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AD5247BKS50-RL7 데이터시트(PDF) 1 Page - Analog Devices

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상세설명  128-Position I2C Compatible Digital Potentiometer
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
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128-Position I2C Compatible
Digital Potentiometer
AD5247
FEATURES
128-position
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Ultracompact SC70-6 (2 mm × 2.1 mm) package
I2C
® compatible interface
Full read/write of wiper register
Power-on preset to midscale
Single supply 2.7 V to 5.5 V
Low temperature coefficient 45 ppm/°C
Low power, IDD = 3 µA typical
Wide operating temperature –40°C to +125°C
Evaluation board available
APPLICATIONS
Mechanical potentiometer replacement in new designs
Rev. 0
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
LCD brightness and contrast adjustment
Automotive electronics adjustment
Gain control and offset adjustment
GENERAL OVERVIEW
The AD5247 provides a compact 2 mm × 2.1 mm packaged
solution for 128-position adjustment applications. This device
performs the same electronic adjustment function as a
mechanical potentiometer or a variable resistor. Available in
four different end-to-end resistance values (5 kΩ, 10 kΩ, 50 kΩ,
100 kΩ), these low temperature coefficient devices are ideal for
high accuracy and stability variable resistance adjustments.
The wiper settings are controllable through the I2C compatible
digital interface, which can also be used to read back the present
wiper register control word. The resistance between the wiper
and either end point of the fixed resistor varies linearly with
respect to the digital code transferred into the RDAC1 latch.
Operating from a 2.7 V to 5.5 V power supply and consuming
3 µA allows for usage in portable battery-operated applications.
FUNCTIONAL BLOCK DIAGRAM
I2C INTERFACE
WIPER
REGISTER
SCL
SDA
GND
VDD
A
W
B
Figure 1.
1 Note: The terms digital potentiometer, VR, and RDAC are used
interchangeably in this document.
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
© 2003 Analog Devices, Inc. All rights reserved.


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