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VIN+

VIN–

V+

OUT

GND

8

INA138, INA168

SBOS122E – DECEMBER 1999 – REVISED DECEMBER 2017

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7 Detailed Description

7.1 Overview

The INA138 and INA168 devices (INA1x8) 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 devices can be powered from a single power supply and their input voltages can exceed the power

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

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

which illustrates the functional components within both INA1x8 devices.

7.2 Functional Block Diagram