Capacitance-to-Digital Converter (CDC) Technology
... Enables High Accuracy Capacitance Sensing for Industrial, Medical, Automotive, and Consumer Applications


16-Bit Touch Controller

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AD7147... CapTouch® Programmable Controller for Single Electrode Capacitance Sensors

The AD7147 is a programmable capacitance-to-digital converter (CDC) for handheld consumer electronics that enables the design of contemporary touch controls that are paper-thin, yet highly reliable. The low power device has the capability to automatically adjust to rapidly changing climatic conditions, making it ideal for mobile environments. The configurable AD7147 features 13 capacitance inputs and femto farad resolution, allowing mobile electronics designers to implement a touch pad, scroll wheel, slider, or up to 36 buttons per device, making it easier to browse through large files of music, pictures and video. The AD7147 provides highly accurate measurement and responsiveness, and features the addition of an active shield feature for improved noise performance.

AD7150... Ultra Low Power, 2-Channel, Capacitance Converter for Proximity Sensing

The AD7150 is an ultra low power device specifically designed for highly sensitive proximity sensing applications. It provides a complete signal processing solution for proximity sensors offering important features such as electromagnetic compatibility (EMC), adaptive environmental calibration, small package, low power consumption and fast response time. The AD7150 consumes just 90µA, resulting in a 70% power saving relative to existing optical sensor solutions. This makes the AD7150 ideal for use in portable and battery-powered products in automotive, industrial and even consumer applications, such as entry and security systems, remote detection and contact-less switches.

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Part # Description
AD7142 Programmable Capacitance to Digital Converter with Environmental Compensation
AD7143 Programmable Controller for Capacitance Touch Sensors
AD7147 CapTouch® Programmable Controller for Single Electrode Capacitance Sensors
AD7150 Ultra-Low Power, 2 Channel, Capacitance Converter for Proximity Sensing
AD7151 Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing
AD7745 24-bit, 1 Channel Capacitance to Digital Converter
AD7746 24-bit, 2 Channel Capacitance to Digital Converter
AD7747 24-Bit Capacitance to Digital Converter

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Advertorials ...

Boost Precision and Accuracy with Single Chip Capacitance- and Impedance-to-Digital Converters (pdf)

Providing an Edge in Capacitive Sensor Applications (pdf)

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Application Notes

AN-283: Sigma-Delta ADCs and DACs (pdf)
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)
When to Use/How to Use Sigma-Delta ADCs; Part 1.

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

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

AN-830: Factors Affecting Sensor Response (pdf)
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)
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.

AN-854: Sensor PCB Design Guidelines for the AD7142 and AD7143 Capacitance-to-Digital Converters (pdf)
The AD7142 and AD7143 are integrated capacitance-to-digital converters (CDC) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7143 can interface to external capacitance sensors implementing functions such as capacitive buttons, sliders, or scroll wheels.

AN-856: AD7142 Applications Using Sensor Buttons (pdf)
This application note describes the host processor requirements to support sensor button interfaces.

AN-857: Introduction to AD7142 Host Software Requirements (pdf)
This document describes the AD7142 host processor software requirements to support the capacitance sensor interfaces listed in Table 1 of the application note.

AN-858: AD7142 Sensor Board In-Line Production Test Procedure (pdf)
This application note describes the in-line testing procedure for the AD7142 sensor board.

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Press Releases

Capacitance-To-Digital Converter From Analog Devices Enables Greater Touch-Control Sensitivity In Portable Electronic Devices , 6/11/2007
AD7147 CapTouch® controller provides accurate measurement and improved responsiveness for user interface controls.


Analog Devices Optimizes Sensing Technology For Automotive And Industrial Applications , 11/14/2006
New capacitance-to-digital converter (CDC) and iSensor™ motion sensing devices make it easier for system designers to reap the benefits of integrated sensing technologies.

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Product Reviews

AD7147: Higher Touch-Control Sensitivity From Capacitance-to-Digital Converter
(acquisitionZONE, 7/30/2007)


CDC Enables Touch-Control Sensitivity in Portable Electronic Devices
(Embedded.com, 6/11/2007)

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Part # Res (Bits) T-Put Rate # of Capac-itance Inputs Supply V Pwr Diss (max) Interface Input Base Capac-itance (max) Input Capac-itance Range Pkg Type Product Description
AD7142 16 30 SPS 14 Single(+3)
Single(+3.3)		 3.6 mW SPI 20 pF ±2 pF 32-lead LFCSP CapTouch® Programmable Controller for 2-Electrode Capacitance Sensors with SPI Interface
AD7143 16 40 SPS 8 Single(+3)
Single(+3.3)		 3.6mW I2C 20 pF ±2 pF 16-lead LFCSP CapTouch® Programmable 8 input Controller for 2-Electrode Capacitance Sensors with I2C interface
AD7147 16 40 SPS 13 Single(+3)
Single(+3.3)		 3.6mW SPI 20 pF ±8 pF 24-lead LFCSP CapTouch® Programmable Controller for Single Electrode Capacitance Sensors with SPI interface
AD7150 12 100 SPS 2 Single(+3),
Single(+3.3)		 0.3 mW I2C 10 pF 4 pF 10-lead MSOP Ultra-Low Power, 2 Channel Capacitance to Digital Converter with Adaptive Environmental Compensation for Proximity Sensing Applications
AD7151 12 100 SPS 1 Single(+3),
Single(+3.3)		 0.2 mW I2C 10 pF 4 pF 10-lead MSOP Ultra-Low Power, 1 Channel Capacitance to Digital Converter with Adaptive Environmental Compensation for Proximity Sensing Applications
AD7745 24 90 SPS 1 Single(+3),
Single(+3.3),
Single(+5)		 3.5 mW I2C 17 pF ±4 pF 16-lead TSSOP 24-bit Capacitance-to-Digital Converter with 1 differential or single-ended capacitance input channel for interfacing to a dual-electrode capacitive sensor
AD7746 24 90 SPS 2 Single(+3),
Single(+3.3),
Single(+5)		 3.5 mW I2C 17 pF ±4 pF 16-lead TSSOP 24-bit Capacitance-to-Digital Converter with 2 differential or single-ended capacitance input channels for interfacing to a dual-electrode capacitive sensor
AD7747 24 90 SPS 1 Single(+3),
Single(+3.3),
Single(+5)		 3.5 mW I2C 17 pF ±4 pF 16-lead TSSOP 24-bit Capacitance-to-Digital Converter with 1 differential or single-ended capacitance input channel for interfacing to a single-electrode capacitive sensor

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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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