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Query on Input Filter for ADC and Grounding of AD1937

Question asked by harinder on Apr 17, 2015
Latest reply on Apr 17, 2015 by DaveThib

Hi,

 

We are using AD1937 in one of our designs.

 

  1. Attached is the ADC input filter scheme given in datasheet and in the reference schematics. In both the schemes, we see that the N and P (INL1+ and INL1-)of the ADC input to the chip are swapped. Please let us know which scheme we should follow.
  2. Also there is only one GND used in the reference schematics for AGND and DGND. But the decaps of the AVDD are connected to another GND. Please let us know what that GND is and how to connect that. The reference is attached.


Thanks.


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