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AD9858(dds) frequency sweep problem

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Hi
I am using AD9858 in the frequency sweep mode. the only bit that I have set for sweep is CFR<15> which enables freq. sweep and setting DFTW and DFRRW. SYSclk is 200MHz . but nothing happens and the output is a fix frequency based on FTW register(for 50MHz), I do not know what is the problem?. in addition, what will be the start and stop of ferq. sweeping if I do not send any signal on FUD pin.

tnx
 

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