LT1457CN8

LT1457 Dual, Precision JFET Input Op Amp FEATURES s s s s s s s s DESCRIPTION The LT1457 is a dual, JFET input op amp optimized for handling large capacitive loads in combination with precision performance. Precision specifications include 220µV offset voltage in plastic and surface mount packages. At 70°C input bias current is 50pA, input offset current is 20pA. Channel separation is 130dB. Other dual JFET input op amps from Linear Technology include the LT1057, which is three times faster than the LT1457 but at the expense of significantly lower capacitive load handling capability; and the LT1113 with 4.5nV/√Hz voltage noise. Handles 10,000pF Capacitive Load 450µV Max Offset Voltage 1200µV Max Offset Voltage in S8 Package 50pA Bias Current at 70°C 13nV/√Hz Voltage Noise 4V/µs Slew Rate 4µV/°C Drift 130dB Channel Separation APPLICATIONS s s s s Sample-and-Hold (Drives Large Hold Capacitors) A/D and D/A Converters Photodiode Amplifiers Voltage-to-Frequency Converters TYPICAL PERFORMANCE CHARACTERISTICS Capacitive Load Handling 100 VS = ±15V TA = 25°C AV = +1 PERCENT OF UNITS 21 18 15 12 9 6 3 0 0.1 0 –1.0 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 1.0 INPUT OFFSET VOLTAGE (mV) LT1457 • TA02 Input Offset Voltage Distribution S8 Package VS = ±15V TA = 25°C 400 DUALS (800 OP AMPS) TESTED FROM 3 RUNS 80 OVERSHOOT (%) 60 40 20 1 10 CAPACITIVE LOAD (nF) 100 LT11457• TA01 U UW U 1 LT1457 ABSOLUTE MAXIMUM RATINGS Supply Voltage ...................................................... ± 20V Differential Input Voltage ....................................... ± 40V Input Voltage .......................... Equal to Supply Voltages Output Short-Circuit Duration .......................... Indefinite Operating Temperature Range ................ – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C PACKAGE/ORDER INFORMATION TOP VIEW OUT A –IN A +IN A V– 1 2 A 3 4 B 6 5 –IN B +IN B 8 7 V + ORDER PART NUMBER LT1457ACN8 LT1457CN8 OUT B N8 PACKAGE 8-LEAD PLASTIC DIP TJMAX = 115°C, θJA = 130°C/ W TOP VIEW +IN A V– +IN B –IN B 1 2 3 4 B S8 PACKAGE 8-LEAD PLASTIC SOIC NOTE: THIS PIN CONFIGURATION DIFFERS FROM THE 8-LEAD DIP PIN LOCATIONS. INSTEAD, IT FOLLOWS THE INDUSTRY STANDARD LT1013DS8 SO PACKAGE CONFIGURATION. A 8 7 6 5 –IN A OUT A V+ OUT B LT1457S8 S8 PART MARKING 1457 TJMAX = 130°C, θJA = 190°C/ W Consult factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER VOS Input Offset Voltage IOS IB Input Offset Current Input Bias Current Input Resistance-Differential -Common-Mode Input Capacitance en en in AVOL Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Large-Signal Voltage Gain Input Voltage Range CMRR PSRR VOUT SR Common-Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing Slew Rate VCM = ± 10.5V 0.1Hz to 10Hz CONDITIONS LT1457AC/C LT1457S8 VS = ±15V, TA = 25°C,VCM = 0V unless otherwise noted. (Note 1) MIN LT1457AC TYP MAX 150 450 3 ±5 1012 1012 1011 4 2.0 26 13 1.5 150 120 ±10.5 86 88 ±12 2 350 250 14.3 –11.5 100 103 ±13 4 22 4 100 80 ±10.5 82 86 ±12 2 40 ± 50 LT1457C/LT1457S8 MIN TYP MAX 200 800 220 1200 4 ±7 1012 1012 1011 4 2.1 28 14 1.8 300 220 14.3 –11.5 98 102 ±13 4 24 6 50 ±75 UNITS µV µV pA pA Ω Ω Ω pF µVP–P nV/√Hz nV/√Hz fA/√Hz V/mV V/mV V V dB dB V V/µs