VIN+

VIN±

V+

OUT

GND

9

INA138-Q1, INA168-Q1

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SGLS174J – SEPTEMBER 2003 – REVISED AUGUST 2018

Product Folder Links: INA138-Q1 INA168-Q1

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7 Detailed Description

7.1 Overview

The INA138-Q1 and INA168-Q1 devices (INA1x8-Q1) are comprised of a high-voltage, precision operational

amplifier, precision thin film resistors trimmed in production to an absolute tolerance, and a low-noise output

transistor. The INA1x8-Q1 are powered from a single power supply, and the input voltages can exceed the power

supply voltage. The INA1x8-Q1 are ideal for measuring small differential voltages, such as those generated

across a shunt resistor, in the presence of large common-mode voltages. The Functional Block Diagram shows

the functional components within both the INA138-Q1 and INA168-Q1 devices.

7.2 Functional Block Diagram