There is a ERROR in the ADIsimPLL for the HMC parts.
The 1/f flicker specification for AD parts is made at 10 kHz offset normalized to 1 GHz.
The HMC parts are specified at 1 Hz offset at a normalized frequency of 1Hz.
Your simulator does not take the corrections for this difference into account and ends up under-reporting the flicker noise contribution by 140 dB.
Using the incorrect HMC flicker parameter in ADIsimPLL for design choices has left me scrambling with my design failing by 6dB at 10-1000Hz..
Please correct the flicker parameter for the HMC parts before this burns anyone else.