9 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.

9.1 Application Information

The INAx180 amplify the voltage developed across a current-sensing resistor as current flows through the

resistor to the load or ground.

9.1.1 Basic Connections

Figure 9-1 shows the basic connections of the INA180. 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.

Power Supply, VS

2.7 V to 5.5 V

ADC

Microcontroller

Bus Voltage

±0.2 V to +26 V

RSENSE

GND

VS

Load

IN±

IN+

OUT

+

±

CBYPASS

0.1 µF

Single-Channel

TI Device

NOTE: For best measurement accuracy, connect analog-to-digital converter (ADC) reference or microcontroller ground as closely as

possible to the INAx180 GND pin, and add an RC filter between the output of the INAx180 and the ADC. See Closed-Loop Analysis of

Load-Induced Amplifier Stability Issues Using ZOUT for more details.

Figure 9-1. Basic Connections for the INA180

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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INA180, INA2180, INA4180

SBOS741H – APRIL 2017 – REVISED JULY 2022

Copyright © 2022 Texas Instruments Incorporated

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Product Folder Links: INA180 INA2180 INA4180