ای سی تاچ اسکرین مقاومتی (صفحه لمسی) با مبدل ولتاژ 12 بیتی داخلی و رفرش 125 کیلو هرتز با قابلیت تنظیم حساسیت توسط پایه VREF بین 1 تا 5 ولت TOUCH SCREEN CONTROLLER
DESCRIPTION
The ADS7843 is a 12-bit sampling analog-to-digital converter (ADC) with a synchronous serial interface and low on-resistance switches for driving touch screens. Typical power dissipation is 750µW at a 125kHz throughput rate and a +2.7V supply. The reference voltage (VREF) can be varied between 1V and +VCC, providing a corresponding input voltage range of 0V to VREF. The device includes a shutdown mode which reduces typical power dissipation to under 0.5µW. The ADS7843 is guaranteed down to 2.7V operation
Low power, high speed, and on-board switches make the ADS7843 ideal for battery operated systems such as personal digital assistants with resistive touch screens and other portable equipment. The ADS7843 is available in a 16-lead SSOP package and is guaranteed over the –40°C to +85°C temperature range
FEATURES
4-WIRE TOUCH SCREEN INTERFACE
RATIOMETRIC CONVERSION
SINGLE SUPPLY: 2.7V to 5V
UP TO 125kHz CONVERSION RATE
SERIAL INTERFACE
PROGRAMMABLE 8- OR 12-BIT RESOLUTION
2 AUXILIARY ANALOG INPUTS
FULL POWER-DOWN CONTROL
APPLICATIONS
PERSONAL DIGITAL ASSISTANTS
PORTABLE INSTRUMENTS
POINT-OF-SALES TERMINALS
PAGERS
TOUCH-SCREEN MONITORS
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