AnsweredAssumed Answered

ADF4355 not locking

Question asked by irek_sz on Dec 20, 2016
Latest reply on Dec 26, 2016 by irek_sz

Hello,

I'm using my custom PCB with ADF4355 and it doesn't lock.

Programming seems ok, checked with power down on/off.

Setting:

Fpdf=20MHz, Fref=10MHz, Fout=5GHz

I attached files for AdiSimPLL.

Here PLL config:

I checked R and N dividers via MUX output, for R is 20MHz, for N is about 13,2MHz.

Fout is 3,31GHz instead of 5GHz and Vtune=4,7V

I changed PDF polarity and got Fout=3,25GHz and Vtune=0,5V

What could be wrong?

 

Regards,

Irek

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