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CDCM6208: CDCM6208 Lock Up Time measurement variation

Part Number: CDCM6208

Hello,

 

My customer is using CDCM6208, fPFD=40KHz and measuring Lock Up time.

According to calculation, it takes 6.4s form step 3 to step 5.

They are observing ~6.5s lock-up time, but sometimes it is ~half, 3.2s.

What could be a root cause?

If the default VCO range after power up matches desired value incidentally, Step 5(VCO calibration) could be skipped?

 

Best regards,

 

K.Hirano