Fully Warmed Up Fully Warmed Up VCM = –11V to 8V VCM = 8V to 11V fO = 10Hz fO = 1kHz (Note 2) fO = 10Hz, 1kHz (Note 3) VO = ±10V, RL = 2k VO = ±10V, RL = 1k VS = ± 4.5V to ±18V RL = 2k 2 U W U U WW W LT1457 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER GBW IS Gain-Bandwidth Product Supply Current Per Amplifier Channel Separation CONDITIONS (Note 5) VS = ±15V, TA = 25°C,VCM = 0V unless otherwise noted. (Note 1) MIN 1.0 LT1457AC TYP MAX 1.7 1.8 3.0 132 LT1457C/LT1457S8 MIN TYP MAX 1.0 1.7 1.8 130 3.0 UNITS MHz mA dB DC to 5kHz, VIN = ±10V ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Input Offset Voltage VOS Average Temperature Coefficient of Input Offset Voltage (Note 4) Input Offset Current Input Bias Current Large-Signal Voltage Gain Common-Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing Supply Current Per Amplifier CONDITIONS LT1457AC/C LT1457S8 VS = ±15V, VCM = 0V, 0°C ≤ TA ≤ 70°C, unless otherwise noted. MIN q q q LT1457AC TYP MAX 250 900 3 18 ± 50 220 98 102 ±12.8 1.7 10 150 ± 250 LT1457C/LT1457S8 MIN TYP MAX 330 1500 400 1900 4 16 20 ±60 200 96 100 ±12.8 1.7 250 ±350 UNITS µV µV µV/°C pA pA V/mV dB dB V mA mA IOS IB AVOL CMRR PSRR VOUT IS Warmed Up, TA = 70°C Warmed Up, TA = 70°C VO = ±10V, RL = 2k VCM = ±10.4V VS = ± 4.5V to ±18V RL = 2k TA = 70°C q q q q q 70 85 87 ±12 50 80 84 ±12 3.2 3.2 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Input Offset Voltage VOS Average Temperature Coefficient of Input Offset Voltage Input Offset Current Input Bias Current Large-Signal Voltage Gain Common-Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing Supply Current Per Amplifier CONDITIONS LT1457AC/C LT1457S8 VS = ±15V, VCM = 0V, –40°C ≤ TA ≤ 85°C, unless otherwise noted. (Note 6) MIN q q q LT1457AC TYP MAX 350 1100 3 0.1 ± 0.2 120 97 100 ±12.7 1.7 10 0.5 ± 0.7 LT1457C/LT1457S8 MIN TYP MAX 400 1800 500 2300 4 16 0.1 ± 0.2 110 95 98 ±12.6 1.7 0.6 ± 0.9 UNITS µV µV µV/°C nA nA V/mV dB dB V mA mA IOS IB AVOL CMRR PSRR VOUT IS Warmed Up, TA = 85°C Warmed Up, TA = 85°C VO = ±10V, RL = 2k VCM = ±10.4V VS = ±5V to ±17V RL = 2k TA = – 40°C TA = 85°C q q q q 40 84 86 ±12 30 80 83 ±12 3.8 3.8 The q denotes the specifications which apply over the full operating temperature range. Note 1: Typical parameters are defined as the 60% yield of distributions of individual amplifiers; i.e., out of 100 LT1457s (200 op amps) typically 120 will be better than the indicated specification. Note 2: This parameter is tested on a sample basis only. Note 3: Current noise is calculated from the formula: in = (2qIb)1/2, where q = 1.6 x 10 –19 coulomb. The noise of source resistors up to 1GΩ swamps the contribution of current noise. Note 4: This parameter is not 100% tested. Note 5: Gain-Bandwidth product is not tested. It is guaranteed by design and by inference from the slew rate measurement. Note 6: The LT1457 is not tested and not quality-assurance-sampled at – 40°C and at 85°C. These specifications are guaranteed by design, correlation, and/or inference from 0°C, 25°C, and 70°C tests. 