AD7746ARUZ Capacitance-to-Digital Converter

The AD7746ARUZ is a high-performance, 24-bit capacitance-to-digital converter (CDC) from Analog Devices Inc., designed to deliver precise capacitance measurements with a high degree of accuracy and resolution. This integrated circuit is an ideal choice for applications requiring the measurement of small capacitance changes, such as in sensor interfaces, material analysis, and process control systems.

Featuring a 24-bit sigma-delta analog-to-digital converter, the AD7746ARUZ is capable of detecting very small changes in capacitance, on the order of aT (attofarads). It provides a direct digital output corresponding to the capacitance measured between two sensor plates, making it suitable for use in applications such as humidity sensing, liquid level sensing, and touch sensing.

The device supports two capacitance input channels, which can be used for differential or single-ended measurements, and includes an on-chip temperature sensor to enable temperature compensation of the capacitance readings. The temperature sensor can also be used for temperature measurement purposes, providing additional functionality for system monitoring.

The AD7746ARUZ offers user-selectable output data rates, allowing designers to choose the optimal balance between noise performance and measurement speed. Additionally, it includes an on-chip voltage reference and a programmable gain amplifier (PGA), enabling the device to accommodate a wide range of sensor capacitances.

For easy integration into digital systems, the AD7746ARUZ communicates via an I2C-compatible serial interface, which allows for straightforward connectivity with microcontrollers and other digital components. The device is housed in a compact 16-lead TSSOP package, making it suitable for space-constrained applications.

Key features of the AD7746ARUZ include:

• 24-bit resolution capacitance-to-digital conversion
• Dual capacitance input channels for differential or single-ended measurements
• Integrated temperature sensor for compensation and monitoring
• User-selectable output data rates for flexible noise performance
• On-chip voltage reference and programmable gain amplifier
• I2C-compatible serial interface for easy communication
• Compact 16-lead TSSOP packaging

With its high resolution, multiple input channels, and integrated temperature sensor, the AD7746ARUZ from Analog Devices Inc. is a versatile solution for a wide range of precision sensing applications.