JAJSPU3 May 2024 INA791B
ADVANCE INFORMATION
Figure 6-6 shows two equal resistors R1 and R2 connected between VS and the GND pins divide the supply at half, and by connecting REF pin to the divided supply, output is set to mid-supply voltage. The mid-point of these resistors is buffered using external operational amplifier to avoid loading of resistors resulting in error. The output is set to middle of the supply when there is no differential input voltage or 0A current in shunt resistor. This method creates a ratiometric offset to the supply voltage, where the output voltage remains at VS / 2 when 0A of current flows through internal shunt resistor.