12

LT1002

Two Op Amp Instrumentation Amplifier

+

–

1002 TA10

R3

10k

100k*

R1

10k

R2

100k

R4

–

+

OUTPUT

* TRIM FOR COMMON-MODE REJECTION

+ TRIM FOR GAIN

Gain =

1 +

+

+

≈ 100

INPUTS

–

+

2.2k+

R5

R4

R3

R2 + R3

R5

R3

R4

R2

R1

1

2

()

Precision Amplifier Drives 500

Ω Load to ±10V

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

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.

+15

–15V

+15V

–15V

1002 TA11

100k

INPUT

OUTPUT

110k

100

Ω

100

Ω

500

Ω

100

Ω

–

+

B

–

+

A