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 750uW 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 0.5uW. The ADS7843 is specified down to 2.7V operation.
●Low power, high speed, and onboard 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 an SSOP-16 package and is specified over the 40°C to +85°C temperature range.
● 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
●US Patent No. 6246394
