LT1056CH

LT1055/LT1056 Precision, High Speed, JFET Input Operational Amplifiers FEATURES DESCRIPTION Guaranteed Offset Voltage: 150µV Max –55°C to 125°C: 500µV Max nn Guaranteed Drift: 4µV/°C Max nn Guaranteed Bias Current 70°C: 150pA Max 125°C: 2.5nA Max nn Guaranteed Slew Rate: 12V/µs Min nn Available in 8-Pin PDIP and SO Packages The LT®1055/LT1056 JFET input operational amplifiers combine precision specifications with high speed performance. nn For the first time, 16V/µs slew rate and 6.5MHz gain bandwidth product are simultaneously achieved with offset voltage of typically 50µV, 1.2µV/°C drift, bias currents of 40pA at 70°C and 500pA at 125°C. The 150µV maximum offset voltage specification is the best available on any JFET input operational amplifier. APPLICATIONS The LT1055 and LT1056 are differentiated by their operating currents. The lower power dissipation LT1055 achieves lower bias and offset currents and offset voltage. The additional power dissipation of the LT1056 permits higher slew rate, bandwidth and faster settling time with a slight sacrifice in DC performance. Precision, High Speed Instrumentation nn Logarithmic Amplifiers nn D/A Output Amplifiers nn Photodiode Amplifiers nn Voltage-to-Frequency Converters nn Frequency-to-Voltage Converters nn Fast, Precision Sample-and-Hold nn The voltage-to-frequency converter shown below is one of the many applications which utilize both the precision and high speed of the LT1055/LT1056. For a JFET input op amp with 23V/µs guaranteed slew rate, refer to the LT1022 data sheet. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Distribution of Input Offset Voltage (H Package) 1Hz to 10kHz Voltage-to-Frequency Converter 4.7k 3M 15V 140 0.001 (POLYSTYRENE) 75k 2 0.1µF 2N3906 3.3M 3 – LT1056 + 33pF 6 1.5k OUTPUT 1Hz TO 10kHz 0.005% LINEARITY 4 –15V LM329 –15V 100 50% TO ±60µV 80 60 40 0 THE LOW OFFSET VOLTAGE OF LT1056 CONTRIBUTES ONLY 0.1Hz OF ERROR WHILE ITS HIGH SLEW RATE PERMITS 10kHz OPERATION. VS = ±15V TA = 25°C 634 UNITS TESTED FROM THREE RUNS 20 0.1µF = 1N4148 *1% FILM 22k 15V 7 NUMBER OF UNITS 0V TO 10V INPUT 10kHz TRIM 5k 120 –400 –200 200 400 0 INPUT OFFSET VOLTAGE (µV) LT1055/56 TA02 LT1055/56 TA01 10556fd For more information www.linear.com/LT1055 1 LT1055/LT1056 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage ........................................................±20V Differential Input Voltage.........................................±40V Input Voltage ...........................................................±20V Output Short-Circuit Duration........................... Indefinite Operating Temperature Range LT1055AM/LT1055M/LT1056AM/ LT1056M (OBSOLETE)....................... –55°C to 125°C LT1055AC/LT1055C/LT1056AC/ LT1056C................................................... 0°C to 70°C Storage Temperature Range All Devices.......................................... –65°C to 150°C Lead Temperature (Soldering, 10 sec).................... 300°C PIN CONFIGURATION TOP VIEW TOP VIEW BAL 1 8 N/C BAL 1 8 N/C –IN 2 7 V+ –IN 2 7 V+ +IN 3 6 OUT +IN 3 6 OUT BAL – 5 BAL V – 4 5 V N8 PACKAGE 8-LEAD PDIP TJMAX = 150°C, θJA = 130°C/W 4 S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 130°C/W TOP VIEW NC BALANCE 1 –IN 2 8 7 V+ 6 OUT 5 BALANCE 4 V– H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 150°C, θJA = 150°C/W, θJC = 45°C/W +IN 3 OBSOLETE PACKAGE Consider the N8 for Alternate Source 10556fd 2 For more information www.linear.com/LT1055 LT1055/LT1056 ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1055CN8#PBF LT1055CN8#TRPBF LT1055CN8 8-Lead PDIP 0°C to 70°C LT1056CN8#PBF LT1056CN8#TRPBF LT1056CN8 