SBOU258 March 2021 INA4290
The user can either emulate the voltage developed across a sense resistor based on a given set of system conditions with the INA4290EVM, or connect the device inputs to an external shunt. The user can also solder a surface-mount technology (SMT) shunt resistor across the In+ and In– pads, and these inputs can be connected in series with the external system and load. In+ and In- will refer the input of either channel being measured. Jx_n for channel x and Jx_n for channel x. Also shunt resistor is R1_n for channel 1, R5_n for channel 2, R9_n for channel 3, and R13_n for channel 4 will be refered to as Rshunt.
To configure a measurement evaluation without a shunt resistor, follow this procedure:
Connect a 2.7-V to 120-V common-mode voltage to the inputs if the differential voltage supply is a floating supply. Connect the positive lead of the external voltage source to the In– tab and source ground to a GND test point. The minimum common-mode voltage should be >VS. This action effectively raises the absolute common-mode voltage of the input pins, while still retaining a positive input differential signal.
To configure a measurement evaluation with a shunt resistor, follow this procedure:
Make sure that the equipment (shunt resistor, wires, connectors, and so on) can support the amperage and power dissipation first before you measure the current. Also make sure that the current flowing through Jx does not exceed 5 A. Failure to do so can result in hot surfaces (> 55 °C), damage to the EVM, or personal injury.