AD9910 Eval board issues?

Hi,

I am trying to use about a 9 year old AD9910 Eval Board to generate a range of sine waves say upto 400Mhz.

Unfortunately, I feel there are issues with it. There is an output- though but it appears distorted and I am unable to get it locked.

The signal appears to be like a frequency modulated wave even if I am using this in the normal mode.

Checking the signal at the SYNC-CLK (J9) also one sees a similar waveform. This is puzzling.

Earlier when i was using Windows XP, it had worked well. But now I have upgraded to windows 7 pro version- 32 bit.

Would this be the cause of the misbehaviour?

or what could be the problem????

Thanks in advance.

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