Other Parts Discussed in Thread: DAC38RF82, , DAC38RF82EVM, LMK04832
Hi,
We have product which uses LMX2594 as the on-board clock source for the DAC38RF82 on it. One of our customers has reported a problem where a CW tone output from the DAC38RF82 has significant jitter when the fractional part of LMX2594 is used (e.g. a sample rate of 5529.6 MHz). This problem goes away when using an external clock source (e.g. a signal generator) or when the fractional part is not used (e.g. a sample rate of 3200 MHz).
Is this behaviour expected? Are there any software settings available in the LMX2594 to improve the output jitter?
I can attach some plots and register settings from my tests, if it will help with your analysis. I also have the LMX2594EVM and DAC38RF82EVM in case you would like me to perform an experiment using those instead of our board.
Thanks,
Ayush