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ADF4350 PLL output is Oscillating continuously

Question asked by sugu89 on Nov 24, 2014
Latest reply on Dec 11, 2014 by RobThorpe


  We are using your PLL part: ADF4350 for our 1060MHz output generation as per the attached circuit.

The 1060Mhz output is working fine and verified in two boards. But the same is not working in third board and output is oscillating continuously.

So we have measured the impedance and Pin voltage in working and not-working boards (for comparison) and the results are attached for your reference.

We found impedance variation in Vcom, Vref Pins and Vtune, Vref voltages are oscillating in not-working PLL board after 1060Mhz Configuration.

Kindly suggest a Solution/Route cause for the above problem to proceed us further.


Sugumar K