One of the key features of the AD8210 bidirectional current sense amplifier is the ability to offset the output to a voltage between 0 V (GND) and VS (supply voltage). This allows the user to bidirectionally monitor the current flowing through the input shunt resistor while still operating from a single 5 V supply. Typically, bidirectional operation is achieved by connecting one VREF pin to the supply and the other pin to GND. In this mode, the output of the AD8210 starts at VS/2 and rises or falls depending on the direction of the current flowing through the input. The AD8210 output can also be offset using an external reference voltage ranging from 0 V VREF to VS. The configuration shown in Figure 1 uses a 3.3 V ADC supply and offsets the output of the AD8210 to achieve bidirectional operation.
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