AD9634 digital signal rippling interference

duyongjiu

on Oct 18, 2020

Hi, I am using AD9634.When I use the test mode and use ramp out, I observed some glitches. as shown in the first feagure.

then I use a oscilloscope to check the digital signals, I I observed that, the digital signal from the scope looks wierd. it is supposed to be a square wave. but there are strong rippling interference there.

Can anyone help analyze what is the issue?

Thanks

0 duyongjiu
on Oct 18, 2020 6:33 PM
Here is a new test with a second board with ad9634. I just use an osilloscope to test one of the digital output when I use ramp test mode.
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0 duyongjiu
on Oct 19, 2020 4:30 PM in reply to duyongjiu
Now I got it. the oscilloscope waveform is correct. because one pin is time shared by 2 bits. the ripple happends when 2 bits with different value are in time-sharing period. I adjusted the DCO delay, and it is good now.
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