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nrf52 SAADC noise

Hi, I would like to know how much noise I have to expect with the SAADC.

I tried the example "saadc_pca10036" and attached the pin P0.02 (AIN0) to a ground pin on the pca10036 board and I get values between -2 and -5, that is a noise of about 3. Is this correct? Moreover why I get negative values? I tried also with a custom board and I get similar results.

From the electrical I read that the "differential offset error" is +-15, what exactly means this value?

I noticed also that that there is a "tasks_calibrateoffse", what is the purpose of this?

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