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Part: AD7142ACPZ-500RL7
Category:
Data Conversion
Description: Programmable Capacitance-to-Digital Converter with Environmental Compensation<<<>>>AD7142 and AD7142-1 are integrated capacitance-to-digital converters (CDCs) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7142-1 can interface to external capacitance sensors implementing functions such as capacitive buttons, scroll bars, or joypads. <<<>>><<<>>>The CDC has 14 inputs, channeled through a switch matrix to a 16-bit, 240 kHz sigma-delta (¥Ò-¥Ä) capacitance-to-digital converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. The external sensors can be arranged as a series of buttons, as a scroll bar or wheel, or as a combination of sensor types. By programming the registers, the user has full control over the CDC setup. High resolution scroll bar sensors require software to run on the host processor. <<<>>><<<>>>The AD7142 and AD7142-1 have on-chip calibration logic to account for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals, while the sensors are not touched. This ensures that there are no false or non-registering touches on the external sensors due to a changing environment. <<<>>><<<>>>The AD7142 has an SPI-compatible serial interface, and the AD7142-1 has an I2C-compatible serial interface. Both versions of AD7142 have an interrupt output, as well as a general-purpose input output (GPIO). <<<>>><<<>>>The AD7142 and AD7142-1 are available in a 32-lead, 5 mm ¡¿ 5 mm LFCSP package and operate from a 2.7 V to 3.3 V supply. The operating current consumption is less than 1 mA, falling to 50 ¥ìA in low power mode (conversion interval of 400 ms). <<<>>><<<>>>Applications<<<>>><<<>>><<<>>>Personal music and multimedia players <<<>>>Cell phones <<<>>>Digital still cameras <<<>>>Smart hand-held devices <<<>>>Television, A/V and remote controls <<<>>>Gaming consoles <<<>>><<<>>>Specifications <<<>>>Res (Bits) 16bit <<<>>>Thruput Rate 30SPS <<<>>># of ADC Inputs 14 <<<>>>Supply V Single(+2.7 to +3.3) <<<>>>Pwr Diss (max) - <<<>>>Interface I©÷C/Ser 2-Wire, Ser <<<>>>Ain Range ¡¾ 2 pF (Delta C) <<<>>>SNR (dB) n/a <<<>>>Pkg Type CSP
Company: Analog Devices
Datasheet: Download AD7142ACPZ-500RL7 datasheet File size : 1235 kB
Request For quote: Find where to buy AD7142ACPZ-500RL7
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