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DDC264 noise vs integration time

Other Parts Discussed in Thread: DDC232, DDC118, DDC264, DDC112

Hello

In previous boards we have used DDC112, DDC118, DDC232. Now we are evaluating the first prototipe of a new board with DDC264, and for the first time I see a different behaviour of noise vs integration time. The DDC264 datasheet show that at lower integration times, the noise is lower. How is this possible? I would expect bigger or equal noise, not lower when increasing the samplig rate.

Best regards