AD9739 harmonics is larger

Dear Sir/Madam,

Currently , I do an experiment with  AD9739a-fmc-ebz-revC eval board and xilinx KC 705 FPGA platform, but when measuring the DAC output signal , I found highr harmonics .Startup initialization is similar to recommended at page 62(Data Sheet AD9737A/AD9739A).I've generated sine wave at 250 MHz and was unpleasantly suprised by the level of harmonics, the actual wave figure please see attached pictures. What could be wrong?

Parents Reply Children
No Data