The AD7747 is a high-resolution, Σ-Δ capacitance-to-digitalconverter (CDC). The capacitance to be measured is connecteddirectly to the device inputs. The architecture features inherenthigh resolution (24-bit no missing codes, up to 19.5-bit effectiveresolution), high linearity (±0.01%), and high accuracy (±10 fFfactory calibrated). The AD7747 capacitance input range is±8 pF (changing), and it can accept up to 17 pF common-modecapacitance (not changing), which can be balanced by a programmableon-chip digital-to-capacitance converter (CAPDAC).The AD7747 is designed for single-ended or differentialcapacitive sensors with one plate connected to ground. Forfloating (not grounded) capacitive sensors, the AD7745 orAD7746 are recommended.
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