8-Lead PDIP 0°C to 70°C LT1055S8#PBF LT1055S8#TRPBF 1055 8-Lead Plastic SO 0°C to 70°C LT1056S8#PBF LT1056S8#TRPBF 1056 8-Lead Plastic SO 0°C to 70°C LT1055ACH#PBF LT1055ACH#TRPBF LT1055ACH 8-Lead TO-5 Metal Can 0°C to 70°C LT1055CH#PBF LT1055CH#TRPBF LT1055CH 8-Lead TO-5 Metal Can 0°C to 70°C LT1055AMH#PBF LT1055AMH#TRPBF LT1055AMH 8-Lead TO-5 Metal Can –55°C to 125°C LT1055MH#PBF LT1055MH#TRPBF LT1055MH 8-Lead TO-5 Metal Can –55°C to 125°C LT1056ACH#PBF LT1056ACH#TRPBF LT1056ACH 8-Lead TO-5 Metal Can 0°C to 70°C LT1056CH#PBF LT1056CH#TRPBF LT1056CH 8-Lead TO-5 Metal Can 0°C to 70°C LT1056AMH#PBF LT1056AMH#TRPBF LT1056AMH 8-Lead TO-5 Metal Can –55°C to 125°C LT1056MH#PBF LT1056MH#TRPBF LT1056MH 8-Lead TO-5 Metal Can –55°C to 125°C OBSOLETE PACKAGE Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part markings, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS TA = 25°C. VS = ±15V, VCM = 0V unless otherwise noted. LT1055AM/LT1056AM LT1055AC/LT1056AC SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 2) IOS IB TYP MAX TYP MAX UNITS LT1055 H Package LT1056 H Package LT1055 N8 Package LT1056 N8 Package 50 50 150 180 70 70 120 140 400 450 700 800 µV µV µV µV Input Offset Current Fully Warmed Up 2 10 2 20 pA Input Bias Current Fully Warmed Up VCM = 10V ±10 30 ±50 130 ±10 30 ±50 150 pA pA Common Mode VCM = –11V to 8V VCM = 8V to 11V 1012 1012 1011 4 1012 1012 1011 4 Ω Ω Ω pF Input Noise Voltage 0.1Hz to 10Hz 1.8 2.5 2.0 2.8 µVP-P µVP-P Input Noise Voltage Density fO = 10Hz (Note 3) fO = 1kHz (Note 4) Input Resistance:Differential Input Capacitance en MIN LT1055M/LT1056M LT1055CH/LT1056CH LT1055CN8/LT1056CN8 LT1055 LT1056 In Input Noise Current Density fO = 10Hz, 1kHz (Note 5) AVOL Large-Signal Voltage Gain VO = ±10V RL = 2k RL = 1k Input Voltage Range 28 14 50 20 1.8 4 MIN 30 15 60 22 nV/√Hz nV/√Hz 1.8 4 fA/√Hz 150 130 400 300 120 100 400 300 V/mV V/mV ±11 ±12 ±11 ±12 V 86 100 83 98 dB CMRR Common Mode Rejection Ratio VCM = ±11V PSRR Power Supply Rejection Ratio VS = ±10V to ±18V 90 106 88 104 dB VOUT Output Voltage Swing RL = 2k ±12 ±13.2 ±12 ±13.2 V 10556fd For more information www.linear.com/LT1055 3 LT1055/LT1056 ELECTRICAL CHARACTERISTICS TA = 25°C. VS = ±15V, VCM = 0V unless otherwise noted.t LT1055AM/LT1056AM LT1055AC/LT1056AC SYMBOL PARAMETER CONDITIONS MIN TYP SR Slew Rate LT1055 LT1056 10 12 13 16 GBW Gain Bandwidth Product f = 1MHz LT1055 LT1056 5.0 6.5 IS Supply Current LT1055 LT1056 2.8 5.0 Offset Voltage Adjustment Range RPOT = 100k MAX LT1055M/LT1056M LT1055CH/LT1056CH LT1055CN8/LT1056CN8 TYP 7.5 9.0 12 14 V/µs V/µs 4.5 5.5 MHz MHz 4.0 6.5 2.8 5.0 ±5 MAX UNITS MIN 4.0 7.0 ±5 mA mA mV The l denotes the specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C. VS = ±15V, VCM = 0V unless otherwise noted. LT1055AC LT1056AC MIN LT1055CH/LT1056CH LT1055CN8/LT1056CN8 SYMBOL PARAMETER CONDITIONS TYP MAX TYP MAX UNITS VOS Input Offset Voltage (Note 2) LT1055 H Package LT1056 H Package LT1055 N8 Package LT1056 N8 Package l l l l 100 100 330 360 140 140 250 280 750 800 1250 1350 µV µV µV µV Average Temperature Coefficient of Input Offset Voltage H Package (Note 6) N8 Package (Note 6) l l 1.2 4.0 1.6 3.0 8.0 12.0 µV/°C µV/°C IOS Input Offset Current Warmed Up TA = 70°C LT1055 LT1056 l l 10 14 50 70 16 18 80 100 pA pA IB Input Bias Current Warmed Up TA = 70°C LT1055 LT1056 l l ±30 ±40 ±150 ±80 ±40 ±50 ±200 ±240 pA pA AVOL Large-Signal Voltage Gain VO = ±10V, RL = 2k l 80 250 60 250 V/mV CMRR l 85 100 82 98 dB PSRR Common Mode Rejection Ratio VCM = ±10.5V Power Supply Rejection Ratio VS = ±10V to ±18V l 89 105 87 103 dB VOUT Output Voltage Swing l ±12 ±13.1 ±12 ±13.1 V RL = 2k MIN The l denotes the specifications which apply over the temperature range –55°C ≤ TA ≤ 125°C. VS = ±15V, VCM = 0V, unless otherwise noted. LT1055AM LT1056AM SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 2) Average Temperature Coefficient of Input Offset Voltage (Note 6) IOS Input Offset Current Warmed Up TA = 125°C IB Input Bias Current Warmed Up TA = 125°C AVOL Large-Signal Voltage Gain VO = ±10V, RL = 2k l 40 120 35 120 V/mV CMRR l 85 100 82 98 dB PSRR Common Mode Rejection Ratio VCM = ±10.5V Power Supply Rejection Ratio VS = ±10V to ±17V l 88 104 86 102 dB VOUT Output Voltage Swing l ±12 ±12.9 ±12 ±12.9 RL = 2k MIN LT1055M LT1056M TYP MAX l l 180 180 l LT1055 LT1056 LT1055 LT1056 LT1055 LT1056 TYP MAX UNITS 500 550 250 250 1200 1250 µV µV 1.3 4.0 1.8 8.0 µV/°C l l 0.20 0.25 1.2 1.5 0.25 0.30 1.8 2.4 nA nA l l ±0.4 ±0.5 ±2.5 ±3.0 ±0.5 ±0.6 ±4.0 ±5.0 nA nA MIN V 10556fd 4 For more information www.linear.com/LT1055 LT1055/LT1056 ELECTRICAL CHARACTERISTICS TA = 25°C. VS = ±15V, VCM = 0V unless otherwise noted. LT1055CS8/LT1056CS8 SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 2) IOS Input Offset Current IB Input Bias Current Input Resistance Differential Common Mode MIN TYP MAX UNITS 500 1500 µV Fully Warmed Up 5 30 pA Fully Warmed Up VCM = 10V ±30 30 ±100 150 pA pA VCM = –11V to 8V VCM = 8V to 11V 0.4 0.4 0.05 TΩ TΩ TΩ 4 pF Input Capacitance Input Noise Voltage 0.1Hz to 10Hz Input Noise Voltage Density fO = 10Hz (Note 4) fO = 1kHz (Note 4) 35 15 70 22 nV/√Hz nV/√Hz in Input Noise Current Density fO = 10Hz, 1kHz (Note 5) 2.5 10 fA/√Hz AVOL Large-Signal Voltage Gain VO = ±10V en LT1055 LT1056 2.5 3.5 RL = 2k RL = 1k Input Voltage Range CMRR Common Mode Rejection Ratio VCM = ±11V µVP-P µVP-P 120 100 400 300 V/mV V/mV ±11 ±12 V 83 98 dB PSRR Power Supply Rejection Ratio VS = ±10V to ±18V 88 104 dB VOUT Output Voltage Swing RL = 2K ±12 ±13.2 V SR Slew Rate LT1055 LT1056 7.5 9.0 12 14 V/µs V/µs GBW Gain Bandwidth Product f = 1MHz LT1055 LT1056 4.5 5.5 MHz MHz IS Supply Current LT1055 LT1056 2.8 5.0 Offset Voltage Adjustment Range RPOT = 100k 4.0 7.0 ±5 mA mA mV The l denotes the specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C. VS = ±15V, VCM = 0V unless otherwise noted. LT1055CS8/LT1056CS8 SYMBOL PARAMETER VOS TYP MAX UNITS Input Offset Voltage (Note 2) CONDITIONS l MIN 800 2200 µV Average Temperature Coefficient of Input Offset Voltage l 4 15 µV/°C IOS Input Offset Current Warmed Up, TA = 70°C l 18 150 pA IB Input Bias Current Warmed Up, TA = 70°C l ±60 ±400 pA AVOL Large-Signal Voltage Gain VO = ±10V, RL = 2k l 60 CMRR Common Mode Rejection Ratio VCM = ±10.5V l PSRR Power Supply Rejection Ratio VS = ±10V to ±18V l VOUT Output Voltage Swing RL = 2K l 250 V/mV 82 98 dB 87 103 dB ±12 ±13.1 V 10556fd For more information www.linear.com/LT1055 5 LT1055/LT1056 ELECTRICAL CHARACTERISTICS For MIL-STD components, please refer to LTC883 data sheet for test listing and parameters. 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: Offset voltage is measured under two different conditions: (a) approximately 0.5 seconds after application of power; (b) at TA = 25°C only, with the chip heated to approximately 38°C for the LT1055 and to 45°C for the LT1056, to account for chip temperature rise when the device is fully warmed up. Note 3: 10Hz noise voltage density is sample tested on every lot of A grades. Devices 100% tested at 10Hz are available on request. Note 4: This parameter is tested on a sample basis only. Note 5: Current noise is calculated from the formula: in = (2qlB)1/2, where q = 1.6 • 10–19 coulomb. The noise of source resistors up to 