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AD5245BRJ50-RL7 Datasheet

  • AD5245BRJ50-RL7

  • 256-Position I2C Compatible Digital Potentiometer

  • 16頁

  • AD

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256-Position I
2
C Compatible
Digital Potentiometer
AD5245
FEATURES
256-position
End-to-end resistance 5 k鈩? 10 k鈩? 50 k鈩? 100 k鈩?/div>
Compact SOT-23-8 (2.9 mm 脳 3 mm) package
I
2
C廬 compatible interface
Extra package address decode pin AD0
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/擄C
Low power, I
DD
= 8 碌A(chǔ)
Wide operating temperature 鈥?0擄C to +125擄C
Evaluation board available
FUNCTIONAL BLOCK DIAGRAM
V
DD
A
SCL
SDA
AD0
W
I
2
C INTERFACE
WIPER
REGISTER
B
GND
Figure 1.
APPLICATIONS
Mechanical potentiometer replacement in new designs
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
PIN CONFIGURATION
W 1
V
DD
2
GND 3
AD5245
8 A
7 B
6 AD0
TOP VIEW
SCL 4 (Not to Scale) 5 SDA
Figure 2.
GENERAL OVERVIEW
The AD5245 provides a compact 2.9 mm 脳 3 mm packaged
solution for 256-position adjustment applications. These devices
perform the same electronic adjustment function as mechanical
potentiometers or variable resistors, with enhanced resolution,
solid-state reliability, and superior low temperature coefficient
performance.
The wiper settings are controllable through an I
2
C compatible
digital interface, which can also be used to read back the wiper
register content. AD0 can be used to place up to two devices on
the same bus. Command bits are available to reset the wiper
position to midscale or to shut down the device into a state of
zero power consumption.
Operating from a 2.7 V to 5.5 V power supply and consuming
less than 5 碌A(chǔ) allows for usage in portable battery-operated
applications.
Note:
The terms
digital potentiometer, VR,
and
RDAC
are used interchangeably.
Purchase of licensed I
2
C components of Analog Devices or one of its sublicensed
Associated Companies conveys a license for the purchaser under the Philips I
2
C
Patent Rights to use these components in an I
2
C system, provided that the system
conforms to the I
2
C Standard Specification as defined by Philips.
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 companies.
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 2003 Analog Devices, Inc. All rights reserved.

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