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About AF5355 PLL

Question asked by eraste on Apr 15, 2015
Latest reply on Apr 17, 2015 by MRichardson

I have two questions about ADF5355 PLL :
1) In the data sheet, it is mentionned that the PLL is a fractional-N one and
in the schematic we can note a "third order fractional interpolator". So, is it
a fractional-N PLL or a delta-sigma PLL ? Because in one case the N divider
takes 2 values (N/N+1) and in the second case it takes 8 random values between
2) I had realized a prototype card with ADM7150 voltage regulator (mentionned
in the datasheet).Unfortunately, the 3.3 V regulator warm-up and the PLL too
(the frequency output is 7500 MHz).Do you know what is the problem ? Any advice
Thanks a lot for your precious answers.