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Failing ADF4350's

Question asked by Subby on Jun 11, 2013
Latest reply on Jun 17, 2013 by rbrennan

Hi all,

 

I am using the ADF4350 for my transmit LO in a SDR.  I get the part working just fine with good results, but then the part just dies on me.  Not sure what's causing the problem.  Circuit and layout both look good.  I did have one issue where the LE line was power up to 3.3 V before the parts power rail was fully up to 3.3V, but the part was fully powered when programmed over the SPI bus.  I can't see how a high LE line before power would kill the VCO output.

 

To help, I've attached image files showing the schematic and layout.

 

Any ideas would be greatly appreciated.

 

Thanks

John

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