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Burr-Brown Corporation

ADS7843 Datasheet Preview

ADS7843 Datasheet

TOUCH SCREEN CONTROLLER

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® ADS7843
TOUCH SCREEN CONTROLLER
FEATURES
q 4-WIRE TOUCH SCREEN INTERFACE
q RATIOMETRIC CONVERSION
q SINGLE SUPPLY: 2.7V to 5V
q UP TO 125kHz CONVERSION RATE
q SERIAL INTERFACE
q PROGRAMMABLE 8- OR 12-BIT RESOLUTION
q 2 AUXILIARY ANALOG INPUTS
q FULL POWER-DOWN CONTROL
APPLICATIONS
q PERSONAL DIGITAL ASSISTANTS
q PORTABLE INSTRUMENTS
q POINT-OF-SALES TERMINALS
q PAGERS
q TOUCH-SCREEN MONITORS
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 750µW at a
125kHz throughput rate and a +2.7V supply. The
reference voltage (V ) can be varied between 1V and
REF
+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 is guaranteed down to 2.7V
operation.
Low power, high speed, and on-board 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 avail-
able in a 16-lead SSOP package and is guaranteed
over the –40°C to +85°C temperature range.
PENIRQ
+VCC
X+
X–
Y+
Y–
IN3
IN4
VREF
Four
Channel
Multiplexer
SAR
CDAC
Comparator
Serial
Interface
and
Control
DCLK
CS
DIN
DOUT
BUSY
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1997 Burr-Brown Corporation
PDS-1441C
Printed in U.S.A. June, 1998




Burr-Brown Corporation

ADS7843 Datasheet Preview

ADS7843 Datasheet

TOUCH SCREEN CONTROLLER

No Preview Available !

SPECIFICATIONS
At TA =–40°C to +85°C, +VCC = +2.7V, VREF = +2.5V, fSAMPLE = 125kHz, fCLK = 16 • fSAMPLE = 2MHz, 12-bit mode, and digital inputs = GND or +VCC, unless
otherwise noted.
PARAMETER
ANALOG INPUT
Full-Scale Input Span
Absolute Input Range
Capacitance
Leakage Current
SYSTEM PERFORMANCE
Resolution
No Missing Codes
Integral Linearity Error
Offset Error
Offset Error Match
Gain Error
Gain Error Match
Noise
Power Supply Rejection
SAMPLING DYNAMICS
Conversion Time
Acquisition Time
Throughput Rate
Multiplexer Settling Time
Aperture Delay
Aperture Jitter
Channel-to-Channel Isolation
SWITCH DRIVERS
On-Resistance
Y+, X+
Y–, X–
REFERENCE INPUT
Range
Resistance
Input Current
DIGITAL INPUT/OUTPUT
Logic Family
Logic Levels, Except PENIRQ
VIH
VIL
VOH
VOL
PENIRQ
VOL
Data Format
POWER SUPPLY REQUIREMENTS
+VCC
Quiescent Current
Power Dissipation
TEMPERATURE RANGE
Specified Performance
CONDITIONS
Positive Input - Negative Input
Positive Input
Negative Input
MIN
0
–0.2
–0.2
11
VIN = 2.5Vp-p at 50kHz
3
CS = GND or +VCC
fSAMPLE = 12.5kHz
CS = +VCC
1.0
| IIH | +5µA
| IIL | +5µA
IOH = –250µA
IOL = 250µA
TA = 0°C to +85°C, 100kPull-Up
+VCC • 0.7
–0.3
+VCC • 0.8
Specified Performance
fSAMPLE = 12.5kHz
Shut Down Mode with
DCLK = DIN = +VCC
+VCC = +2.7V
2.7
–40
NOTE: (1) LSB means Least Significant Bit. With VREF equal to +2.5V, one LSB is 610µV.
ADS7843E
TYP
25
0.1
12
0.1
0.1
30
70
500
30
100
100
5
6
5
13
2.5
0.001
CMOS
Straight Binary
280
220
MAX
UNITS
VREF
+VCC +0.2
+0.2
±2
±6
1.0
±4
1.0
12
125
V
V
V
pF
µA
Bits
Bits
LSB(1)
LSB
LSB
LSB
LSB
µVrms
dB
Clk Cycles
Clk Cycles
kHz
ns
ns
ps
dB
+VCC
40
3
V
G
µA
µA
µA
+VCC +0.3
+0.8
0.4
0.8
V
V
V
V
3.6 V
650 µA
µA
3 µA
1.8 mW
+85 °C
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
ADS7843
2


Part Number ADS7843
Description TOUCH SCREEN CONTROLLER
Maker Burr-Brown Corporation
Total Page 12 Pages
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