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FDC2112: Differential vs single ended sensor

Part Number: FDC2112
Other Parts Discussed in Thread: FDC2114

Hi! My application for the FDC2114 involves capacitance sensing of two pads that are spaced <5um apart. The datasheet says:

The single-ended configuration allows higher sensing range than the differential configuration for a given total sensor plate area. In applications in which high sensitivity at close proximity is desired, the differential configuration performs better than the single-ended configuration.

Could you elaborate on why the differential configuration performs better? Thank you!