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AD9739 output with periodical spurious

Question asked by tony1005 on Dec 5, 2017
Latest reply on Dec 17, 2017 by tony1005

Hi!I am encountering a problem with AD9739.my system board with AD9739 is used to produce some waveforms,when ad9739 is clocked in 1G ,the board can get good signal(the output signal freq located  in the second Nyquist zone);while clocked in other  frequency just like 1.4G,the ad9739 can not work well,output with periodical spurious,the period is about 30 microseconds.I have another board almost the same ,but can work properly.I don't know how,so can you help me?

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