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Does the AD9915 use a Sine or Square wave for its REF CLK?

Question asked by Halausteve on Jun 14, 2013
Latest reply on Mar 13, 2014 by LouijieC

I wanted to ask what is the preferred REF CLK input for the AD9914, AD9915 DDS's? 

Sine? Square?


Also, when using the onboard PLL, why does this limit the performance you can achieve on the output?

Is it that it is hard to reach the maximum REF CLK frequency, Or does it introduce phase noise, or other?