16-bit touch controller for the best user experience.
In data conversion, analog is everywhere.

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For more information on ... Order Samples About the AD7142 Application Notes Technical Article Product Reviews Evaluation Board/Tools Online Seminars Capacitance to Digital Converter Selection Table

AD7142... Programmable Capacitance-to-Digital Converter with Environmental Compensation

For products with increasing feature convergence, finger-driven navigation enhances the user experience - for designers as well as consumers. The AD7142 is a programmable 14-channel capacitance-to-digital converter (CDC) that enables the design of contemporary touch controls or multiple applications, such as consumer electronics, medical instrumentation, automotive applications, industrial equipment, and PC peripherals. It can be programmed for a variety of navigation functions including buttons, sliders, scroll wheels and joypads. The AD7142, with on-chip environmental compensation delivers unmatched touch control performance. It offers reliable performance over supply and temperature; improved touch sensitivity is enabled by the automatic environmental calibration and adaptive sensitivity; and low power dissipation of 1mA in full power mode, and 50uA in low power mode, both of which are 50% lower than competitive solutions. Comprehensive development tools, such as reference designs and host software are also available, to reduce time to market.

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AN-283: Sigma-Delta ADCs and DACs (pdf, 1,740,324 bytes)
Overview of Sigma-Delta Concepts: Oversampling, Noise Shaping Using the Sigma-Delta Modulator, Digital Filtering and Decimation.

AN-388: Using Sigma-Delta Converters-Part 1 (pdf, 604,216 bytes)
When to Use/How to Use Sigma-Delta ADCs; Part 1.

AN-389: Using Sigma-Delta Converters-Part 2 (pdf, 604,532 bytes)
When to Use/How to Use Sigma-Delta ADCs; Continuation of Part 1 Discussion.

AN-829: Environmental Compensation on the AD7142 (pdf, 104,433 bytes)
The Effects of Temperature and Humidity on Capacitance Sensors

AN-830: Factors Affecting Sensor Response (pdf, 165,786 bytes)
Capacitance sensing gives the user an interface with greater sensitivity and control than standard mechanical input technologies.

AN-833: Using the AD7142 and a Capacitive Sensor to Develop a Single-Push Digital Shutter Button (pdf, 101,815 bytes)
Describes how the AD7142 can be combined with a capacitive sensor ring to implement a single-position digital camera shutter button similar to a traditional 35 mm SLR camera.

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* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

The CDC converters are based on Analog Devices' proprietary sigma-delta data conversion technology.

Find out more about this technology and our wide range of sigma-delta converter products.

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