Hi Ragavendra,
Basing from your Block Diagram I just need to confirm if the 5V of the USB goes directly to the AVDD pin of the ADuCm360? Please note that the ADuCM360 has an absolute maximum rating for the AVDD of 3.96V as seen on page 17 of the ADuCM360 Datasheet(Rev.B).
Regards,
Thomas