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LT1097 Low Cost, Low Power Precision Op Amp
FEATURES
s s s s s s s s s s s
DESCRIPTION
LT(R)1097 achieves a new standard in combining low price and outstanding precision performance. On all operational amplifier data sheets, the specifications listed on the front page are for highly selected, expensive grades, while the specs for the low cost grades are buried deep in the data sheet. The LT1097 does not have any selected grades, the outstanding specifications shown in the Features section are for its only grade. The design effort of the LT1097 concentrated on optimizing the performance of all precision specs--at only 350A of supply current. Typical values are 10V offset voltage, 40pA bias and offset currents, 0.2V/C and 0.4pA/C drift. Common mode and power supply rejections, voltage gain are typically in excess of 128dB. All parameters that are important for precision, low power op amps have been optimized. Consequently, using the LT1097 error budget calculations in most applications is unnecessary.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Offset Voltage 50V Max Offset Voltage Drift 1V/C Max Bias Current 250pA Max Offset Current 250pA Max Bias and Offset Current Drift 4pA/C Max Supply Current 560A Max 0.1Hz to 10Hz Noise 0.5Vp-p, 2.2pAp-p CMRR 115dB Min Voltage Gain 117dB Min PSRR 114dB Min Guaranteed Operation on Two NiCad Batteries
APPLICATIONS
s s s s s s
Replaces OP-07/OP-77/OP-97/OP-177/AD707/ LT1001 with Improved Price/Performance High Impedance Difference Amplifiers Logarithmic Amplifiers (Wide Dynamic Range) Thermocouple Amplifiers Precision Instrumentation Active Filters (with Small Capacitors)
TYPICAL APPLICATION
Saturated Standard Cell Amplifier
9V 2N3609 3 7 LT1097 2 OUT = 1.1V TO 8.0V AS 1.8k R2 135k
50 6,500 UNITS IN SO PACKAGE 6,680 UNITS IN PLASTIC DIP 13,180 UNITS TESTED
Input Offset Voltage Distribution
+ -
40
PERCENT OF UNITS
8
+
1.018235V SATURATED STANDARD CELL #101 EPPLEY LABS NEWPORT, R. I.
30
4
20
R1 20k
R2 THE TYPICAL 40pA BIAS CURRENT OF THE LT1097 WILL DEGRADE THE STANDARD CELL BY ONLY 1ppm/YEAR. NOISE IS A FRACTION OF A ppm. UNPROTECTED GATE MOSFET ISOLATES STANDARD CELL ON POWER DOWN.
LT1097*TA01
10
0 -50 -40 -30 -20 -10 0 10 20 30 40 50 INPUT OFFSET VOLTAGE (V)
LT1097 * G01
U
U
U
VS = 15V TA = 25C
1
LT1097
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ...................................................... 20V Differential Input Current (Note 1) ...................... 10mA Input Voltage ......................................................... 20V 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 VOS TRIM 1 -IN 2 +IN 3 V- 4 8 7 6 5 VOS TRIM V+ OUT OVER COMP
ORDER PART NUMBER LT1097CN8
N8 PACKAGE 8-LEAD PLASTIC DIP
ELECTRICAL CHARACTERISTICS
SYMBOL VOS VOS TIME IOS IB en PARAMETER Input Offset Voltage Long Term Input Offset Voltage Stability Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density in Input Noise Current Input Noise Current Density Input Resistance Differential Mode Common Mode Input Voltage Range CMRR PSRR AVOL VOUT SR GBW IS Common Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain Output Voltage Swing Slew Rate Gain Bandwidth Product Supply Current Offset Adjustment Range Minimum Supply Voltage VCM = 13.5V 0.1Hz to 10Hz fO = 10Hz fO = 1000Hz 0.1Hz to 10Hz fO = 10Hz fO = 1000Hz (Note 2) CONDITIONS
VS = 15V, VCM = 0V, TA = 25C, unless otherwise noted.
