I'm a student and I'm working on my first project with a DDS. My project consists in making the communication between the DDS and a MBED controller via SPI. The pins I have been using to try it are:
AT THE U5 IO HEADER:
AT THE U6 IO HEADER:
AT THE U9 IO HEADER:
About the IO_UPDATE and the EXT_PWR_DWN I didn't understand their behavior. Can Someone help me?
Thanks for the attention,
Check out this document for the basic things to be checked when using the DDS evaluation board via external control. As for the IO_UPDATE and EXT_PWR_DWN, the IO_UPDATE transfers programmed data from the buffers to the active registers while a high on EXT_PWR_DWN will initiate the currently programmed power down mode. If unused, it is advisable to connect this pin to ground.
I found out that I hadn't defined the MASTER_RESET status. Now I sent one pulse to it, and the SYNC_CLK output is responding to changes in the CFR2's 22nd bit.
Thanks for the help,