1GΩ swamps the contribution of current noise. Note 6: Offset voltage drift with temperature is practically unchanged when the offset voltage is trimmed to zero with a 100k potentiometer between the balance terminals and the wiper tied to V+. Devices tested to tighter drift specifications are available on request. TYPICAL PERFORMANCE CHARACTERISTICS BIAS OR OFFSET CURRENTS MAY BE POSITIVE OR NEGATIVE 100 BIAS CURRENT 30 10 3 OFFSET CURRENT 0 25 75 100 50 AMBIENT TEMPERATURE (°C) 125 80 800 TA = 125°C 40 A –40 B –120 –15 B TA = 125°C A = POSITIVE INPUT CURRENT B = NEGATIVE INPUT CURRENT –5 0 5 10 –10 COMMON MODE INPUT VOLTAGE (V) 100 80 60 40 20 15 *DISTRIBUTION IN THE PLASTIC (N8) PACKAGE IS SIGNIFICANTLY WIDER. 50% YIELD TO ±140µV 80 60 40 20 –1200 0 –800 –600 –400 –200 0 200 400 600 800 INPUT OFFSET VOLTAGE (µV) LT1055/56 G03 Long Term Drift of Representative Units 100 50 VS = ±15V TA = 25°C 80 60 LT1056CN8 40 LT1055CN8 LT1056 H PACKAGE 20 0 0 VS = ±15V TA = 25°C 40 LT1055 H PACKAGE 0 –10 –8 –6 –4 –2 0 2 4 6 8 10 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C) VS = ±15V TA = 25°C 550 UNITS TESTED FROM 120 TWO RUNS (LT1056) 100 140 Warm-Up Drift CHANGE IN OFFSET VOLTAGE (µV) BATTERY VOLTAGE (V) 120 50% TO ±1.5µV/°C –800 160 LT1055/56 G02 Distribution of Offset Voltage Drift with Temperature (H Package)* VS = ±15V 634 UNITS TESTED FROM THREE RUNS 0 –400 TA = 70°C –80 400 TA = 25°C A 0 TA = 70°C LT1055/56 G01 140 1200 VS = ±15V WARMED UP NUMBER OF INPUTS 300 120 OFFSET VOLTAGE CHANGE (µV) VS = ±15V VCM = 0V WARMED UP Distribution of Input Offset Voltage (N8 Package) INPUT BIAS CURRENT, TA = 125°C (pA) INPUT BIAS AND OFFSET CURRENT (pA) 1000 Input Bias Current Over the Common Mode Range INPUT BIAS CURRENT, TA = 25°C, TA = 70°C (pA) Input Bias and Offset Currents vs Temperature 1 3 4 2 TIME AFTER POWER ON (MINUTES) 30 20 10 0 –10 –20 –30 –40 5 LT1055/56 G05 –50 0 1 3 2 TIME (MONTHS) 4 5 LT1055/56 GO6 LT1055/56 G04 10556fd 6 For more information www.linear.com/LT1055 LT1055/LT1056 TYPICAL PERFORMANCE CHARACTERISTICS LT1056 LT1055 0 2 6 4 TIME (SECONDS) 8 10 Voltage Noise vs Frequency 100 7 70 PEAK-TO-PEAK NOISE 5 3 50 30 fO = 10kHz 2 20 fO = 1kHz 1 10 20 30 50 60 40 CHIP TEMPERATURE (°C) 70 LT1055/56 GO7 1000 RMS NOISE VOLTAGE DENSITY (nV/√Hz) 0.1Hz TO 10Hz PEAK-TO-PEAK NOISE (µV/P-P) Noise vs Chip Temperature 10 RMS NOISE VOLTAGE DENSITY (nV/√Hz) NOISE VOLTAGE (1µV/DIVISION) 0.1Hz to 10Hz Noise 300 100 LT1056 1/f CORNER = 28HZ 30 10 10 80 VS = ±15V TA = 25°C LT1055 1/f CORNER = 20HZ 1 3 10 100 30 FREQUENCY (Hz) LT1055/56 G09 LT1055/56 G08 LT1055 Large-Signal Response 20mV/DIV 5V/DIV Small-Signal Response 5V/DIV LT1056 Large-Signal Response 1000 300 AV = 1, CL = 100pf, 0.5µs/DIV AV = 1, CL = 100pf, 0.5µs/DIV LT1055/56 G10 LT1055/56 G12 AV = 1, CL = 100pf, 0.2µs/DIV LT1055/56 G11 VS = ±15V TA = 25°C 18 12 LT1055 8 LT1056 GBW SLEW RATE (V/µS) 24 Output Impedance vs Frequency LT1056 LT1055 GBW 20 6 4 10 LT1056 SLEW 2 LT1055 SLEW 6 0 0.1 1 FREQUENCY (MHz) 10 LT1055/56 G13 0 100 10 30 VS = ±15V fO = 1MHz FOR GBW –25 25 75 TEMPERATURE (°C) 125 LT1055/56 G14 GAIN BANDWIDTH PRODUCT (MHz) PEAK-TO-PEAK OUTPUT SWING (V) 30 Slew Rate, Gain Bandwidth vs Temperature OUTPUT IMPEDANCE (Ω) Undistorted Output Swing vs Frequency VS = ±15V TA = 25°C AV = 100 LT1055 LT1056 10 AV = 10 LT1055 1 LT1056 LT1055 LT1056 AV = 1 0.1 1 10 100 FREQUENCY (kHz) 1000 LT1055/56 G15 10556fd For more information www.linear.com/LT1055 7 LT1055/LT1056 TYPICAL PERFORMANCE CHARACTERISTICS Gain, Phase Shift vs Frequency VS = ±15V TA = 25°C 20 40 GAIN (dB) GAIN LT1056 LT1055 0 20 1 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) –10 