The AD7745ARUZ-REEL is an integrated circuit (IC) component developed by Analog Devices Inc. It is a high-precision, low-power capacitance-to-digital converter (CDC) with a resolution of 24 bits. The IC is specifically designed for capacitive sensing applications, such as weight scales, touch screens, and proximity sensors.
This IC component features a wide measurement range, from femtofarads up to nanoFarads, combined with a high accuracy of 0.01% of the full-scale range. It offers two fully-differential capacitance inputs, which allow for differential and common-mode capacitance measurements.
The AD7745ARUZ-REEL employs an innovative sigma-delta modulation technique to convert capacitance variations into a digital output. It includes a programmable excitation voltage source, which can be set up to 2.5V, enabling flexibility in measuring different types of capacitive sensors. The IC also provides built-in temperature compensation for improved accuracy over temperature variations.
One of the key features of this IC is its versatility in interfacing with microcontrollers or digital signal processors (DSPs) via a standard serial peripheral interface (SPI) or a two-wire inter-integrated circuit (I²C) communication protocol. This allows for easy integration into various systems and provides compatibility with a wide range of microcontroller platforms
