SBOU122B September 2013 – August 2016 INA118 , INA121 , INA122 , INA126 , INA129 , INA141 , INA155 , INA156 , INA188 , INA317 , INA818 , INA821 , INA828
There are multiple methods of applying a reference voltage to the device. A straightforward approach is to apply a voltage to the REF test point with U2 unpopulated. If a buffered voltage is desired, U2 can be populated with an operational amplifier in an appropriate SOIC-8 package and pinout. If the reference voltage is GND, either R5 can be populated with a 0-Ω resistor, or the REF test point can be connected to GND.