MIN LT1097CN8 TYP MAX 10 0.3 40 40 0.5 16 14 2.2 0.03 0.008 30 13.5 115 114 700 250 13 11.5 0.1 80 1012 14.3 130 130 2500 1000 13.8 13 0.2 700 350 560 1.2 25 13.5 115 114 700 250 13 11.5 0.1 250 250 50 MIN LT1097S8 TYP 10 0.3 60 50 0.5 16 14 2.4 0.035 0.008 70 8*1011 14.3 130 130 2500 1000 13.8 13 0.2 700 350 600 -- 560 350 350 MAX 60 UNITS V V/Mo pA pA Vp-p nV/Hz nV/Hz pAp-p pA/Hz pA/Hz M V dB dB V/mV V/mV V V V/s kHz A V V
VS = 1.2V to 20V VO = 12V, RL = 10k VO = 10V, RL = 2k RL = 10k RL = 2k
RPOT = 10k, Wiper to V+ (Note 3) 1.2
2
U
U
W
WW U
W
TOP VIEW VOS TRIM 1 -IN 2 +IN 3 V- 4 8 7 6 5 VOS TRIM V+ OUT OVER COMP
ORDER PART NUMBER LT1097S8
S8 PACKAGE 8-LEAD PLASTIC SO
600 --
LT1097
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage Average Temperature Coefficient of (Note 4) Input Offset Voltage IOS Input Offset Current Average Temperature Coefficient of (Note 4) Input Offset Current IB Input Bias Current Average Temperature Coefficient of (Note 4) Input Bias Current AVOL CMRR PSRR VOUT IS Large Signal Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Input Voltage Range Output Voltage Swing Supply Current RL = 10k VOUT = 12V, RL 10k VOUT = 10V, RL 2k VCM = 13.5V VS = 1.3V to 20V CONDITIONS
q q q q q q q q q q q q q
VS = 15V, VCM = 0V, 0C TA 70C, unless otherwise noted.
MIN LT1097CN8 TYP MAX 20 0.2 60 0.4 60 0.4 450 180 112 111 13.5 13 2000 800 128 128 14.2 13.7 380 700 100 1 430 4 430 4 450 180 112 111 13.5 13 MIN LT1097S8 TYP 20 0.2 75 0.5 75 0.5 2000 800 128 128 14.2 13.7 380 700 MAX 130 1.4 570 5 570 5 UNITS V V/C pA pA/C pA pA/C V/mV V/mV dB dB V V A
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage Average Temperature Coefficient of Input Offset Voltage IOS Input Offset Current Average Temperature Coefficient of Input Offset Current IB Input Bias Current Average Temperature Coefficient of Input Bias Current AVOL CMRR PSRR VOUT IS Large Signal Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Input Voltage Range Output Voltage Swing Supply Current RL = 10k CONDITIONS
VS = 15V, VCM = 0V, -40C TA 85C, unless otherwise noted. (Note 5)
MIN
q q q q q q
LT1097CN8 TYP MAX 25 0.3 70 0.5 70 0.5 130 1.2 600 5 600 5
MIN
LT1097S8 TYP 30 0.3 85 0.6 85 0.6
MAX 170 1.6 750 6 750 6
UNITS V V/C pA pA/C pA pA/C V/mV V/mV dB dB V V
VOUT = 12V, RL 10k VOUT = 10V, RL 2k VCM = 13.5V VS = 1.5V to 20V
q q q q q q q
300 108 108 13.5 13
1700 700 127 127 14 13.6 400 800
300 108 108 13.5 13
1700 700 127 127 14 13.6 400 800
A
The q denotes specifications which apply over the full operating temperature range. Note 1: Differential input voltages greater than 1V will cause excessive current to flow through the input protection diodes unless limiting resistance is used. Note 2: This parameter is guaranteed by design and is not tested.
Note 3: Power supply rejection ratio is measured at the minimum supply voltage. Note 4: This parameter is not 100% tested. Note 5: The LT1097 is designed, characterized and expected to meet these extended temperature limits, but is not tested at -40C and 85C. Guaranteed I grade parts are available; consult factory.
