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Analog Devices Semiconductor Electronic Components Datasheet

AD5248 Datasheet

Dual 256-Position I2C Compatible Digital Potentiometer

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AD5248 pdf
Data Sheet
Dual, 256-Position, I2C-Compatible
Digital Potentiometers
AD5243/AD5248
FEATURES
2-channel, 256-position potentiometers
End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ
Compact 10-lead MSOP (3 mm × 4.9 mm) package
Fast settling time: tS = 5 µs typical 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 microcontroller in factory
programming applications
Single supply: 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/°C
Low power: IDD = 6 µA maximum
Wide operating temperature: −40°C to +125°C
Evaluation board available
APPLICATIONS
Systems calibrations
Electronics level settings
Mechanical trimmers 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
GENERAL DESCRIPTION
The AD5243 and AD5248 provide a compact 3 mm × 4.9 mm
packaged solution for dual, 256-position adjustment applications.
The AD5243 performs the same electronic adjustment function as
a 3-terminal mechanical potentiometer, and the AD5248 performs
the same adjustment function as a 2-terminal variable resistor.
Available in four end-to-end resistance values (2.5 kΩ, 10 kΩ,
50 kΩ, and 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. The AD5248 has extra package
address decode pins, AD0 and AD1, allowing multiple parts to
share the same I2C, 2-wire bus on a PCB. The resistance between
FUNCTIONAL BLOCK DIAGRAMS
A1 W1 B1
A2 W2 B2
VDD
GND
SDA
SCL
WIPER
REGISTER 1
WIPER
REGISTER 2
AD5243
PC INTERFACE
Figure 1. AD5243
W1 B1
W2
B2
VDD
GND
AD0
AD1
SDA
SCL
RDAC
REGISTER 1
RDAC
REGISTER 2
ADDRESS
/DECODE
8
AD5248
SERIAL INPUT
REGISTER
Figure 2. AD5248
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 µA allows the AD5243/AD5248 to be used in portable
battery-operated applications.
For applications that program the AD5243/AD5258 at the factory,
Analog Devices, Inc., offers device programming software running
on Windows® NT/2000/XP operating systems. This software
effectively replaces the need for external I2C controllers, which
in turn enhances the time to market of systems. 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. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2004–2012 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5248 Datasheet

Dual 256-Position I2C Compatible Digital Potentiometer

No Preview Available !

AD5248 pdf
AD5243/AD5248
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Functional Block Diagrams............................................................. 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Electrical Characteristics: 2.5 kΩ Version................................. 3 
Electrical Characteristics: 10 kΩ, 50 kΩ, and 100 kΩ
Versions.......................................................................................... 4 
Timing Characteristics: All Versions ......................................... 5 
Absolute Maximum Ratings............................................................ 6 
ESD Caution.................................................................................. 6 
Pin Configurations and Function Descriptions ........................... 7 
Typical Performance Characteristics ............................................. 8 
REVISION HISTORY
4/12—Rev. A to Rev. B
Changes to Rheostat Operation Section, Table 7, and
Table 8 ...............................................................................................13
Changes to Voltage Output Operation Section ...........................14
Deleted Evaluation Board Section and Figure 45, Renumbered
Sequentially ......................................................................................15
Changes to Table 13.........................................................................17
Updated Outline Dimensions ........................................................19
Changes to Ordering Guide ...........................................................19
Data Sheet
Test Circuits..................................................................................... 12 
Theory of Operation ...................................................................... 13 
Programming the Variable Resistor and Voltage ................... 13 
Programming the Potentiometer Divider............................... 14 
ESD Protection ........................................................................... 14 
Terminal Voltage Operating Range ......................................... 14 
Power-Up Sequence ................................................................... 14 
Layout and Power Supply Bypassing ....................................... 14 
Constant Bias to Retain Resistance Setting............................. 15 
I2C Interface .................................................................................... 16 
I2C Compatible, 2-Wire Serial Bus .......................................... 16 
I2C Controller Programming.................................................... 18 
Outline Dimensions ....................................................................... 19 
Ordering Guide .......................................................................... 19 
4/09—Rev. 0 to Rev. A
Changes to DC Characteristics—Rheostat Mode Parameter and
to DC Characteristics—Potentiometer Divider Mode Parameter,
Table 1 .................................................................................................3
Moved Figure 3 ..................................................................................5
Updated Outline Dimensions........................................................19
Changes to Ordering Guide ...........................................................19
1/04—Revision 0: Initial Version
Rev. B | Page 2 of 20


Part Number AD5248
Description Dual 256-Position I2C Compatible Digital Potentiometer
Maker Analog Devices
Total Page 20 Pages
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