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ADS7843-Q1 Datasheet Preview

ADS7843-Q1 Datasheet

TOUCH SCREEN CONTROLLER

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ADS7843-Q1
www.ti.com
SBAS504A – MARCH 2011 – REVISED JULY 2012
TOUCH SCREEN CONTROLLER
Check for Samples: ADS7843-Q1
FEATURES
1
• 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
APPLICATIONS
• Personal Digital Assistants
• Portable Instruments
• Point-of-Sales Terminals
• Pagers
• Touch Screen Monitors
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 (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 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.
TA
–40°C to 85°C
ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART NUMBER
SSOP-16 – DBQ
Tape and reel
ADS7843IDBQRQ1
TOP-SIDE MARKING
S7843Q
(1) 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 www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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




etcTI

ADS7843-Q1 Datasheet Preview

ADS7843-Q1 Datasheet

TOUCH SCREEN CONTROLLER

No Preview Available !

ADS7843-Q1
SBAS504A – MARCH 2011 – REVISED JULY 2012
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PIN DESCRIPTIONS (continued)
SSOP PACKAGE
(TOP VIEW)
PIN DESCRIPTIONS
PIN
DESCRIPTION
NO. NAME
1 +VCC Power Supply, 2.7V to 5V.
2
X+ X+ Position Input. ADC input Channel 1.
3
Y+ Y+ Position Input. ADC input Channel 2.
4
X– X– Position Input
PIN
DESCRIPTION
NO. NAME
5
Y– Y– Position Input
6 GND Ground
7
IN3 Auxiliary Input 1. ADC input Channel 3.
8
IN4 Auxiliary Input 2. ADC input Channel 4.
9 VREF Voltage Reference Input
10 +VCC Power Supply, 2.7V to 5V.
11
PENIR Pen Interrupt. Open anode output (requires
Q 10kΩ to 100kΩ pull-up resistor externally).
1Serial Data Output. Data is shifted on the
12 DOUT falling edge of DCLK. This output is high
impedance when CS is HIGH.
13
BUSY
Busy Output. This output is high impedance
when CS is HIGH.
14
DIN
Serial Data Input. If CS is LOW, data is latched
on rising edge of DCLK.
15
CS
Chip Select Input. Controls conversion timing
and enables the serial input/output register.
External Clock Input. This clock runs the SAR
16 DCLK conversion process and synchronizes serial
data I/O.
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
PARAMETER
+VCC to GND
+VCC to GND
Analog inputs to GND
Digital inputs to GND
Power dissipation
Maximum junction temperature
Operating temperature range
Storage temperature range
Lead temperature (soldering, 10s)
Electrostatic discharge
(ESD)
Human-Body Model (HBM)
Machine Model (MM)
Charged-Device Model (CDM)
VALUE
–0.3 V to 6.5 V
–0.3 to +6
–0.3 to +VCC + 0.3
–0.3 to +VCC + 0.3
250
+150
–40°C to +85
–65°C to +150
+300
400
100
750
UNIT
V
V
V
mW
°C
°C
°C
°C
V
V
V
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
2
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Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): ADS7843-Q1



Part Number ADS7843-Q1
Description TOUCH SCREEN CONTROLLER
Maker etcTI
Total Page 3 Pages
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