3
LT1097 TYPICAL PERFORMANCE CHARACTERISTICS
Distribution to Offset Voltage Drift with Temperature
50
PERCENT OF UNITS
Input Bias Current vs Temperature
200
COMMON MODE RANGE OR OUTPUT SWING (V)
INPUT BIAS CURRENT (pA)
100
UNDERCANCELLED UNIT
0
-100
OVERCANCELLED UNIT
-200
-300 -50
-25
0 25 50 TEMPERATURE (C)
Warm-Up Drift
5
CHANGE IN OFFSET VOLTAGE (V)
INPUT BIAS CURRENT (pA)
4
VS = 15V TA = 25C
3
2 PLASTIC-IN-LINE PACKAGE PLASTIC (N) OR SO (S)
1
0 0 1 2 3 4 TIME AFTER POWER ON (MINUTES) 5
4
UW
40
30
VS = 15V 240 UNITS TESTED IN N8 PACKAGES FROM SIX RUNS
20
10
0 -1.5 -1.2 -0.9 -0.6 -0.3 0 0.3 0.6 0.9 1.2 1.5 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (V/C)
LT1097 * G02
Minimum Supply Voltage, Common Mode Range and Voltage Swing at VMIN
V+ V+ -0.2 V+ -0.4 V+ -0.6 V+ -0.8 V- +0.8 V- +0.6 V- +0.4 V- +0.2 V- -40 -10 20 50 TEMPERATURE (C) 80 110
1097 * G04
1.4 1.2 1.0 CM RANGE SWING RL = 10k SWING CM RANGE 0.8
MINIMUM SUPPLY VOLTAGE, VMIN (V)
75
100
1097 * G03
Input Bias Current Over Common Mode Range
120 80 40 RIN CM = 1012 0 -40
-
VS = 15V TA = 25C DEVICE WITH POSITIVE INPUT CURRENT
DEVICE WITH NEGATIVE INPUT CURRENT
-80 -120 -15
VCM
IB
+
-10 -5 0 5 10 COMMON MODE INPUT VOLTAGE
15
1097 * G05
1097 * G06
LT1097 TYPICAL PERFORMANCE CHARACTERISTICS
Output Short Circuit Current vs Time
20 15 10 5 0 -5 VS = 15V TA = 25C
SHORT CIRCUIT CURRENT (mA) SINKING SOURCING
0.1Hz to 10Hz Noise
VS = 1.2V TO 20V TA = 25C
NOISE VOLTAGE (0.4V/DIV)
NOISE VOLTAGE (0.4V/DIV)
0
2
4 6 TIME (SECONDS)
8
10
1097 * G08
0.4V
Noise Spectrum
1000
VOLTAGE NOISE DENSITY (nVHz) CURRENT NOISE DENSITY (fAHz)
-30
CHANGE IN OFFSET VOLTAGE (V)
TA = 25C VS = 1.2V TO 20V
100
CURRENT NOISE
10
1/f CORNER 2.5Hz
1 1 10 100 FREQUENCY (Hz) 1000
1097 * G10
UW
-10 -15 -20 0 1 2 TIME FROM OUTPUT SHORT (MINUTES) 3
1097 * G07
0.01Hz to 10Hz Noise
VS = 1.2V TO 20V TA = 25C
0
20
40 60 TIME (SECONDS)
80
100
1097 * G09
Voltage Gain
Vs = 15 V TA = 25C
-20 -10
RL = 10k 0 10 20 30 -15 RL = 2k RL = 10k RL = 2k
VOLTAGE NOISE
1/f CORNER 140Hz
-10
-5 0 5 OUTPUT VOLTAGE (V)
10
15
1097 * G11
5
LT1097 TYPICAL PERFORMANCE CHARACTERISTICS
Voltage Gain vs Frequency
140 120 100 VS = 15V TA = 25C
VOLTAGE GAIN (dB)
Gain, Phase Shift vs Frequency
40
COMMON MODE REJCTION RATIO (dB)
VS = 15V TA = 25C
30 GAIN
GAIN (dB)
20
10
0 PHASE MARGIN = 70C -10 0.01 0.1 1 FREQUENCY (MHz) 10
1097 * G13
Power Supply Rejection vs Frequency
140
POWER SUPPLY REJECTION RATIO (dB)
1
120 100
SLEW RATE (V/s)
80 POSITIVE SUPPLY 60 40 20 0.1
1
10
100 1k 10k 100k FREQUENCY (Hz)
6
UW
80 60 40 20 0 -20 0.01 0.1
1
10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
1097 * G12
Common Mode Rejection vs Frequency
100
140 120 100 80 60 40 20 0 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M VS = 15V TA = 25C
PHASE
120
PHASE SHIFT (DEGREES)
140
160
180
200
1097 * G14
Slew Rate, Gain Bandwidth Product vs Overcompensation Capacitor
1000
GAIN BANDWIDTH PRODUCT (kHz)
VS = 15V TA = 25C
0.1 SLEW GBW 100
