ADS7843

ACTIVE

12-bit Analog-to-Digital Converter (ADC) with a synchronous serial interface and touch screen con

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Product details

Parameters

SAR ADC resolution (Bits) 12 Touch panel 4-Wire Control interface SPI Vref (int/ext) Int Rating Automotive, Catalog Operating temperature range (C) -40 to 85 Input type Single-Ended open-in-new Find other Touch screen controllers

Package | Pins | Size

SSOP (DBQ) 16 29 mm² 4.9 x 6 open-in-new Find other Touch screen controllers

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

US Patent No. 6246394

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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 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.

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Technical documentation

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Type Title Date
* Data sheet ADS7843: Touch Screen Controller datasheet (Rev. B) Mar. 26, 2002
Application note PCB Layout Guideline for TI Resistive TSC Devices Oct. 04, 2012
Application note Using a touch-screen controller’s auxiliary inputs Oct. 12, 2007
Application note Reducing Analog Input Noise in Touch Screen Systems (Rev. A) Sep. 15, 2007
Application note Calibration in touch-screen systems Aug. 10, 2007
Application note Operation Schemes of Touch Screen Controllers May 21, 2007
Application note Apply TI TSC for Various and Multiple Functions Dec. 11, 2006
Application note How to Use TI's 4-Wire TSC to Control an 8-Wire Resistive Touch Screen Mar. 27, 2006
User guide DEM-CIB Evaluation Fixture Computer Interface Board Feb. 13, 2001
Application note ADS7843 Pen Interrupt Sep. 27, 2000
User guide DEM-ADS7843E: Demonstration Fixture for the ADS7843 Sep. 27, 2000
Application note Touch Screen Controller Tips Sep. 27, 2000

Design & development

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SSOP (DBQ) 16 View options

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