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Distortion in AD9910 PCBZ output

Question asked by tifr on Jul 26, 2012
Latest reply on Jul 26, 2012 by sitti

I have the AD9910 PCBZ evaluation board which was working satisfactorily. This was not used for about a year. Now, as I wanted to use it, I observe that the output in the single tone mode appears Distorted (2)  Arbitary Frequency modulated .

The output responds to the changes made in the Profile window. But as the waveform is heavily distorted & sort of frequency modulated  i have been facing a problem. Iam attaching the snap shot of the Output taken as the Board is powered On and the RESET buton on the Software clicked.

 

My query is as follows:

What could be the reason for this behaviour?

What are the possible solutions?

Any other advice would be much appreciated.

Thanks,

PGR

 

Please note: All the 3 files are taken of the same signal but at different timescales as indicated.

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