As specified in the data-sheet it depends on input-mode (buffered / un-buffered), gain ...
So the max. voltage span is AGND to AVDD. Depending on the source you can use a simple voltage divider to bring the 0V to 5V down to 0V to AVDD used. But keep in mind the input current and possibly that you need to bias the signal. So what is you source looking like? Can you provide a small schematic of your intended connection to the ADuCM360 inputs?