OUTMAX

IN

V

V

0.5 V

OUTMAX

IN

IN

V

V

0.7 V

V

V

VIN+

VIN-

V+

OUT

GND

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9

INA139, INA169

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SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017

Product Folder Links: INA139 INA169

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Copyright © 2000–2017, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The INA139 and INA169 devices 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 INA139 and

INA169 devices can be powered from a single power supply and their input voltages can exceed the power

supply voltage. The INA139 and INA169 devices are ideal for measuring small differential voltages, such as

those generated across a shunt resistor in the presence of large, common-mode voltages. See the Functional

Block Diagram, which illustrates the functional components within both the INA139 and INA169 devices.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Output Voltage Range

The output of the INA139 is a current, which is converted to a voltage by the load resistor (RL). The output

current remains accurate within the compliance voltage range of the output circuitry. The shunt voltage and the

input common-mode and power-supply voltages limit the maximum possible output swing. The maximum output

voltage compliance is limited by the lower of Equation 1 and Equation 2.

(1)

or whichever is lower

(2)