AD7606 has no DGND for Vdriver，should it be separated AGND from the DGND which from MCU,or a whole ground plane could be shared by AD7606 with MCU?
The AD7606 should be design to separate the DGNDs and AGNDs and confined to different areas of the board. A single ground plane can be use or a split, digital or analog. But both of them should be joined in only one place and preferably as close as possible to the AD7606.
You may check the AD7606-Eval board as reference, schematic and layout are available.
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