SBAS504A – MARCH 2011 – REVISED JULY 2012
TOUCH SCREEN CONTROLLER
Check for Samples:
1
FEATURES
Qualified for Automotive Applications
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
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DESCRIPTION
The ADS7843-Q1 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 (V
REF
) can be varied between 1V
and +V
CC
, providing a corresponding input voltage
range of 0V to V
REF
. The device includes a shutdown
mode which reduces typical power dissipation to
under 0.5µW. The ADS7843-Q1 is specified down to
2.7V operation.
Low power, high speed, and onboard switches make
the ADS7843-Q1 ideal for battery-operated systems
such as personal digital assistants with resistive
touch screens and other portable equipment. The
ADS7843-Q1 is available in an SSOP-16 package
and is specified over the –40°C to +85°C temperature
range.
APPLICATIONS
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Personal Digital Assistants
Portable Instruments
Point-of-Sales Terminals
Pagers
Touch Screen Monitors
ORDERING INFORMATION
(1)
T
A
–40°C to 85°C
(1)
(2)
PACKAGE
(2)
SSOP-16 – DBQ
Tape and reel
ORDERABLE PART NUMBER
ADS7843IDBQRQ1
TOP-SIDE MARKING
S7843Q
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at
Package drawings, thermal data, and symbolization are available at
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2012, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
