Using AD7794 with FDA AD8475 in the front end.

Good day.

Is it practicable to use fully differential amplifier like AD8475 to drive ADC AD7794 (instead of AD7192) if only ADC input range is within VREF? Considering 5V supply to ADC, VREF 2.5V and attenuation on FDA 0.4 with CM=VREF would expect bipolar 5V input range. Is there some major mistake here?