ADS7845E 12-Bit Touch Screen Controller 125kHz Sampling SPI Interface 2.7-5V SSOP-16 -40°C to +85°C

ADS7845E

FEATURES

 5-WIRE TOUCH SCREEN INTERFACE

 RATIOMETRIC CONVERSION

 SINGLE SUPPLY: 2V to 5V

 UP TO 125kHz CONVERSION RATE

 SERIAL INTERFACE

 PROGRAMMABLE 8- OR 12-BIT RESOLUTION

 AUXILIARY ANALOG INPUTS

 FULL POWER-DOWN CONTROL

APPLICATIONS

 PERSONAL DIGITAL ASSISTANTS

 PORTABLE INSTRUMENTS

 POINT-OF-SALES TERMINALS

 PAGERS

 TOUCH-SCREEN MONITORS

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 avail able in a 16-lead SSOP package and is guaranteed over the –40°C to +85°C temperature range.

INFORMATION

Drawing

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