3 LT1457 TYPICAL PERFORMANCE CHARACTERISTICS Input Bias and Offset Current vs Temperature 1000 160 INPUT BIAS AND OFFSET CURRENT (pA) INPUT BIAS CURRENT (pA) 300 CHANGE IN OFFSET VOLTAGE (µV) VS = ±15V VCM = 0V WARMED UP 100 BIAS CURRENT 30 10 OFFSET CURRENT 3 0 25 50 75 AMBIENT TEMPERATURE (°C) 100 Input Offset Voltage Distribution N8 Package 24 21 VS = ±15V TA = 25°C 1000 OFFSET VOLTAGE CHANGE (µV) VOLTAGE GAIN (V/mV) PERCENT OF UNITS 18 15 12 9 6 3 900 DUALS (1800 OP AMPS) TESTED FROM 3 RUNS 0 0.2 0.4 0.6 0.8 –0.8 –0.6 –0.4 –0.2 0 INPUT OFFSET VOLTAGE (mV) LT1457 • TPC04 Voltage Noise vs Frequency 100 RMS VOLTAGE NOISE DENSITY (nV/√Hz) 70 50 VS = ±15V TA = 25°C CHANNEL SEPARATION (dB) NOISE VOLTAGE (1µV/DIV) 30 20 1/f CORNER = 28Hz 10 3 10 30 100 300 1k FREQUENCY (Hz) 3k 10k 0 2 4 6 TIME (SECONDS) 8 10 4 UW LT1457 • TPC01 LT1457 • TPC07 Input Bias Current Over the Common-Mode Range 150 VS = ±15V 120 140 120 100 80 60 40 20 0 –20 –15 TA = 25°C –10 –5 0 5 10 COMMON-MODE INPUT VOLTAGE (V) 15 TA = 70°C Warm-Up Drift VS = ±15V TA = 25°C 90 S8 PACKAGE 60 N8 PACKAGE 30 0 0 1 2 3 4 TIME AFTER POWER ON (MINUTES) 5 LT1457 • TPC02 LT1457 • TPC03 Voltage Gain vs Temperature 50 RL = 2k 300 RL = 1k 100 VS = ±15V VO = ±10V 40 30 20 10 0 –10 –20 –30 –40 10 –50 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 Long Term Drift of Representative Units VS = ±15V TA = 25°C 30 0 1 2 3 TIME (MONTHS) 4 5 LT1457 • TPC05 LT1457 • TPC06 0.1Hz to 10Hz Noise 160 VS = ±15V TA = 25°C Channel Separation vs Frequency 140 LIMITED BY THERMAL INTERACTION AT DC = 132dB LIMITED BY PIN TO PIN CAPACITANCE VS = ±15V TA = 25°C VIN = 20VP-P TO 5kHz RL = 2k 1 10 RS = 10Ω 120 100 80 RS = 1k 100k 1M 60 100 1k 10k FREQUENCY (Hz) LT1457 • TPC08 LT1457 • TPC09 LT1457 TYPICAL PERFORMANCE CHARACTERISTICS Common-Mode Rejection Ratio vs Frequency 120 100 80 VS = ±15V TA = 25°C COMMON -MODE RANGE (V) 15 14 13 CMRR, PSRR (dB) 12 11 ±10 –11 –12 –13 –14 0 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M –15 – 50 VS = ±15V –25 0 25 50 TEMPERATURE (°C) 75 100 90 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 110 PSRR CMRR (dB) 60 40 20 Slew Rate, Gain-Bandwidth Product vs Temperature 10 VS = ±15V 8 SUPPLY CURRENT PER AMPLIFIER (mA) 2.5 3 SHORT-CIRCUIT CURRENT (mA) SLEW RATE (V/µs) SLEW FALL 6 GBW 4 SLEW RISE 2 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 1.0 Gain, Phase vs Frequency 25 20 15 PEAK TO PEAK OUTPUT SWING (V) PHASE MARGIN = 80°, CL = 10pF PHASE MARGIN = 51°, CL = 1000pF CL = 10pF PHASE CL = 1000pF GAIN VOLTAGE GAIN (dB) PSRR (dB) 10 5 0 –5 –10 –15 0.1 VS = ±15V TA = 25°C CL = 1000pF CL = 10pF 10 LT1457 • TPC16 1.0 FREQUENCY (MHz) UW LT1457• TPC10 LT1457 • TPC18 Common-Mode Range vs Temperature 120 Common-Mode and Power Supply Rejections vs Temperature VS = ± 5V TO ±17V FOR PSRR VS = ±15V, VCM = ±10.5V FOR CMRR CMRR 100 LT1457 • TPC11 LT1457 • TPC12 Supply Current vs Temperature 50 40 30 20 10 0 –10 –20 –30 – 40 0 –50 – 50 –25 0 25 50 TEMPERATURE (°C) 75 100 Short-Circuit Current vs Time (One Output Shorted to Ground) TA = – 40°C 2.0 2 VS = ±15V VS = ± 5V GBW (MHz) PHASE MARGIN (DEG) TA = 25°C TA = 25°C TA = 85°C TA = 85°C 1.5 1 TA = – 40°C VS = ±15V 0 1 2 3 TIME FROM OUTPUT SHORT TO GROUND (MINUTES) LT1457 • TPC15 LT1457 • TPC14 Undistorted Output Swing vs Frequency 30 100 80 60 40 20 0 –20 VS = ±15V TA = 25°C 24 100 18 80 60 40 6 20 0 10k 0 100k 1M FREQUENCY (Hz) 10M LT11457• TPC17 