LT1002 Datasheet, PDF (12/16 Pages) Linear Technology – Dual, Matched Precision Operational Amplifier

LT1002
APPLICATIONS INFORMATION
Two Op Amp Instrumentation Amplifier
R1
100k*
–
INPUTS
+
R5
2.2k+
R2
10k
–
R3
1_{/2 LT1002}
+
10k
R4
100k
–
1_{/2 LT1002}
+
* TRIM FOR COMMON-MODE REJECTION
+ TRIM FOR GAIN
( ) ^{Gain = R4 1 + 1 R2 + R3 + R2 + R3 ≈ 100}
R3
2 R1 R4
R5
OUTPUT
1002 TA10
Precision Amplifier Drives 500Ω Load to ±10V
R_S
100Ω
R_S
100Ω
1.1R_f + 0.1R_S
110k
+15
–
B
1_{/2 LT1002}
+
–15V
100Ω
0.2R_L
R_f
100k
+15V
–
A
1_{/2 LT1002}
+
–15V
500Ω
OUTPUT
R_L
INPUT
1002 TA11
This application utilizes the guaranteed 10mA load driving
capability of the LT1002. The offset voltage of amplifier A
is the offset of the configuration. Amplifier B provides the
additional 10mA load current. When load resistor R_L is
removed, amplifier A sinks this current without affecting
accuracy. In the gain of 1000 configuration shown, ap-
proximately 0.3% gain accuracy can be realized.
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