I have a question from our customer about changing clock frequency for AD9162 CLK input.
He use AD9162 as NCO only mode. (He does not use SERDES data inputs)
He said, he will change the ferquency of CLK while the AD9162 is running.
And he asks me,
" After change the CLK frequency, I will set new value to FTW register. If I need to set other register, please let me know."
Does he need more configuration for AD9162 other than updating FTW register ?
After changing the clock rate, the DAC needs to be reset and startup sequence mentioned on page 82 of the datasheet needs to be followed again to setup the DAC properly. While the DAC is working if you jump to a different DAC clock frequency, it is highly likely that the DAC DLL doesn't lock to the new clock. Even if the DLL does so, there is a good chance that a glitch in the internal clock circuit happens and make the data unreliable.So, whenever you change the clock rate, reset the DAC and follow the startup sequence.
Thank you for your reply.
I could answer to the customer.