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AFE5832EVM: I tested afe5832evm, but the quality of the results was not good

Part Number: AFE5832EVM

I am testing afe5832evm with TSW1400 and HSDC PRO 4.7.

However, I had some question during test.

-1. I connected the hardware as shown in the attached figure and input 5v power.

-2. I wrote afe5832evm firmware after running hdsc pro.

-3. The afe5832evm gui is run automatically,

4.I provide a 5MHz  20mV sine  input

5 I use the 125MHz clock on board according to the user manual

6. I press DUT RESET and initialize device.

7. I changed fsamp to 40mhz and clicked the ramp test pattern.

8. I went back to hsdc pro and clicked the capture button.

Its results are as follows

What's wrong with my testing process? It was simply a test for confirming the test pattern.

 

How do i set up to get the right result?