How is the common-mode input range for the reference inputs set on the AD719x ?
The input rang is dependent on the reference voltage, unipolar /bipolar mode selection and the gain setting chosen.
In unipolar mode the input range is given as [ VREF(+) - VREF(-) ] / Gain.
In bipolar mode, the input range is given as [ VREF(+) - VREF(-) ] / Gain.
The gain setting for the PGA is set using bits G2, G1 and G0 in the configuration register. The reference is nominally equal to AVDD but the AD719x can be operated with a reference from 1 V to AVDD. When the device is used in fully-differential mode, the common mode voltage can be varied but the user must ensure that the absolute voltages on the positive and negative analog input terminals are within the specified ranges.
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