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ADC12DJ3200: How to calibrate the input buffer offset?

Part Number: ADC12DJ3200

In the data sheet of the ADC12DJ3200, in section 7.4.7, it specifies that the calibration for the input buffer offset is not done by the foreground and background calibration. It also says that there is a separate calibration provided to correct the input buffer offsets. The next two paragraphs then go on to describe offset calibration from what I understand and not input buffer offset calibration. Am I misinterpreting this? Or is the rest of the section actually describing the input buffer offset calibration. Input buffer offset calibration does not seem to be mentioned anywhere else in the data sheet. Thank you for the help.