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The AD9910 Inverse Sinc feature is not working properly on the AD9910 evaluation board.

Question asked by DSB Employee on Apr 29, 2010
Latest reply on Apr 29, 2010 by DSB

We need to use the DDS with "Sync-enabled" so that the output is almost flat and doesn't have the Sinc pattern. To our surprise, we found that the flatness was varying by almost by 2 dB over 20 to 315 MHz band whereas the data sheet shows less than 0.1 dB variation with this feature enabled. Could you please explain this strange phenomemnon and we have tried this on two DDS.

We look forward to an early response from your end.