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ADF4360-9 Moisture Sensitivity

Question asked by JayG on Oct 7, 2010
Latest reply on Jun 14, 2012 by bbalkir

I'm using an ADF4360-9 to generate about 124MHz clock using the divider output.  Everything works fine until I cold tested (-40C) and noticed that lock was lost.  I narrowed it down to moisture across any loop filter cap by dampening the end of a wood stick and placing it across any cap at room temp, and lock would be lost.  Lock would usually restore itself after removal of the moisture or stick.

 

I thought that the high impedance series resistor in the loop filter may be an issue so I lowered it from 50k to 1k (little effect on the dynamic response) but it showed no improvement.  Loop filter is shown below.

 

Any suggestions?

 

LOOPFILT.bmp

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