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ADS7843

ACTIVE

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

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Data sheet

ADS7843

ACTIVE
Data sheet Order now

Product details

SAR ADC resolution (Bits) 12 Touch panel 4-Wire Control interface SPI Vref (int/ext) Int Rating Catalog Operating temperature range (C) -40 to 85 Input type Single-Ended
SAR ADC resolution (Bits) 12 Touch panel 4-Wire Control interface SPI Vref (int/ext) Int Rating Catalog Operating temperature range (C) -40 to 85 Input type Single-Ended
SSOP (DBQ) 16 29 mm² 4.9 x 6
  • 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
  • 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

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.

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

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