8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The INAx191 amplifies the voltage developed across a current-sensing resistor as current flows through the

resistor to the load or ground.

8.1.1 Basic Connections

Figure 8-1 shows the basic connections of the INAx191. Connect the input pins (IN+ and IN–) as closely as

possible to the shunt resistor to minimize any resistance in series with the shunt resistor. The ENABLE pin must

be controlled externally or connected to VS if not used.

ADC

ENABLE

VS

OUT

GND

IN+

IN±

LOAD

Microcontroller

Supply Voltage

1.7 V to 5.5 V

100 pA

(typical)

100 pA

(typical)

0.1 …F

INA191

INA2191 (½)

Bus Voltage

up to 40 V

REF

(1)

(1) REF pin only available on INA2191

Figure 8-1. Basic Connections for the INAx191

A power-supply bypass capacitor of at least 0.1 µF is required for proper operation. Applications with noisy or

high-impedance power supplies may require additional decoupling capacitors to reject power-supply noise.

Connect bypass capacitors close to the device pins.

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INA191, INA2191

SLYS020B – FEBRUARY 2019 – REVISED FEBRUARY 2021

Copyright © 2021 Texas Instruments Incorporated

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Product Folder Links: INA191 INA2191