I am bringing up a setup with the AD9554 eval board using a referenceA with 125MHz and system clock of 25MHz but the GUI states my reference is not valid and the PLL is in freerun (see below). I did verify the Reference (single-ended) with Vp-p=1.3v Vmax=680mV and Vmin=630mV
the status below shows that RefA is not valid
My questions are:
1. Is the frequency I configured (125MHz) a valid config?
2. Are the voltage level defined above valid?
3. If the frequency/voltage level all valid then what could be the issue that the refA is invalid and the PLL is in "freerun"?
Please let me know.