4 2 FREQUENCY (MHz) 1 6 LT1055/56 G16 1mV 5mV 2mV –5 –10 0.5mV 5mV 0 10mV 1mV 0.5mV VS = ±15V TA = 25°C 1 0 2 Common Mode Range vs Temperature 10mV 5 2mV 5mV 0 0.5mV 1mV 5mV –5 10mV 13 VS = ±15V TA = 25°C 1 0 2 –15 3 VS = ±15V 50 0 TEMPERATURE (°C) –50 120 VS = ±15V TA = 25°C 100 CMRR (dB) PSRR CMRR 60 40 20 125 LT1055/56 G22 0 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M LT1055/56 G23 100 LT1055/56 G21 Common Mode Rejection Ratio vs Frequency 80 25 75 TEMPERATURE (°C) –12 LT1055/56 G20 VS = ±10V TO ±17V FOR PSRR VS = ±15V, VCM = ±10.5V FOR CMRR –25 –11 SETTLING TIME (µS) 110 90 11 ±10 –14 Common Mode and Power Supply Rejections vs Temperature 100 12 –13 0.5mV 2mV 1mV LT1055/56 G19 CMRR, PSRR (dB) LT1055/56 G18 14 –10 3 125 –25 25 75 TEMPERATURE (°C) 15 SETTLING TIME (µS) 120 30 10 –75 8 10 10 OUTPUT VOLTAGE SWING FROM 0V (V) OUTPUT VOLTAGE SWING FROM 0V (V) 5 100 LT1056 Settling Time 2mV 10mV RL = 1k LT1055/56 G17 LT1055 Settling Time 10 300 160 VS = ±15V TA = 25°C 0 –20 140 BATTERY VOLTAGE (V) GAIN (dB) LT1056 LT1055 10 PHASE SHIFT (DEGREES) 60 120 LT1056 LT1055 VS = ±15V VO = ±10V RL = 2k PHASE 100 80 1000 Power Supply Rejection Ratio vs Frequency 140 POWER SUPPLY REJECTION RATIO (dB) 120 Voltage Gain vs Temperature 100 VOLTAGE GAIN (V/mV) Gain vs Frequency 140 TA = 25°C 120 100 POSITIVE SUPPLY 80 NEGATIVE SUPPLY 60 40 20 0 10 100 100k 10k 1k FREQUENCY (Hz) 1M 10M LT1055/56 G24 10556fd 8 For more information www.linear.com/LT1055 LT1055/LT1056 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage Output Swing vs Load Resistance 8 TA = –55°C LT1056 25°C 4 TA = 125°C TA = –55°C LT1055 25°C 2 TA = 125°C 9 3 5 10 15 SUPPLY VOLTAGE (V) 20 TA = –125°C VS = ±15V 0 –3 TA = –25°C –6 –9 TA = –55°C –15 0.1 TA = –55°C 40 TA = –25°C 6 –12 0 TA = –55°C SHORT-CIRCUIT CURRENT (mA) 6 OUTPUT VOLTAGE SWING (V) SUPPLY CURRENT (mA) 12 0 Short-Circuit Current vs Time 50 15 TA = –125°C TA = 125°C 20 10 0 VS = ±15V –10 SINKING –20 TA = 125°C –30 TA = 25°C –40 0.3 1 3 LOAD RESISTANCE (kΩ) –50 10 LT1055/56 G26 LT1055/56 G25 TA = 25°C 30 TA = –55°C 0 2 1 3 TIME FROM OUTPUT SHORT TO GROUND (MINUTES) LT1055/56 G27 APPLICATIONS INFORMATION The LT1055/LT1056 may be inserted directly into LF155A/ LT355A, LF156A/LT356A, OP-15 and OP-16 sockets. Offset nulling will be compatible with these devices with the wiper of the potentiometer tied to the positive supply. Offset Nulling V+ Board leakage can be minimized by encircling the input circuitry with a guard ring operated at a potential close to that of the inputs: in inverting configurations the guard ring should be tied to ground, in noninverting connnections to the inverting input at pin 2. Guarding both sides of the + 6 OUT 4 V– LT1055/56 AI1 No appreciable change in offset voltage drift with temperature will occur when the device is nulled with a potentiometer, RP, ranging from 10k to 200k. The LT1055/LT1056 can also be used in LF351, LF411, AD547, AD611, OPA-111, and TL081 sockets, provided that the nulling cicuitry is removed. Because of the LT1055/ LT1056’s low offset voltage, nulling will not be necessary in most applications. N/C OFFSET TRIM V+ 7 OUTPUT 8 1 6 Achieving Picoampere/Microvolt Performance In order to realize the picoampere-microvolt level accuracy of the LT1055/LT1056 proper care must be exercised. For 2 5 OFFSET TRIM 4 3 TS LT1055 LT1056 7 PU 3 5 – V– IN 1 RP 2 example, leakage currents in circuitry external to the op amp can significantly degrade performance. High quality insulation should be used (e.g. Teflon, Kel-F); cleaning of all insulating surfaces to remove fluxes and other residues will