LT1097
Low Cost, Low Power
Precision Op Amp
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FEATURES
DESCRIPTION
50µV Max LT®1097 achieves a new standard in combining low price
1µV/°C Max and outstanding precision performance.
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Offset Voltage
■
Offset Voltage Drift
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Bias Current
Offset Current
Bias and Offset Current Drift
Supply Current
0.1Hz to 10Hz Noise
CMRR
Voltage Gain
PSRR
250pA Max
On all operational amplifier data sheets, the specifications
■
250pA Max
listed on the front page are for highly selected, expensive
■
4pA/°C Max
560µA Max
0.5µVp-p, 2.2pAp-p
grades, while the specs for the low cost grades are buried
■
deep in the data sheet.
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The LT1097 does not have any selected grades, the
outstanding specifications shown in the Features section
are for its only grade.
115dB Min
117dB Min
114dB Min
Guaranteed Operation on Two NiCad Batteries
The design effort of the LT1097 concentrated on optimiz-
ingtheperformanceofallprecisionspecs—atonly350µA
of supply current. Typical values are 10µV offset voltage,
40pA bias and offset currents, 0.2µV/°C and 0.4pA/°C
drift. Commonmodeandpowersupplyrejections, voltage
gain are typically in excess of 128dB.
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APPLICATIONS
■
Replaces OP-07/OP-77/OP-97/OP-177/AD707/
LT1001 with Improved Price/Performance
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High Impedance Difference Amplifiers
Logarithmic Amplifiers (Wide Dynamic Range)
Thermocouple Amplifiers
Precision Instrumentation
Active Filters (with Small Capacitors)
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.
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, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Input Offset Voltage Distribution
Saturated Standard Cell Amplifier
9V
50
6,500 UNITS IN SO PACKAGE
2N3609
6,680 UNITS IN
7
PLASTIC
3
40
+
DIP
13,180 UNITS
TESTED
V
= ±15V
= 25°C
S
A
6
T
OUT = 1.1V TO 8.0V
LT1097
4
AS 1.8k ≤ R2 ≤ 135k
2
30
20
10
0
–
+
1.018235V
SATURATED
STANDARD
CELL #101
EPPLEY LABS
NEWPORT, R. I.
R2
R1
20k
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
–50 –40 –30 –20 –10
0
10 20 30 40 50
INPUT OFFSET VOLTAGE (µV)
STANDARD CELL ON POWER DOWN.
LT1097 • G01
LT1097•TA01
1