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high spurs in output of AD136

Product Number: AD9136

hi all:

The signal block diagram is shown below.

I want to get a sine wave of 10MHz.The clk of AD9136 is 245.76MHz. 

But I found high spurs in output of AD9136 after change an othor FPGA(diffrent model).

They are a mix of 10MHz and 122.88MHz's harmonics, like 112.88MHz and 132.88MHz.

They are too high to eliminate. I tried some methods and the spurs do not change.

So I want to known where the spurs probably come from? AD9136 or the FPGA data?