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GNDs problem

Question asked by on May 16, 2018
Latest reply on May 18, 2018 by isantos

Dear Sir/Madame,

I have a question related to the  DAC "AD5761ARUZ" device (this is the full chip's reference). 

In my case, the SPI communication with the DAC is not working unless I connect the DGND to AGND! I came through all the examples (that i could find) in EngineerZone besides the schematic of the evalution board, and all of them connect both GNDs together , is this necessary? 

In my application, I would like to keep the both GNDs separated, so I have designed a board with special care for this issue.  Please find here below the schematic of used DAC.

Thank you in advance for your help.