I have not tried the scope yet, but based on what you said, I would assume that the scope can handle the sharp corners for digital square waves? In other words, does the scope have enough bandwidth to capture the SPI signal? By wrapping the ground wire, I think you mean for each digital signal, I will provide a twisted pair with ground wire? I will look into the input voltage as well. Maybe what you say about the signal integrity is true, but I wonder why this problem only happens to DOUT (MISO) but not DIN (MOSI)? All of the SPI pins are connected from Arduino to breadboard, then from breadboard they are splitted to the logic analyzer and the ADS1256 . Thanks, Khoi Ly
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