Power Supply Rejection Ratio vs Frequency 140 TA = 25°C 120 POSITIVE SUPPLY NEGATIVE SUPPLY 12 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M LT1457• TPC13 5 LT1457 TYPICAL PERFORMANCE CHARACTERISTICS Large-Signal Response AV = 1, CL = 100pF Small-Signal Response AV = 1, CL = 1000pF Small-Signal Response AV = 1, CL = 10,000pF APPLICATIONS INFORMATION Phase Reversal Protection Most industry standard JFET input single, dual, and quad op amps (e.g., LF156, LF351, LF353, LF411, LF412, OP-15, OP-16, OP-215, and TL084) exhibit phase reversal at the output when the negative common-mode limit at the input is exceeded (i.e., below –12V with ±15V supplies). The photos show a ±16V sine wave input (A), the response of an LF412A in the unity gain follower mode (B), and the response of the LT1457 (C). The phase reversal of photo (B) can cause lock-up in servo systems. The LT1457 does not phase-reverse due to a unique phase reversal protection circuit. LT1457 AI01 (A) ±16V Sine Wave Input All Photos 5V/Div Vertical Scale, 50µs/Div Horizontal Scale 6 U W UW LT1457 TPC19 LT1457 TPC20 LT1457 TPC21 U U LT1457 AI02 LT1457 AI03 (B) LF412A Output (C) LT1457 Output LT1457 APPLICATIONS INFORMATION High Speed Operation When the feedback around the op amp is resisitive (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 on high speed amplifiers. Because the LT1457’s phase margin is very high, this problem is minimal. However, 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. CF PACKAGE DESCRIPTION Dimension in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP 0.300 – 0.320 (7.620 – 8.128) 0.045 – 0.065 (1.143 – 1.651) 0.009 – 0.015 (0.229 – 0.381) 0.065 (1.651) TYP 0.125 (3.175) MIN 0.020 (0.508) MIN 1 2 3 ( +0.025 0.325 –0.015 8.255 +0.635 –0.381 ) 0.045 ± 0.015 (1.143 ± 0.381) 0.100 ± 0.010 (2.540 ± 0.254) 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.228 – 0.244 (5.791 – 6.197) 0°– 8° TYP 0.014 – 0.019 (0.355 – 0.483) 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 U W U U RF – RS CS CIN OUTPUT + LT1457 AI04 0.130 ± 0.005 (3.302 ± 0.127) 0.400 (10.160) MAX 8 7 6 5 0.250 ± 0.010 (6.350 ± 0.254) 0.018 ± 0.003 (0.457 ± 0.076) 4 N8 0392 S8 Package 8-Lead Plastic SOIC 8 0.189 – 0.197 (4.801 – 5.004) 7 6 5 0.050 (1.270) BSC 0.150 – 0.157 (3.810 – 3.988) 1 2 3 4 SO8 0392 7 LT1457 U.S. Area Sales Offices NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 CENTRAL REGION Linear Technology Corporation Chesapeake Square 229 Mitchell Court, Suite A-25 Addison, IL 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite 206 Woodland Hills, CA 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 NORTHWEST REGION Linear Technology Corporation 782 Sycamore Dr. Milpitas, CA 95035 Phone: (408) 428-2050 FAX: (408) 432-6331 International Sales Offices FRANCE Linear Technology S.A.R.L. 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The Coliseum, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Phone: 44-276-677676 FAX: 44-276-64851 World Headquarters Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7487 Phone: (408) 432-1900 FAX: (408) 434-0507 0294 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 LT/GP 0594 10K • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1994