I am trying to make my AD9952 to output a 1MHz square wave. Unfortunately I haven't been able to do so, and I have some questions:
1) Is there a rise time restriction for the IO_Update pulse? On the scope the I can use the SPI lines and the data bytes going into the DDS, with the correct format.
2) The SPI mode for AD9952 is Mode 0 right? CPol = 0 CPh=0?
3) To read out of the Registers of the DDS do I need to send an IO_update pulse?
Attached is the schematic of my circuit, I made some modifications, the OSK pin is now grounded, and the resistor attached to pin IO_Sync was changed to a 100 Ohms.