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AD9957 DAC Output Spectrum issue

Question asked by Orbel on May 14, 2014
Latest reply on Mar 28, 2015 by zygmund

Hello All,

 

I am working on a project where we use AD9957, we already have done some prototypes and everything was ok but now we have some issue with latest prototype spectrue at the output of DAC is very noisy and there is tone aside from carier at 250 kHz frequency (picture attached) can you help me to figure out what is the issue? The only change we did from previous prototypes was that we connected 1.8 V to one source after DC/DC converter, and no other changes.

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