INA188 datasheet(17/41 Pages) TI2

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V+

V-

V+

V-

V+

V-

V+

V-

V+

V-

V+

V-

RFI Filter

VIN-

VIN+

25 k

20 k

VOUT

REF

Zero-Drift

Amp

Zero-Drift

Amp

Zero-Drift

Amp

RFI Filter

V+

V-

V1 = VCM ± G1 (VDIFF / 2)

V2 = VCM + G1 (VDIFF / 2)

G1 = 1 + 2RF / RG

G2 = R2 / R1

VDIFF / 2

VCM

VIN- = VCM ± VDIFF / 2

VIN+ = VCM + VDIFF / 2

VDIFF / 2

INA188

VIN-

VIN+

VOUT

REF

Simplified

Form

VO = G1 x G2 (VIN+ - VIN-)

RLOAD

INA188

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SBOS632 – SEPTEMBER 2015

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7 Detailed Description

7.1 Overview

The INA188 is a monolithic instrumentation amplifier (INA) based on the 36-V, precision zero-drift OPA188

(operational amplifier) core. The INA188 also integrates laser-trimmed resistors to ensure excellent common-

mode rejection and low gain error. The combination of the zero-drift amplifier core and the precision resistors

allows this device to achieve outstanding dc precision and makes the INA188 ideal for many high-voltage

industrial applications.

7.2 Functional Block Diagram

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