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CDCE62005 PLL lock

Other Parts Discussed in Thread: CDCE62005

We have our own board using the CDCE62005 - it is not locking.

It seems that it is necessary to calibrate the VCO after writing the registers. I am attempting to do this by toggling bit 6.22, but the values read from register 8 for calibration are always 0 is this expected ?

We have a 125MHz primary reference and require mainly 200MHz outputs.

I have used the GUI to generate the following register values using a 2GHz VCO: 

REGISTERS

0       eb8603ef

1       eb8603ff

2       eb4000cf

3       eb8603ef

4       eb8603ff

5       703f9e4f

6       395f8f6f

7       fd98705f

8       ffffffff