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ADF4001 REFin and RFinA inputs are out of phase?

Question asked by barryb on Aug 25, 2011
Latest reply on Aug 31, 2011 by barryb

I have a simple reference loop using the ADF4001 and a VCXO.  The REFin and RFinA inputs are both at 10MHz (phase detector is at 1MHz).  I notice on the scope that these two inputs, pins 8 and 6 of the TSSOP, are almost exactly 180 degrees out of phase.  Is this normal?  Is the part designed this way?

 

It isn't a problem, I just need to know if this is by design, so I can depend on it always being this way.  I cannot tell from the datasheet.

 

TIA,

Barry

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