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About SYSREF Interface in the AD9625-2.5 ADC

Question asked by Sonu57 on Sep 6, 2014
Latest reply on Sep 10, 2014 by IanB



I am using AD9625-2.5 ADC part in my design.

I am having confusion to interface the SYSREF signal to ADC.



In the evaluation board the SYSREF interface used is as follows


In the JESD204B survival guide it is mentioned that the SYSREF & SYNC shall be DC coupled. That means the SYSREF & SYNC signal shall not have any AC coupling capacitor.

But in the Evaluation board this capacitor is present.


I have used the following configuration for SYSREF in my board schematics without any AC coupling capacitor


Kindly advice me in how to interface this SYSREF signal to the ADC.