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AD9914 spurious close to base frequency

Question asked by SampoS on Mar 20, 2015
Latest reply on Mar 23, 2015 by SampoS

Hello all,

 

I just got an AD9914 evaluation board and started measuring its performance. The board is pretty much operating as specified in the datasheet, excluding some spurious frequencies near the base frequency. The signals are at +-6.3 kHz and +- 12.6 kHz, regardless of the base frequency (see the attached pictures). I am using a Connor Winfried DOT050F 10 MHz oscillator as the reference clock, and Tracopower TSR 1-2418 DC-DC converters for the DC power. I tried using a signal generator as a reference clock but it made the phase noise too high to distinguish the possible spurious underneath.

 

Any ideas about the origin of the spurious?

 

Thanks!

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