11 LT1112/LT1114 W W SCHE ATIC DIAGRA 12pF 30k (1/2 LT1112, 1/4 LT1114) V+ 20µA 30k 35µA Q35 Q34 Q19 Q22 30pF 800Ω 80µA 1.5k 4k Q33 Q21 Q6 Q5 Q25 Q27 Q29 S Q8 Q4 Q24 28Ω Q7 3k 90Ω OUT Q13 Q11 Q23 INVERTING INPUT S – 2.5k S Q1 Q2 Q20 S Q3 50k 1.5k Q26 J1 30Ω Q28 Q32 Q9 NONINVERTING INPUT Q12 Q16 10k Q18 Q10 + Q30 Q17 460Ω Q31 15µA 5µA Q14 Q15 5µA V– 200Ω 460Ω 200Ω 460Ω Q1 TO Q4 ARE SUPERGAIN TRANSISTORS LT1112/14 • SD01 111214fb 12 LT1112/LT1114 U PACKAGE DESCRIPTIO J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) .405 (10.287) MAX .005 (0.127) MIN .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .045 – .068 (1.143 – 1.650) FULL LEAD OPTION 8 6 7 5 .025 (0.635) RAD TYP .220 – .310 (5.588 – 7.874) 1 2 3 4 .300 BSC (7.62 BSC) .200 (5.080) MAX .015 – .060 (0.381 – 1.524) .008 – .018 (0.203 – 0.457) 0° – 15° .045 – .065 (1.143 – 1.651) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .014 – .026 (0.360 – 0.660) .125 3.175 MIN .100 (2.54) BSC J8 0801 J Package 14-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) .005 (0.127) MIN .785 (19.939) MAX 14 13 12 11 10 9 8 .220 – .310 (5.588 – 7.874) .025 (0.635) RAD TYP 1 2 3 4 5 6 7 .300 BSC (7.62 BSC) .200 (5.080) MAX .015 – .060 (0.381 – 1.524) .008 – .018 (0.203 – 0.457) 0° – 15° .045 – .065 (1.143 – 1.651) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .014 – .026 (0.360 – 0.660) .100 (2.54) BSC .125 (3.175) MIN J14 0801 OBSOLETE PACKAGES 111214fb 13 LT1112/LT1114 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 .100 (2.54) BSC (0.457 ± 0.076) N8 1002 NOTE: 1. DIMENSIONS ARE INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) N Package 14-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .770* (19.558) MAX 14 13 12 11 10 9 8 1 2 3 4 5 6 7 .255 ± .015* (6.477 ± 0.381) .130 ± .005 (3.302 ± 0.127) .300 – .325 (7.620 – 8.255) .045 – .065 (1.143 – 1.651) .020 (0.508) MIN .065 (1.651) TYP .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE ) .120 (3.048) MIN .005 (0.127) .100 MIN (2.54) BSC .018 ± .003 (0.457 ± 0.076) N14 1103 INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) 111214fb 14 LT1112/LT1114 U PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 7 8 .245 MIN 5 6 .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) 3 2 4 .053 – .069 (1.346 – 1.752) .008 – .010 (0.203 – 0.254) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) .050 (1.270) BSC .014 – .019 (0.355 – 0.483) TYP 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) SO8 0303 S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .386 – .394 (9.804 – 10.008) NOTE 3 .045 ±.005 .050 BSC 16 N 15 14 13 12 11 10 9 N .245 MIN .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) 1 .030 ±.005 TYP 2 3 N/2 N/2 RECOMMENDED SOLDER PAD LAYOUT 1 .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) 2 3 4 5 6 7 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0° – 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1. DIMENSIONS IN .014 – .019 (0.355 – 0.483) TYP 8 .050 (1.270) BSC S16 0502 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) 111214fb 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. 15 LT1112/LT1114 U TYPICAL APPLICATIO Dual Buffered ±0.617V Reference Powered by Two AA Batteries +1.5V RX* 15k 3 *OPTIONAL 8 + 1/2 LT1112 2 1 0.617V – 20k 0.1% LT1004-1.2 100pF – 6 1/2 LT1112 RY* + 7 4 5 TOTAL SUPPLY CURRENT = 700µA WORKS WITH BATTERIES DISCHARGED TO ±1.3V AT ±1.5V: MAXIMUM LOAD CURRENT = 800µA; CAN BE INCREASED WITH OPTIONAL RX, RY; AT RX = RY = 750Ω LOAD CURRENT = 2mA TEMPERATURE COEFFICIENT LIMITED BY REFERENCE = 20ppm/°C 20k 0.1% *OPTIONAL –1.5V –0.617V LT1112/14 • TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1880 Rail-to-Rail Output, Picoamp Input Precision Op Amp SOT-23 LT1881/LT1882 Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amp CLOAD Up to 1000pF LT1884/LT1885 Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amp 9.5nV/√Hz Input Noise LT6011/LT6012 Dual/Quad Rail-to-Rail Output, Picoamp Input Precision Op Amp 135µA Supply Current, 14nV/√Hz 111214fb 16 Linear Technology Corporation LT 0207 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 1992