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AD9952 Frequency Tuning Word

Question asked by FatSpock on Aug 21, 2013
Latest reply on Aug 22, 2013 by DSB

Hi,

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.

Thanks.

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