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Output is not getting locked in PLL hmc765 evaluation board

Question asked by kcairani on Jan 17, 2017
Latest reply on Oct 20, 2017 by grumata

I am  using HITTITE HMC765LP6CE(125536-3)  evaluation board with Hittite USB Interface(121726-2). The hardware setup is made as shown in the "User Manual - Software & Hardware Installation for all HMC PLLs & PLL with Integrated VCOs PDF" document. For testing purpose the register values are loaded as per the reference  provided in the GUI interface. No further change is made in the GUI.
 It is  observed that, output is not getting locked(in 20kHz span).

The same thing was observed on HMC830 evaluation board.

Please guide regarding the solution of the present problem, and necessary changes to be made.