probably be required. Surface coating may be necessary to provide a moisture barrier in high humidity environments. GUARD LT1055/56 AI2 10556fd For more information www.linear.com/LT1055 9 LT1055/LT1056 APPLICATIONS INFORMATION printed circuit board is required. Bulk leakage reduction depends on the guard ring width. The LT1055/LT1056 has the lowest offset voltage of any JFET input op amp available today. However, the offset voltage and its drift with time and temperature are still not as good as on the best bipolar amplifiers because the transconductance of FETs is considerably lower than that of bipolar transistors. Conversely, this lower transconductance is the main cause of the significantly faster speed performance of FET input op amps. Offset voltage also changes somewhat with temperature cycling. The AM grades show a typical 20µV hysteresis (30µV on the M grades) when cycled over the –55°C to 125°C temperature range. Temperature cycling from 0°C to 70°C has a negligible (less than 10µV) hysteresis effect. The offset voltage and drift performance are also affected by packaging. In the plastic N8 package the molding compound is in direct contact with the chip, exerting pressure on the surface. While NPN input transistors are largely unaffected by this pressure, JFET device matching and drift are degraded. Consequently, for best DC performance, as shown in the typical performance distribution plots, the TO-5 H package is recommended. Noise Performance ing an LT1056 at ±5V supplies or with a 20°C/W caseto-ambient heat sink reduces 0.1Hz to 10Hz noise from typically 2.5µVP-P (±15V, free-air) to 1.5µVP-P. Similiarly, the noise of an LT1055 will be 1.8µVP-P typically because of its lower power dissipation and chip temperature. High Speed Operation Settling time is measured in the test circuit shown. This test configuration has two features which eliminate problems common to settling time measurments: (1) probe capacitance is isolated from the “false summing” node, and (2) it does not require a “flat top” input pulse since the input pulse is merely used to steer current through the diode bridges. For more details, please see Application Note 10. As with most high speed amplifiers, care should be taken with supply decoupling, lead dress and component placement. When the feedback around the op amp is resistive (RF), a pole will be created with RF, the source resistance and capacitance (RS, CS), and the amplifier input capacitance (CIN ≈ 4pF). In low closed-loop gain configurations and with RS and RF in the kilohm range, this pole can create excess phase shift and even oscillation. A small capacitor (CF) in parallel with RF eliminates this problem. With RS (CS + CIN) = RFCF, the effect of the feedback pole is completely removed. The current noise of the LT1055/LT1056 is practically immeasurable at 1.8fA/√Hz. At 25°C it is negligible up to 1G of source resistance, RS (compound to the noise of RS). Even at 125°C it is negligible to 100M of RS. The voltage noise spectrum is characterized by a low 1/f corner in the 20Hz to 30Hz range, significantly lower than on other competitive JFET input op amps. Of particular interest is the fact that with any JFET IC amplifier, the frequency location of the 1/f corner is proportional to the square root of the internal gate leakage currents and, therefore, noise doubles every 20°C. Furthermore, as illustrated in the noise versus chip temperature curves, the 0.1Hz to 10Hz peak-to-peak noise is a strong function of temperature, while wideband noise (fO = 1kHz) is practically unaffected by temperature. Consequently, for optimum low frequency noise, chip temperature should be minimized. For example, operat- CF RF – RS CS CIN OUTPUT + LT1055/56 AI03 Phase Reversal Protection Most industry standard JFET input op amps (e.g., LF155/ LF156, LF351, LF411, OP15/16) exhibit phase reversal at the output when the negative common mode limit at the input is exceeded (i.e., from –12V to –15V with ±15V supplies). This can cause lock-up in servo systems. As shown below, the LT1055/LT1056 does not have this problem due to unique phase reversal protection circuitry (Q1 on simplified schematic). 