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ADF4351 Vref

Question asked by kmm on Aug 23, 2014
Latest reply on Oct 31, 2016 by rbrennan

Hi, Could someone help me to understand how the Vref is generated and used within ADF4351? In one of our board, Vref for ADF4351 is showing 350mV. For that component the lock detect is not going high and no output is coming out from it. However on another working board the Vref measures 2.5V and the Lock detect is also high and the output comes out properly from ADF4351. What could be the reason in the non-working component for Vref to show 350mV. Does it mean that the component itself has gone bad or it can happen due to some problem in the external circuit to ADF4351? A prompt response will be highly appreciated.