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About the REFin CLK of ADF4356

Question asked by WJCaaaaa on Mar 1, 2018
Latest reply on Jun 8, 2018 by kpeker

Dear Sir/Madam,

      I am using ADF4356,finding that when I complete configuration, the ADF4356 can output a signal with fixed frequency even if there is no REF CLK input .For example ,I want a 100M signal, then I write appropriate parameters in its registers, but I will get a 75M signal, when I remove the REF input CLK, the 75M signal is still there,I have tried 3 ADF4356s, the situation is the same.I wonder to know whether the PLL can generate reference clk itself or not? or the methods to solve the problem.

      Thank you very much.