Analog Ground ADuCM350

Hi,

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?

Best regards

Ivan

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