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AD9739A output signal Harmonic

Question asked by xuyuan352 on Jul 25, 2017
Latest reply on Aug 8, 2017 by Clarence.Mayott

I use AD9739A to generate signals  by FPGA  DDS .Harmonic figure as follows, which is particularly evident,especially the 2 harmonic. Connection is as Official schematic.connect a 90 ohm resistor and balun chip.the clock is generated by ADF4350. What is the problem? hope to help! The signal frequencies in the picture are 30MHz,100MHz and 200MHz.