AnsweredAssumed Answered

AD9125 generate sine wave problem

Question asked by feng111 on Jun 15, 2017
Latest reply on Sep 5, 2017 by MicheleV

Hello,

I'm using the AD9125 DA to generate a sin waveform.Use a 4x Interpolation,DACCLKP 400MHZ 、REFCLKP 100MHZ the DCI CLOCK 100MHZ,

The  AD9125 SPI configuration is as follows:

16'h0020
16'h0000
16'h0300
16'h0CD1
16'h0DD9
16'h0AC0
16'h0A80

16'h1BA4
16'h1C00
16'h1D00

16'h1E01

16'h3000
16'h3100
16'h3200
16'h3300
16'h3600

the SPI is read to make sure that it was okay,The sin signal waveform file is generated by matlab and is loaded by FPGA,matlab code refer to the attachment 1  , ad9125 Circuit diagram refer to the attachment 2 ,The image of attachment 3 is seen on the spectrometer for sin signal.

Can someone explain me if I have missed something to do or how I can avoid this behaviour?

 

Thank you for your help!

Regards

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