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The AD7148 is designed for use with capacitance sensors imple-menTIng funcTIons such as buttons, scroll bars, and wheels.The sensors need only one PCB layer, enabling ultrathin applicaTIons. The AD7148 is an integrated capacitance-to-digital converter(CDC) with on-chip environmental calibraTIon. The CDC haseight inputs channeled through a switch matrix to a 16-bit,250 kHz sigma-delta (Σ-Δ) converter. The CDC is capable of sensing changes in the capacitance of the external sensors anduses this information to register a sensor activation. The externalsensors can be arranged as a series of buttons, as a scroll bar or wheel, or as a combination of sensor types. By programming theregisters, the user has full control over the CDC setup.High resolution sensors require minimal software to run on thehost processor.
