Hello
My customer needs to update the NCO frequency every 3.5uS. He send the FTW using SPI and then uses SYSREF as sync in order to have a deterministic latency and exact time period between each frequency change.
I have read in some application note that when using periodic SYSREF there are spurs at the DAC output. Please provide a method to predict the location and level of those spurs as a function of SYSREF frequency.
If you have other alternatives for a periodic change in the NCO freq without using periodic SYSREF (and still keeping det. latency) and avoiding those spurs please let me know.
Thanks
Izik