10556fd 10 For more information www.linear.com/LT1055 LT1055/LT1056 APPLICATIONS INFORMATION Settling Time Test Circuit 15V + 0.01 DISC 10pF (TYPICAL) 15k 10µF SOLID TANTALUM 10k – –15V 0.01 DISC 50Ω 2W 15V + 10µF SOLID TANTALUM 2k + PULSE GEN INPUT (5V MIN STEP) + 2k LT1055 LT1056 15k + 10µF SOLID TANTALUM AUT OUTPUT AMPLIFIER UNDER TEST 10k 15k 2N3866 15V 2N160 1/2 U440 HP5082-8210 HEWLETT PACKARD 0.01 DISC 3Ω –15V 50Ω 3Ω 2N3866 100Ω DC ZERO 15k + 0.01 DISC OUTPUT TO SCOPE 15V 1/2 U440 –15V 15V 4.7k 10µF SOLID TANTALUM = 1N4148 –15V 2N5160 4.7k –15V LT1055/56 AI04 Voltage Follower with Input Exceeding the Negative Common Mode Range 15V 2 INPUT ±15V SINE WAVE 3 – 7 LT1055/56 + 4 6 OUTPUT 2k –15V LT1055/56 AI05 10V/DIV 10V/DIV 0.5ms/DIV 0.5ms/DIV 0.5ms/DIV LT1055/56 AI06 Output LT1055/LT1056 10V/DIV Output (LF155/LF56, LF441, OP-15/OP-16) Input LT1055/56 AI07 LT1055/56 AI08 10556fd For more information www.linear.com/LT1055 11 LT1055/LT1056 TYPICAL APPLICATIONS † Exponential Voltage-to-Frequency Converter for Music Synthesizers INPUT 0V TO 10V EXPONENT TRIM 2500Ω* 11.3k* 5 6 3.57k* ZERO TRIM 500pF POLYSTYRENE 15V 500k 2N3904 7 – 500Ω* 6 LT1055 3 + SAWTOOTH OUTPUT –15V 1.1k 4.7k 15V 2 4 2N3906 1k* 562Ω* LM329 4.7k 10k* 10k* 2 1k* – 2 + 3 SCALE FACTOR 1V IN OCTAVE OUT *1% METAL FILM RESISTOR PIN NUMBERED TRANSISTORS = CA3096 ARRAY 15V 3k 6 LM301A 3 1 15V 7 8 13 8 1 4 0.01µF 7 14 1N148 9 33Ω 15 2.2k –15V †For TEMPERATURE CONTROL LOOP LT1055/56 TA03 ten additional applications utilizing the LT1055 and LT1056, please see the LTC1043 data sheet and Application Note 3. 12-Bit Charge Balance A/D Converter 74C00 28k 0.003µF 14k 0.01µF 2 3 249k* CLK OUTPUT (B) 15V 7 – 10k 6 LT1055 + 10k 33k 6 33k 10k – + 15V 2 LT1001 4 OUTPUT (A) 15V LM329 15V 7 CLK Q 74C74 Q P CL 2N3904 1N4148 COUPLE THERMALLY 1N4148 D 4 –15V 1N4148 0V TO 10V INPUT 1N4148 3 CIRCUIT OUTPUT fOUT (A) RATIO fCLK (B) –15V LT1055/56 TA04 10556fd 12 For more information www.linear.com/LT1055 LT1055/LT1056 TYPICAL APPLICATIONS Fast “No Trims” 12-Bit Multiplying CMOS DAC Amplifier Fast, 16-Bit Current Comparator RFEEDBACK REFERENCE IN * = 1% FILM RESISTOR 15V – OUTPUT LT1055 IOUT2 DELAY = 250ns HP5082-2810 IOUT1 TYPICAL 12-BIT CMOS DAC 4.7k 15V + 50k* – 100k* INPUT 7 6 LT1056 3 LT1009 2.5V LT1055/56 TA05 2 15V + 4 2 3 –15V + 3k 8 7 LT1011 – OUTPUT 1 4 –15V LT1055/56 TA06 Temperature-to-Frequency Converter 15V 560Ω 1k* 1k* 15V 2N2222 10k 2N2907 6.2k* LM329 2k 100°C ADJ 500Ω 0°C ADJ 6.2k* 0.01µF POLYSTYRENE 510pF 15V 2 3 – + 820Ω* 2N2222 4.7k 10k 7 LT1055 2.7k TTL OUTPUT 0kHz TO 1kHz = 0°C TO 100°C 6 4 –15V LM134 510Ω 2V 137Ω* *1% FILM RESISTOR LT1055/56 TA07 10556fd For more information www.linear.com/LT1055 13 LT1055/LT1056 TYPICAL APPLICATIONS 100kHz Voltage Controlled Oscillator 15V 2 *1% FILM RESISTOR =1N4148 100kHz DISTORTION TRIM 2k 9.09k* 22.1k 10k* 2 – 7 LT1056 3 + 6 2N4391 2N4391 5k* 4 –15V 4 –15V 2.5k* 68k FINE DISTORTION TRIMS POLYSTYRENE 500pF 22M 15V 0V TO 10V INPUT + 4.5k 1k 15V 50k 10Hz DISTORTION TRIM –15V 2 3 2N4391 + 4 –15V VR Y1 Y2 GT UP –V –15V 22k 2 HP50822810 3 + –15 10k 1k 8 1k 7 