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DAC38J82: DAC38J82 abnormal output

Part Number: DAC38J82

Hello,

Question1 :

Configuration: LMFK=1:1:2:32  1DAC,non-Interpolation(250Mfs linerate=5G);

The question is that the accmulated waveforms from 0x1000~0xF000 have highe frequency noise, please refer to the waveform, and how to filter this noise?

Question2;

Configuration: If improve the samples rate to 2G and other parameters don't change as above, Interpolation=16,2DAC(2G/16/2DAC=250M)

But there is no any output. so how to set interpolation filter?

Question3:

If using two DACs, does the M of FPGA set 2? The  tx_aresetn of FPGA GTX is high or low sometimes and doesn't work normally.

 

Best regards

Kailyn