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AD9915 datasheet Figs. 17, 20 & 21

Question asked by bernardm on Jun 3, 2016
Latest reply on Jun 3, 2016 by JLKeip



With reference to page 14 in the AD9915 datasheet. There seems to be disparity between the residual phase noise at an output frequency of 978 MHz when comparing Fig. 17 to Figs. 20 & 21. Can someone clarify the reason for this difference?


I'm interested in specifying the DDS reference oscillator's phase noise requirement as a function of the system's output phase noise specification.