LT1011 – +15V SINE OUT 2VRMS 0kHs TO 100kHs 5k FREQUENCY TRIM 68k 15pF +V CC W Z1 Z2 10k* 6 LT1056 10k X1 X2 U1 U2 AD639 COM 15V 15V 7 – 6 LT1056 3 FREQUENCY LINEARITY = 0.1% FREQUENCY STABILITY = 150ppm/°C SETTLING TIME = 1.7µs DISTORTION = 0.25% AT 100kHz, 0.07% AT 10zHz 7 – 1 4 20pF 0.01µF –15V 10k LM329 4.7k –15V 4.7k 15V LT1055/56 TA08 12-Bit Voltage Output D/A Converter 12-BIT CURRENT OUTPUT D/A CONVERTER (e.g., 6012,565 OR DAC-80) CF 2 0 TO 2 OR 4mA CF = 15pF TO 33pF SETTLING TIME TO 2mV (0.8 LSB) = 1.5µs TO 2µs 3 – 15V 7 6 LT1056 + 4 OUTPUT 0V TO 10V –15V LT1055/56 TA09 10556fd 14 For more information www.linear.com/LT1055 LT1055/LT1056 SIMPLIFIED SCHEMATIC NULL 5 7 V+ 7k 7k Q8 Q7 NULL 1 J5 J6 –INPUT 2 +INPUT 3 300Ω J1 7.5pF J7 Q9 J2 Q15 Q12 20Ω Q10 Q11 6 OUTPUT J3 J8 Q1 14k Q13 Q14 Q5 8k 200Ω 14k Q2 9pF Q3 120µA* (160) J4 120µA* (160) Q4 800µA* (1000) 400µA* (1100) Q16 3k 50Ω 4 V– *CURRENTS AS SHOWN FOR LT1055. (X) = CURRENTS FOR LT1056. LT1055/56 SCHM 10556fd For more information www.linear.com/LT1055 15 LT1055/LT1056 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. H Package 8-Lead TO-5 Metal Can (.200 Inch PCD) (Reference LTC DWG # 05-08-1320) .040 (1.016) MAX .335 – .370 (8.509 – 9.398) DIA .305 – .335 (7.747 – 8.509) .050 (1.270) MAX SEATING PLANE .165 – .185 (4.191 – 4.699) GAUGE PLANE .010 – .045* (0.254 – 1.143) REFERENCE PLANE .500 – .750 (12.700 – 19.050) .016 – .021** (0.406 – 0.533) .027 – .045 (0.686 – 1.143) 45° PIN 1 .028 – .034 (0.711 – 0.864) .200 (5.080) TYP .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 0204 OBSOLETE PACKAGE 10556fd 16 For more information www.linear.com/LT1055 LT1055/LT1056 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ±.015* (6.477 ±0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 ) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .100 (2.54) BSC .130 ±.005 (3.302 ±0.127) .120 (3.048) .020 MIN (0.508) MIN .018 ±.003 (0.457 ±0.076) N8 REV I 0711 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) 10556fd For more information www.linear.com/LT1055 17 LT1055/LT1056 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 8 .245 MIN .160 ±.005 .010 – .020 × 45° (0.254 – 0.508) NOTE: 1. DIMENSIONS IN 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .053 – .069 (1.346 – 1.752) 0°– 8° TYP .016 – .050 (0.406 – 1.270) 6 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP .008 – .010 (0.203 – 0.254) 7 .014 – .019 (0.355 – 0.483) TYP 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) 4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE 2 3 4 .004 – .010 (0.101 – 0.254) .050 (1.270) BSC SO8 REV G 0212 10556fd 18 For more information www.linear.com/LT1055 LT1055/LT1056 REVISION HISTORY (Revision history begins at Rev D) REV DATE DESCRIPTION D 08/15 Corrected application circuit. PAGE NUMBER 20 10556fd 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. For more information www.linear.com/LT1055 19 LT1055/LT1056 TYPICAL APPLICATION ±120V Output Precision Op Amp 125V ±25mA OUTPUT HEAT SINK OUTPUT TRANSISTORS 1µF 10k 330Ω 510Ω 2N5415 1N965 100pF 10k 2N3440 50k 2 INPUT 10k 3 – + 1M 2N2222 1k 27Ω 1N4148 7 6 LT1055 OUTPUT 4 1N4148 50k 2N2907 1M 1k 27Ω 2N5415 2N3440 1N965 10k 33pF 100k 510Ω 1µF 330Ω –125V LT1055/56 TA10 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1122 Fast Settling JFET Op Amp 340ns Settling Time, GBW = 14MHz, SR = 60V/µs LT1792 Low Noise JFET Op Amp en = 6nV/√Hz Max at f = 1kHz 10556fd 20 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LT1055 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT1055 LT 0815 REV D • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 1994