I'm designing a 4-layer board with the ADAU1701.
On the board is also:
Buck regulator for ADAU1701 digital power
Linear regulator for ADAU1701 analog power
Linear regulator for op-amps
Op-amps for input and output filters
Will I attain best performance from the ADAU1701 if I use a single ground plane for all ADAU1701 components as the datasheet suggests? Or will it work better with a separate analog ground plane (joined to digital under the IC) for AVDD, PVDD, CM, PLL-LF, FiltA, FiltD components?
Additionally, would you recommend a ground island around the crystal and load capacitors?
[edited by: ssashton at 3:42 PM (GMT -4) on 3 May 2022]