ADS7843 Texas instruments

ADS7843

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ADS7843

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Описание

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

SAR ADC resolution (Bits)	12
SAR sample rate (max) (ksps)	125
Touch panel	4-Wire
Control interface	SPI
Vref (int/ext)	Internal
Rating	Catalog
Operating temperature range (°C)	-40 to 85
Analog supply (min) (V)	2.7
Analog supply (max) (V)	5.25
Input type	Single-ended