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AD6688 Spur at 2x the output sample rate

Question asked by Sh1 on Jul 17, 2018
Latest reply on Aug 1, 2018 by UmeshJ

To Whom it May Concern,

   I am running the AD6688 at a sample rate of 3GSPS. The NCO is set to convert 1GHz to DC and the decimation factor is 6. On the output spectrum I see a component at DC (1 GHz before down conversion) at -83 dBFS. What I have found is that by adjusting the clock phase (0x0109), fine delay (0x0112), and super fine delay (0x0111) I can lower this component to less than -96 dBFS. Is this expected?

 

Thanks,

Shawn

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