I noticed that the AD9958 datasheet recommends a loop filter with R=0, C=680pF tied to AVDD.
The Evaluation Board schematic shows R=680ohm, C=680pF tied to GND
(Eval board values seem to be correct as an R = 0ohm would result in severely under-damped loop characteristic).
Which values would be correct?
or a better question:
What is the PLL's VCO sensitivity in MHz/V?
(This value should change with frequency and a chart or tabulated data would be needed).
It would be nice if ADI would integrate the AD9958 PLL parameters into the ADIsimPLL for simulation.