LT1002_15 Datasheet, PDF (12/16 Pages) Linear Technology – Dual, Matched Precision Operational Amplifier

LT1002
APPLICATIONS INFORMATION
Two Op Amp Instrumentation Amplifier
R5
2.2k†
R1
R2
R4
100k*
10k
100k
–
INPUTS
+
–
1/2
LT1002
+
R3
10k
–
1/2
LT1002
+
OUTPUT
1002 TA10
* TRIM FOR COMMON-MODE REJECTION
† _{TRIM FOR GAIN}
( ) ^{GAIN = R4 1 + 1 R2 + R3 + R2 + R3 ≈ 100}
R3
2 R1 R4
R5
Precision Amplifier Drives 500Ω Load to ±10V
1.1R_f + 0.1R_S
110k
R_S
100Ω
15V
–
B
1/2 LT1002
+
–15V _Rf
100k
0.2R_L
100Ω
R_S
100Ω
15V
–
A
1/2 LT1002
+
INPUT
–15V
OUTPUT
R_L
500Ω
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.
1002fb
12