Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD7147
Edited by the Electronicstalk Editorial
Team on 12 June 2007
Convertor creates capacitive controls
Capacitance-to-digital convertor allows designers to quickly and easily add responsive user controls, such as scroll wheels and touch pads, to portable electronic devices.
Cellphones, multimedia players, digital cameras and other rapidly shrinking mobile devices increasingly require new user interfaces to replace mechanical switches Analog Devices' new capacitance-to-digital convertor (CDC) is a highly integrated touch controller that allows designers to quickly and easily add responsive user controls, such as scroll wheels and touch pads, to portable electronic devices
This article was originally published on Electronicstalk on 14 Sep 2001 at 8.00am (UK)
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As the newest addition to Analog Devices' family of CapTouch controllers for consumer applications, the AD7147 provides highly accurate measurement and responsiveness, and features the addition of an active shield feature for improved noise performance.
Requiring only a single PCB (printed-circuit board) for full implementation, the new CDC is ideal for ultrathin mobile electronic devices.
The configurable AD7147 CDC features 13 capacitance inputs and femtofarad resolution, allowing mobile electronics designers to implement a touch pad, scroll wheel, slider or up to 36 buttons per device.
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The addition of integrated active shield technology protects the AD7147 from capacitance-to-ground pickup and other noise sources in the system, allowing designers the freedom to place the sensor away from the main system IC.
The analogue front-end of the AD7147 has been improved, yielding a threefold improvement in sensor response compared with previous AD714x products.
The improved response allows end-users to experience more accurate finger navigation and improved device performance, while continuing to offer designers per-channel sensitivity adjustment for sensor-response fine tuning.
The AD7147 includes on-chip sensitivity algorithms that compensate for changes in temperature and humidity, and ensure that users with different finger sizes receive the same responsive sensor performance.
The AD7147 typically consumes 1mA in full power mode, and just 50uA in low-power mode, a 20% reduction compared with competitive products on the market.
Additionally, the AD7147 has the industry's lowest shutdown power consumption at only 2uA.
The AD7147 includes an SPI-compatible serial interface, whereas the AD7147-1 features an I2C-compatible serial interface.
Both devices are sampling now and will be available in full production quantities in July 2007.
Priced at US $1.30 per unit in 1000-unit quantities, both products are housed in 24-pin 4 x 4mm lead-frame chip-scale packages.
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