Capacitance-to-Digital Converter (CDC) Technology
... Enables High Accuracy Capacitance Sensing for Industrial, Medical, Automotive, and Consumer Applications
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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Application Notes
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.
AN-854: Sensor PCB Design Guidelines for the
AD7142 and AD7143 Capacitance-to-Digital Converters (pdf, 596,423 bytes)
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, 125,149 bytes)
This application note describes the host processor requirements to support sensor button interfaces.
AN-857: Introduction to AD7142 Host Software Requirements (pdf, 78,627 bytes)
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, 127,484 bytes)
This application note describes the in-line testing procedure for the AD7142 sensor board.
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Product Reviews
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| 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 |
| AD7142-1 |
16 |
30 SPS |
14 |
Single(+3)
Single(+3.3) |
3.6 mW |
I2C |
20 pF |
±2 pF |
32-lead LFCSP |
CapTouch® Programmable Controller for 2-Electrode Capacitance Sensors with I2C 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 |
| AD7147-1 |
16 |
40 SPS |
13 |
Single(+3)
Single(+3.3) |
3.6mW |
I2C |
20 pF |
±8 pF |
24-lead LFCSP |
CapTouch® Programmable Controller for Single Electrode Capacitance Sensors with I2C 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.
