INA4181A1IPWR.B datasheet(23/62 Pages) TI2

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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 INAx181 amplify the voltage developed across a current-sensing resistor as current flows through the

resistor to the load or ground. The ability to drive the reference pin to adjust the functionality of the output signal

offers multiple configurations, as discussed in previous sections.

8.1.1 Basic Connections

Figure 8-1 shows the basic connections of the INA181. 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

CBYPASS

0.1 µF

Single-Channel

TI Device

ADC

Microcontroller

Bus Voltage

±0.2 V to +26 V

RSENSE

GND

Load

IN±

IN+

OUT

REF

NOTE: To help eliminate ground offset errors between the device and the analog-to-digital converter (ADC), connect the REF pin to the

ADC reference input and then to ground. For best performance, use an RC filter between the output of the INAx181 and the ADC. See

Closed-Loop Analysis of Load-Induced Amplifier Stability Issues Using ZOUT application note for more details.

Figure 8-1. Basic Connections for the INA181

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

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

Connect bypass capacitors close to the device pins.

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INA181, INA2181, INA4181

SBOS793H – APRIL 2017 – REVISED NOVEMBER 2023

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