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why the AD9739A cannot generate a square wave?

Question asked by leihaha1 on Oct 23, 2013
Latest reply on Nov 4, 2013 by danf

when I use the AD9739A to generate a sine wave,it is very good.But when i use it to generate a square wave , like a 15MHz square wave , the AD9739A generate some strange waves,like noise with some pulse,but it's spectrum is good, in 15Mhz , 45MHz, 75Mhz and so on, there has a Envelope。so I want to ask why ? thank u.(the a/d coveting frequency is 800MHz)