VIN+

VIN-

V+

OUT

GND

INA139, INA169

SBOS181E – DECEMBER 2000 – REVISED DECEMBER 2015

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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 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

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

(2)

(whichever is lower)

7.3.2 Bandwidth

keep the capacitive load on the output to a minimum. Reduction in bandwidth due to capacitive load is shown in

the Typical Characteristics.

8

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