ADS7845

® ADS 784 ADS7845 5 TOUCH SCREEN CONTROLLER FEATURES q 5-WIRE TOUCH SCREEN INTERFACE q RATIOMETRIC CONVERSION q SINGLE SUPPLY: 2V to 5V q UP TO 125kHz CONVERSION RATE q SERIAL INTERFACE q PROGRAMMABLE 8- OR 12-BIT RESOLUTION q AUXILIARY ANALOG INPUTS q FULL POWER-DOWN CONTROL DESCRIPTION The ADS7845 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 ADS7845 is guaranteed down to 2.7V operation. Low power, high speed, and on-board switches make the ADS7845 ideal for battery-operated systems such as personal digital assistants with resistive touch screens and other portable equipment. The ADS7845 is available in a 16-lead SSOP package and is guaranteed over the –40°C to +85°C temperature range. APPLICATIONS q PERSONAL DIGITAL ASSISTANTS q PORTABLE INSTRUMENTS q POINT-OF-SALES TERMINALS q PAGERS q TOUCH-SCREEN MONITORS +VCC GND UR LR GND Driver +VCC UL LL SAR ADS7845 DOUT BUSY Comparator +VCC GND CDAC Serial Data Interface and Control CS AUX IN WIPER PENIRQ MUX DCLK DIN VREF International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 ...