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LT1457 Dual, Precision JFET Input Op Amp
FEATURES
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DESCRIPTION
The LT1457 is a dual, JFET input op amp optimized for handling large capacitive loads in combination with precision performance. Precision specifications include 220V offset voltage in plastic and surface mount packages. At 70C 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 450V Max Offset Voltage 1200V Max Offset Voltage in S8 Package 50pA Bias Current at 70C 13nV/Hz Voltage Noise 4V/s Slew Rate 4V/C Drift 130dB Channel Separation
APPLICATIONS
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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 = 25C 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 = 25C 400 DUALS (800 OP AMPS) TESTED FROM 3 RUNS
80 OVERSHOOT (%)
60
40
20
1 10 CAPACITIVE LOAD (nF)
100
LT11457* TA01
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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 ................ - 40C to 85C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
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 = 115C, JA = 130C/ 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 = 130C, JA = 190C/ 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 = 25C,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 V V pA pA pF VP-P nV/Hz nV/Hz fA/Hz V/mV V/mV V V dB dB V V/s
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
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LT1457
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER GBW IS Gain-Bandwidth Product Supply Current Per Amplifier Channel Separation CONDITIONS (Note 5)
VS = 15V, TA = 25C,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, 0C TA 70C, 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 V V V/C pA pA V/mV dB dB V mA mA
IOS IB AVOL CMRR PSRR VOUT IS
Warmed Up, TA = 70C Warmed Up, TA = 70C VO = 10V, RL = 2k VCM = 10.4V VS = 4.5V to 18V RL = 2k TA = 70C
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, -40C TA 85C, 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 V V V/C nA nA V/mV dB dB V mA mA
IOS IB AVOL CMRR PSRR VOUT IS
Warmed Up, TA = 85C Warmed Up, TA = 85C VO = 10V, RL = 2k VCM = 10.4V VS = 5V to 17V RL = 2k TA = - 40C TA = 85C
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 1G 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 - 40C and at 85C. These specifications are guaranteed by design, correlation, and/or inference from 0C, 25C, and 70C tests.
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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 (V)
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 = 25C
1000
OFFSET VOLTAGE CHANGE (V)
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 = 25C
CHANNEL SEPARATION (dB)
NOISE VOLTAGE (1V/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
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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 = 25C 0 -10 -5 0 5 10 COMMON-MODE INPUT VOLTAGE (V) 15 TA = 70C
Warm-Up Drift
VS = 15V TA = 25C
90
S8 PACKAGE
60 N8 PACKAGE 30
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 = 25C
30
0
1
2 3 TIME (MONTHS)
4
5
LT1457 * TPC05
LT1457 * TPC06
0.1Hz to 10Hz Noise
160
VS = 15V TA = 25C
Channel Separation vs Frequency
140 LIMITED BY THERMAL INTERACTION AT DC = 132dB LIMITED BY PIN TO PIN CAPACITANCE VS = 15V TA = 25C VIN = 20VP-P TO 5kHz RL = 2k 1 10 RS = 10
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 = 25C 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/s)
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 = 25C
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 = - 40C
2.0
2
VS = 15V VS = 5V
GBW (MHz) PHASE MARGIN (DEG)
TA = 25C TA = 25C
TA = 85C TA = 85C
1.5
1
TA = - 40C 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 = 25C 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 = 25C 120
POSITIVE SUPPLY NEGATIVE SUPPLY
12
10
100
1k 10k 100k FREQUENCY (Hz)
1M
10M
LT1457* TPC13
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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, 50s/Div Horizontal Scale
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LT1457 TPC19
LT1457 TPC20
LT1457 TPC21
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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 x 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.
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RF
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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. Immeuble "Le Quartz" 58 Chemin de la Justice 92290 Chatenay Malabry France Phone: 33-1-41079555 FAX: 33-1-46314613 GERMANY Linear Techonolgy GmbH Untere Hauptstr. 9 D-85386 Eching Germany Phone: 49-89-3197410 FAX: 49-89-3194821 JAPAN Linear Technology KK 5F YZ Bldg. 4-4-12 Iidabashi, Chiyoda-Ku Tokyo, 102 Japan Phone: 81-3-3237-7891 FAX: 81-3-3237-8010 KOREA Linear Technology Korea Branch Namsong Building, #505 Itaewon-Dong 260-199 Yongsan-Ku, Seoul Korea Phone: 82-2-792-1617 FAX: 82-2-792-1619 SINGAPORE Linear Technology Pte. Ltd. 101 Boon Keng Road #02-15 Kallang Ind. Estates Singapore 1233 Phone: 65-293-5322 FAX: 65-292-0398 TAIWAN Linear Technology Corporation Rm. 801, No. 46, Sec. 2 Chung Shan N. Rd. Taipei, Taiwan, R.O.C. Phone: 886-2-521-7575 FAX: 886-2-562-2285 UNITED KINGDOM Linear Technology (UK) Ltd. 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
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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
(c) LINEAR TECHNOLOGY CORPORATION 1994

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