With Refin below min value is there a default output level for the CP pin?
No, if the reference input is lost the charge pump will stay in its last state and the digital lock detect will stay on -- basically a digital circuit with a missing clock and no automatic reset.
The lock detect's staying on with a missing RF or REF input has been fixed in the lastest PLLs. It has been an issue with a few customers.
Thanks for the answer and the additional info on the lock detect.
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