AD7738 circuit details:
REFIN+ and AINCOM connected to 2.5V reference, REFIN- connected to ground.
Analog input voltage ranges selected as +/- 1.25V.
MUXOUT+=ADCIN+ and MUXOUT-=ADCIN-
AVDD connected to 5V
What is the range (min and max) of external voltage that can be connected to perform