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AD7780 non-ratiometric usage


I'm wanting to use the AD7780 in a non ratiometric configuration which means that Vref does not equal AVDD. Page 3 of the datasheet says that the  Differential input Voltage Range = +/-Vref / gain when the assumption is that Vref = AVDD. Does this equation still apply in the configuration i want to use it?


Voltage REFIN = 2.5V (REFIN+ = 2.5V, REFIN- = GND)

According to the equation above the input would be limited to 19.5mV differential input voltage at 128 gain. I'm wondering if the input range is actually defined by AVDD?



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