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ADS8167: Effect of conversion result on other bits

Part Number: ADS8167

I am currently trying to perform an analog-to-digital conversion of 8 channels by selecting the auto sequence mode.

I have connected an oscillator as a pseudo-input and am sampling at 1kHz with a sine wave input, but when I graph the conversion results, I find that the signal is rattling.

Bit by bit analysis shows that more than 99% of the values from the 7th bit to the 10th bit are the same.

What could be the cause?