NEGATIVE SUPPLY
0.01 VS = 15V TA = 25C
10
0.001
1M
1
1 10 100 1000 10000 OVERCOMPENSATION CAPACITOR (pF)
1097 * G16
1097 * G15
LT1097 TYPICAL PERFORMANCE CHARACTERISTICS
Small Signal Transient Response Large Signal Transient Response
20mV/DIV
AV = 1, CLOAD = 100pF, 5s/DIV
1097 G17
2V/DIV
OVERSHOOT (%)
UW
AV = 1, 20s/DIV
1097 G18
Capacitive Load Handling
70 60 50 40 30 20 10 0 10 100 1000 CAPACITIVE LOAD (pF) 10,000
1097 G19
TA = 25C VS = 15V CS: PIN 5 TO GROUND AV = 1 CS = 0 AV = 1 CS = 200pF
AV = 10 CS = 0
7
LT1097
SCHEMATIC DIAGRAM
TRIM 1 800 TRIM 8 800 35A 30k 30k 30pF 1.3k Q22 1.5k 2.5k Q21 Q5 Q6 Q8 Q4 Q7 Q13
-
IN
S Q1 Q2
S
2
Q9 Q12 Q16
+
IN
Q10 Q17 3.7k 15A 5A Q14 5A 3.7k V- 4 Q1-Q4 ARE SUPERGAIN TRANSISTORS
1097 BD
3
8
W
5 OVER COMP V+ 7 20A 80A Q19 1.5k Q33 Q25 Q27 Q29 S Q24 40 3k 100 OUT 6 1.5k Q20 50k 1.5k J1 Q18 Q28 Q26 Q32 40 S Q3 Q11 Q23 80A Q15 Q30 Q31 3.7k 16k 40 330
W
LT1097
APPLICATIONS INFORMATION
The LT1097 is pin compatible to and directly replaces such precision op amps as the OP-07, OP-77, AD707, OP-97, OP177, LM607 and LT1001 with improved price/performance. Compatibility includes externally nulling the offset voltage, as all of the above devices are trimmed with a potentiometer between Pin 1 and Pin 8 and the wiper tied to V+. The simple difference amplifier can be used to illustrate the all-around excellence of the LT1097. The 50k input resistance is selected to be large enough compared to input signal source resistance. Simultaneously, the 50k resistors should not dominate the precision and noise error budget. Assuming perfect matching between the four resistors, the following table summarizes the input
27V Common Mode Range Difference Amplifier
50k 15V 50k -IN 50k +IN 2
- +
7 LT1097 6 OUT
3
4 -15V
LT1097*F01
50k
Guaranteed Perfomance, VS = 15V, TA = 25C
PARAMETER Error Terms VOS Max IOS Max*25k Gain Min, 10V Out CMRR, Min, 25V In PSRR, Min, VS = 15V 10% Sum of All Error Terms 0.1Hz to 10Hz Noise Voltage Noise Current Noise*50k Resistor Noise RMS sum Drift with Temp TCVOS Max TCIOS Max*25k Sum of Drift Terms Supply Current Max LT1097CN8 50 6 14 22 6 98 0.5 0.11 0.55 0.75 1 0.1 1.1 0.56 OP-77GP 100 70 5 20 9 204 0.38 0.75 0.55 1 1.2 2.1 3.3 2 AD707JN 90 50 3 13 9 165 0.23 0.7 0.55 0.92 1 1 2 3 OP-177GP 60 70 5 22 9 166 0.38 0.75 0.55 1 1.2 2.1 3.3 2 OP-97FP 75 4 50 39 9 177 0.5 0.1 0.55 0.75 2 0.2 2.2 0.6 UNITS V V V V V V Vp-p Typ Vp-p Typ Vp-p Typ Vp-p V/C V/C V/C mA
U
W
U
U
referred performance obtained using the LT1097 and other popular, low cost precision op amps. Input offset voltage can be adjusted over a 600V range with a 10k potentiometer. The LT1097 is internally compensated for unity gain stability. As shown on the Capacitive Load Handling plot, the LT1097 is stable with any capacitive load. However, the overcompensation capacitor, CS, can be used to reduce overshoot with heavy capacitive loads, to narrow noise bandwidth or to stabilize circuits with gain in the feedback loop.
