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AD7151:  Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing

Product Details


The AD7151 delivers a complete signal processing solution for capacitive proximity sensors, featuring an ultra-low power converter with fast response time. The AD7150 is a two-channel alternative to the AD7151.

The AD7151 uses Analog Devices, Inc., capacitance-to-digital converter (CDC) technology, which combines features important for interfacing to real sensors, such as high input sensitivity and high tolerance of both input parasitic ground capacitance and leakage current.

The integrated adaptive threshold algorithm compensates for any variations in the sensor capacitance due to environmental factors like humidity and temperature or due to changes in the dielectric material over time.

By default, the AD7151 operates in standalone mode using the fixed power-up settings and indicates detection on a digital output. Alternatively, the AD7151 can be interfaced to a microcontroller via the serial interface, the internal registers can be programmed with user-defined settings, and the data and status can be read from the part.

The AD7151 operates with a 2.7 V to 3.6 V power supply. It is specified over the temperature range −40°C to +85°C.

Applications

  • Proximity sensing
  • Contactless switching
  • Position detection
  • Level detection

FEATURES and BENEFITS

  • Ultra-low power
    2.7 V to 3.6 V, 70 µA
  • Response time: 10 ms
  • Adaptive environmental compensation
  • 1 capacitance input channel
    Sensor capacitance (CSENS) 0 up to 13 pF
    Sensitivity to 1 fF
  • EMC tested
  • 2 modes of operation
    Standalone with fixed settings
    Interfaced to a microcontroller for user-defined settings
  • Proximity detection output flag
  • 2-wire serial interface (I2C-compatible)
  • Operating temperature
    −40°C to +85°C
  • 10-lead MSOP package

Functional Block Diagram for AD7151

Documentation

Title Content Type File Type
AD7151: Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing Data Sheet (Rev 0, 11/2007) (pdf, 1015 kB) Data Sheets PDF
AN-1048: AD7150 On-Chip Noise Filter  (pdf, 92 kB) Application Notes PDF
Webcast: Design And Develop Innovative And Robust Touch Sensor Interfaces Using Capacitive-To-Digital Converters
This Webcast will focus on the design and development of CDC-based touch sensors and their application, cite CDC product examples such as the AD7142, and explore development tools provided by ADI.
Webcasts WEBCAST
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
2008 Medical Solution Profile  (pdf, 126 kB)
High Performance ICs for Medical Imaging, Patient Monitoring, and Instrumentation
Overview PDF
AD7150 Capacitance Converter for Proximity Sensing  (pdf, 1907 kB) Overview PDF
What are Capacitive Sensors and how are they used? FAQs/RAQs HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7150 IIO Capacitance to Digital Converter Linux Driver Device Drivers HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD7151 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7151BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $1.62 $1.37 Y  Material Info PCN Purchase Sample
AD7151BRMZ-REEL Status: Production 10 ld MSOP 10 Ind Reel, 3000 - $1.37 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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