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ADS8558: ADS8558 cannt work after direct substituting the ADI chip AD7658

Part Number: ADS8558

I have an existing design us AD7658 work in parallel and byte mode.

I can use ad7658 but when I change with ADS8558, the system cannt work correctlly.

I have go through the datasheet cant find big different.Ihave notice the Pin 25 26 for ADS8558 is AVdd supply and for ad7658 is DVcc supply,but all connect to 5V should not influence the chip  working.

It will be very appreciated if some master can tell me how to adjust the software or hardware to make it work?