U1n is the location for the INA2191An test device.

Consider these factors when selecting the appropriate device gain:

• The differential input voltage is either applied across the inputs or developed based on the load current that flows through the shunt resistor.
• Make sure that the output voltage does not exceed the supply voltage. This limiting factor requires attention to device selection.
• The selected device must allow the output voltage to remain within the acceptable range after the developed input voltage is amplified by the respective device gain. The output voltage must remain within the device-specified swing limitations for response in the linear range.
• An output below the minimum allowable output requires a device with a higher gain. Likewise, an output above the maximum allowable output requires a device with a lower gain.