Education Library

Frequently Asked Question

I turned off my reference but the Digital Lock Detect (DLD) still says I'm locked.

The DLD circuit is a clocked circuit that requires the Reference be present in order to operate. It is possible to use the "DLD or Loss of Lock" signal to indicate when the reference has been lost. In this mode the charge pump will also be automatically tri-stated and a user intervention will be necessary to take the charge pump out of tri-state (see datasheet).