24-bit capacitance measurement in a compact 16-TSSOP
The AD7746ARUZ is a 24-bit capacitance-to-digital converter from Analog Devices, packaged in a 16-TSSOP (4.40 mm width) for surface-mount assembly. It resolves capacitance changes down to sub-femtofarad levels, making it suitable for precision sensing applications like pressure transducers, level detection, and proximity interfaces. Two input channels allow differential or single-ended capacitive measurements, with the 24-bit resolution providing a dynamic range that captures small signal variations against a large baseline capacitance.
Supply and temperature envelope for industrial integration
The serial data interface (I²C-compatible) connects directly to a microcontroller's two-wire bus, keeping the BOM count low. The 16-TSSOP package's thermal impedance is adequate for the low power dissipation of a capacitive sensor front-end.