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use external source for the ad9956 inputclock how to set

Question asked by sunhua on Jul 26, 2017
Latest reply on Jul 27, 2017 by sunhua


I want to use AD9956 to generate sine signal for my project, I only use the frequency modulation the other function I do not to use.I want to use external signal source (400MHz)direct for the dds inputclock ,I don't need PLL function for my project,how I do? Tie the PLL_LOCK PIN,CP_OUT PIN,PLLREF PIN and PLLOSC PIN with a resistor to ground ,and disable PLLREF Crystal disable and poerdown PFD INPUT, that will be ok? The below file is the Schematic.