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PLL - Loss of Reference Frequency

Question asked by Kevin.G Employee on Sep 29, 2009
Latest reply on Oct 15, 2009 by icollins

Using the ADF4001 with a reference frequency of 60MHz, a PFD frequency of 2.5MHz and an output frequency of 60MHz.  When the reference is lost, the charge pump output is oscillating and the output frequency is all over the place.  Is there a way to have the ADF4001 or other PLL output go to one of the rails when the reference frequency is lost?

 

- Kevin

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