AD7747 - zero scale capacitance

Hi ADI Experts,

I'm having a problem on setting the zero-scale capacitance, below sentences are copied from the AD7747 datasheet. Can you explain on this. Appreciate if can provide me direction step by step.

"One method of adjusting the offset is to connect a zero-scale capacitance to the input and execute the capacitance offset calibration mode. The calibration sets the midpoint of the ±8.192 pF range (that is, Output Code 0x800000) to that zero-scale input."

Thank you in advanced.

Regards,

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