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ad9910 spur

Question asked by Maarten on Jan 23, 2012
Latest reply on Jan 23, 2012 by KennyG

We are currently using the AD9910 DDS. Our ref clock is 20 MHz and multiplier is 50 to generate a 1 GHz System clock. When I generate

any frequency a 2.5 MHz spur sits around the main carrier. Why is this? Is there a way to get rid of it?

 

I have tried changing the PLL divider but still the same, aslo the VCO etc. There is no 2.5 Mhz clock on our ref clock which is clean.

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