I trying to synchronzie 4 DDS of AD9910 ,but i am not yet there, i aligned the REFCLK of all of them
also the Sync out of the Master is connected to all the slaves by ADCLK846, I have made the SMP_ERR
Latch error bit go to 0 v. and for a minute every thing was aligned also at the Signal output, but when i changed
frequency it didn't save the alignement. I0_Updated is triggered to all the DDS's at once every update, even when one DDS recives information to the register all of the DDS'S get IO_UPDATE. but still at every frequency different phase between the signals and also sometimes one frequency that was aligned after changing the frequency and going back to it ,changes the phase alignment a little.
is someone familiar with this sequence
Thank You in advane
I have synchronized all the 4 DD's,and i am also using the Clear Accum, but it seem that sometimes for each 5 to 6 IO updates the aligned phase is lost and is back after the next IO_UPDAE, also happens when all the profile are changing at once,some times they are not aligned in phase and it goes back to be aligned on the next change of all profiles
what can be the reason for that
I have the same problem. I'm trying to change frequencies from 50 to 350 MHz. Initially, the signals would be in phase and then go out of phase after 4 to 5 iterations randomly and come back to the synchronization state. Is this problem rectified. If so, How ?