signal generate by the evel ad5930


I have an eval ad5930 ebz and i need to generate a signal from it between 10 mhz to 20 mhz so i use the software to program the ad5930 i make Start freq = 10mhz , freq increment = 1 mhz and number of incr =10 , the output signal =sin ,the output profile=triangular sweep and the output mode = outo increment -outo burst ,tint=1000 and tburst=500.

when i see my signal with oscilloscope the frequency change very fast and it is not a perfect sinusoid so what i need to do to have a pure signal

if i need a filter  what kind of filter i need



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