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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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|AD7142||Programmable Capacitance to Digital Converter with Environmental Compensation||Order Samples|
|AD7143||Programmable Controller for Capacitance Touch Sensors||Order Samples|
|AD7150||Ultra Low Power, 2 Channel, Capacitance Converter for Proximity Sensing||Order Samples|
|AD7745||24-bit, 1 Channel Capacitance to Digital Converter||Order Samples|
|AD7746||24-bit, 2 Channel Capacitance to Digital Converter||Order Samples|
|AD7747||24-Bit Capacitance to Digital Converter||Order Samples|
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.
|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||Price* (1000-4999)|
|3.6 mW||SPI||20 pF||±2 pF||32-lead LFCSP||16-bit Programmable Capacitance-to-Digital Converter with environmental compensation and SPI interface||$1.35|
|3.6 mW||I2C||20 pF||±2 pF||32-lead LFCSP||16-bit Programmable Capacitance-to-Digital Converter with environmental compensation and I2C interface||$1.35|
|3.6 mW||I2C||20 pF||±2 pF||16-lead LFCSP||CapTouch® Programmable 8 input Controller for 2-Electrode Capacitance Sensors with I2C interface||$1.24|
|0.3 mW||I2C||14 pF||4 pF||10-lead µSOIC||Ultra Low Power, 2 Channel Capacitance to Digital Converter with Adaptive Environmental Compensation for Proximity Sensing Applications||$1.35|
|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||$4.60|
|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||$4.95|
|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||$4.60|
* 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.