Frequency Compensation and Optional Offset Nulling
10k POT 1 2 V+
-
LT1097
8
7 5
6
OUT
3
+
4 V-
CS
LT1097*F02
9
LT1097
APPLICATIONS INFORMATION
The availability of the compensation terminal permits the use of feedforward frequency compensation to enhance slew rate. The voltage follower feedforward scheme bypasses the amplifier's gain stages and slews at nearly 10V/s. The inputs of the LT1097 are protected with back-to-back 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, as shown in the voltage follower feedforward diagram, is recommended because this resistor keeps the current below the short circuit limit, resulting in faster recovery and settling of the output.
Follower Feedforward Compensation
50pF
Pulse Response of Feedforward Compensation
10k
5V/DIV
2 5k IN
-
LT1097 6 5 OUT
3
+
0.01F
LT1097*F03
TYPICAL APPLICATIO
Low Power Comparator with <10V Hysteresis
5V 330k 7 10k +IN 10k -IN 2 1k 100k OUT 1 LT1097 3 620k 6 100k 2N3904
10
U
W
U
U
U
Test Circuit for Offset Voltage and its Drift with Temperature
50k* 15V 2 100* 3
- +
7 LT1097 4 -15V 6 VO
50k*
5s/DIV
1097 G20
VO = 1000VOS *RESISTORS MUST HAVE LOW THERMOELECTRIC POTENTIAL
LT1097*F04
- +
4 -5V
LT1097*TA02
LT1097
PACKAGE DESCRIPTION U
Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.255 0.015* (6.477 0.381)
1 0.300 - 0.325 (7.620 - 8.255)
2
3
4 0.130 0.005 (3.302 0.127)
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) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076) N8 1197
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
0.100 0.010 (2.540 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP 0.053 - 0.069 (1.346 - 1.752)
2
3
4 0.004 - 0.010 (0.101 - 0.254)
0.016 - 0.050 0.406 - 1.270
0.014 - 0.019 (0.355 - 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.050 (1.270) TYP
SO8 0996
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.
11
LT1097
TYPICAL APPLICATIO
IN 1V 9M
RELATED PARTS
PART NUMBER LT1490/LT1491 LT1492/LT1493 LT1077 DESCRIPTION Dual/Quad General Purpose Micropower Rail-to-Rail Op Amps Dual/Quad 5MHz Low Power Single Supply Op Amps Single Micropower Low VOS Op Amp COMMENTS Over-The-TopTM Inputs, 50A Supply Current Per Amplifier, 2V to 44V Supply Range, 180kHz GBW 180V VOS Max, 3V/s Slew Rate, 550A Supply Per Amplifier 60V VOS Max, 68A Supply Current, 230kHz GBW, Optimized for 5V Supplies
Over-The-Top is a trademark of Linear Technology Corporation.
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
U
Input Amplifier for 4 1/2 Digit Voltmeter
15V 0.1V 100k 5% 2 0.1V 1V 9k* 10V 100V 1k* 1000V TO 1V FULL SCALE ANALOG DIGITAL CONVERTER
-
LT1097
7 6 4 5 -5V
3
+
10V 900k 100V 90k
1000pF
*RATIO MATCH 0.01%
1000V FN507 10k ALLEN BRADLEY DECADE VOLTAGE DIVIDER
THIS APPLICATION REQUIRES LOW BIAS CURRENT AND OFFSET VOLTAGE, LOW NOISE, AND LOW DRIFT WITH TIME AND TEMPERATURE.
LT1097*TA03
1097FA LT/TP 0398 2K REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1989

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