I found the synchronization signal coming from sycn pin only can arrive PLL2, if I want to design multiple HMC7044 being synchronization, can I use the PLL1?
Or if I want to use the PLL1, the prescaler must be set 1?
I could not exactly understand your question. SYNC signal can be used independent of the PLL1. SYNC signal is sampled with OSCIN so there is not a direct relation with PLL1.
While multiple HMC7044 is being synchronized, OSCIN to multiple chips should be synchronized. PLL1 can be used for this purpose. In this configuration CLKIN frequency should be less than or equal to OSCIN frequency. Prescaler value is not critical.
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