I have a doubt regarding the reference of the analog ground plane for the ADuCM350 evaluation board.
In the evaluation board the USB used for debugging also provides the supply for the system, and the USB ground is connected to DGND; if LK10 is open (which is the jumper that connects DGND and AGND), how is referenced AGND?
If you open LK10, AGND will be floating. LK10 is there to have an option to separate the ground and power the board using multiple supplies for digital and analog. This adds flexibility on evaluating the ADuCM350