I am trying to follow the programming example in the AD9954 datasheet, where the part is programmed to output a 122 MHz single-tone. After sending the instruction/data bytes, and asserting the IO Update, I still don't see anything on the spectrum analyzer.
Here's a summary of my set-up:
Communicating with a "soft" SPI using the EZ-USB CY7C68013A.
Reset, OSK, PS0, and PS1 pins are grounded
I grounded Reset, OSK, PS0, and PS1 because they're not used in this scenario.
For some reason, the kit I am using has IOSYNC and IOUPDATE connected together with a pull-down 10k resistor to ground. Even if they're tied to together it shouldn't affect my commands as long as I assert IOUPDATE at the very end, correct?
Is there anything I can send to the AD9954 to make it reply to me so I know it's actually receiving commands correctly?
Thank you for your time!