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AD5243 Datasheet

  • AD5243

  • Dual 256-Position I2C Compatible Digital Potentiometer

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  • 22页

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Dual 256-Position I
2
C Compatible
Digital Potentiometer
AD5243/AD5248
FEATURES
2-channel, 256-position
End-to-end resistance: 2.5 k鈩? 10 k鈩? 50 k鈩? and 100 k鈩?/div>
Compact MSOP-10 (3 mm 脳 4.9 mm) package
Fast settling time: t
S
= 5 碌s typ on power-up
Full read/write of wiper register
Power-on preset to midscale
Extra package address decode pins AD0 and AD1 (AD5248
only)
Computer software replaces 碌C in factory programming
applications
Single supply: 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/掳C
Low power: I
DD
= 6 碌A max
Wide operating temperature: 鈭?0掳C to +125掳C
Evaluation board available
FUNCTIONAL BLOCK DIAGRAMS
A1
W1
B1
A2
W2
B2
V
DD
WIPER
REGISTER 1
GND
WIPER
REGISTER 2
AD5243
SDA
SCL
PC INTERFACE
04109-0-001
Figure 1. AD5243
W1
B1
W2
B2
APPLICATIONS
Systems calibrations
Electronics level settings
Mechanical Trimmers庐 replacement in new designs
Permanent factory PCB setting
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
V
DD
RDAC
REGISTER 1
GND
RDAC
REGISTER 2
AD0
AD1
SDA
SCL
ADDRESS
DECODE
/
8
SERIAL INPUT
REGISTER
AD5248
04109-0-002
Figure 2. AD5248
GENERAL DESCRIPTION
The AD5243 and AD5248 provide a compact 3 mm 脳 4.9 mm
packaged solution for dual 256-position adjustment applica-
tions. These devices perform the same electronic adjustment
function as a 3-terminal mechanical potentiometer (AD5243)
or a 2-terminal variable resistor (AD5248). Available in four
different end-to-end resistance values (2.5 k鈩? 10 k鈩? 50 k鈩?
and 100 k鈩?, these low temperature coefficient devices are ideal
for high accuracy and stability variable resistance adjustments.
The wiper settings are controllable through the I
2
C compatible
digital interface. The AD5248 has extra package address decode
pins AD0 and AD1, allowing multiple parts to share the same
I
2
C 2-wire bus on a PCB. The resistance between the wiper and
either endpoint of the fixed resistor varies linearly with respect
to the digital code transferred into the RDAC latch.
1
Operating from a 2.7 V to 5.5 V power supply and consuming
less than 6 碌A allows for usage in portable battery-operated
applications.
For applications that program the AD5243/AD5258 at the
factory, Analog Devices offers device programming software
running on Windows庐 NT/2000/XP operating systems. This
software effectively replaces any external I
2
C controllers, which
in turn enhances users鈥?systems time-to-market. An AD5243/
AD5248 evaluation kit and software are available. The kit
includes a cable and instruction manual.
1
The terms
digital potentiometer, VR,
and
RDAC
are used interchangeably.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
漏 2004 Analog Devices, Inc. All rights reserved.

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