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Digital Discovery Logic input noise


Sid Price

Question

I am having trouble with my Digital Discovery. I am getting noise displayed on the digital inputs. For example, I have a 400KHz clock on DIN0 and the data is supposed to be on DIN1. I need to trigger on the DIN1 negative edge. What I see, while DIN1 is actually a constant "1" (verified with 'scope) is glitches on some falling edges of the clock (DIN0). If I ground DIN1 I still see glitches on that input. I have tried switching tot DIN3 for the data but still see the same pulses

The attached screen capture shows DIN0 on CLK and DIN1 on the data input. As I said, my 'scope does not show these glitches. The DD is grounded using the ground input next to DIN0.

NOTE: I tested the same PCB with my AD2 and it does not show the glitches, in fact it works fine.

DD_Glitches.PNG

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