3 Hardware

Each of the PCBs on the INA254EVM requires a 2.7-V to 5.5-V power supply connected between the VS and GND test points.

The INA254 family of devices have an integrated shunt of value 0.4 mΩ between the IS+ and IS– pins. Connect a current source and an optional load in series with test points IS+ and IS–. Use a voltmeter on the OUT test point to measure the voltage output of the INA254. Keep the voltage on the IS+ and IS- in the range of –4 V to +80 V at all times.

For the following components, x = 1 to 3, respective to the INA254A1, A2, or A3 devices.

Cx02 are supply bypass capacitors for the INA254Ax.

Rx01 is a 0-Ω resistor that ties SH+ to IN+.

Rx02 is a 0-Ω resistor that ties SH– to IN–.

Rx03 and Rx06 are 0-Ω resistors that tie REF1 and REF2 pins to VS and GND respectively, thereby creating a midsupply reference votlage.

Components Rx01, Rx02, Cx03, Cx04, and Cx05 can be added or replaced to provide optional filtering of the voltages out of the SH+ and SH– pins, and into the IN+ and IN– pins of the INA254.