I am doing a DDS VFO using a Arduino UNO. I have had some problems where the DDS just stops dead. I initially thought it might be my code doing something silly, but after I cut out all the code except for the bare minimum.
I then had a look for a working AD9850 Arduino project and implemented that and the same thing happens. The DDS stops after a few minutes.
I did note that aftre it stops, it needs to be powered down for about 30 secs. before it starts up again. As such it would appear that it is a temperature related fault.
I have just reduced the DDS supply to 3.3 V which is on the UNO board and it is still running OK on either code.
The data sheet permits operation at either level.
Question. Anyone else play with these? What supply voltage do you run them at?
The AD9850 is an eBay special and I suppose they may be using out of spec AD devices! (?)