I have left my AD9959 running (It has a 25 Mhz clock with a 20x multiplier and a 125Mhz output freq. on channel 0) all morning. Earlier today after a few hours, I noticed that the multiplier and output freq I had enabled had been reset (no output on channel 0 and no multiplier enabled). I didn't think much of it. Maybe I bumped a wire and it caused the board to loose a connection with my microcontroller. So I re-enabled the settings. Approx. 2 hours later I find that the board had reset itself yet again. I haven't touched a thing, and I thought maybe it is more than a coincidence.
So I guess my question is, does this DDS have some type of internal idle/reset feature that activates when left alone for too long?