Hi Mario, Welcome to the TI E2E forums! If you have a schematic of your circuit that you'd be able to share, it would be really helpful. MOSI ("DIN") is an input pin and should be controlled by the MCU, so it shouldn't be active unless you intend for it to be. MISO ("DOUT") is an output pin and it should be active, but only if you provide SCLKs. In your logic analyzer screenshot is "SPI CLOCK" the SCLK (serial clock) or is the the main clock to the ADC (connected to "XTAL2/CLKIN")? It would seem that this clock is not active in every SPI frame (when /CS is low), so this could be a reason why data is inconsistent.
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