By reducing the +12V common- mode voltage, an INA122 can sense the voltage drop across a shunt resistor while being powered by the same +12V power supply. Rg controls the voltage gain of U1. This circuit is scaled for a 2.5V output range centered around +1.25V; thus this amplifier can measure bidirectional shunt current. An INA122 does not feature a R-R output so the sinking current is limited to about -0.3A. This can be useful where battery current must be monitored while it is being charged or discharged. Bypass capacitors are not shown. (Circuit is created by Tucson)
Shunt Amplifier with Offset Output circuit:
Online Simulation of a Shunt Amplifier with Offset Output Circuit:
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