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Analog Devices Semiconductor Electronic Components Datasheet

AD5242 Datasheet

2-Channel/ 256-Position Digital Potentiometer

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AD5242 pdf
I2C-Compatible,
256-Position Digital Potentiometers
AD5241/AD5242
FEATURES
256 positions
10 kΩ, 100 kΩ, 1 MΩ
Low temperature coefficient: 30 ppm/°C
Internal power on midscale preset
Single-supply 2.7 V to 5.5 V or dual-supply ±2.7 V for ac or
bipolar operation
I2C-compatible interface with readback capability
Extra programmable logic outputs
Self-contained shutdown feature
Extended temperature range: −40°C to +105°C
APPLICATIONS
Multimedia, video, and audio
Communications
Mechanical potentiometer replacement
Instrumentation: gain, offset adjustment
Programmable voltage-to-current conversion
Line impedance matching
FUNCTIONAL BLOCK DIAGRAM
A1 W1 B1
O1 O2
SHDN
VDD
RDAC
REGISTER 1
REGISTER 2
VSS
ADDR
DECODE
AD5241
8
SDA
SCL
GND
SERIAL INPUT REGISTER
PWR-ON
RESET
AD0 AD1
Figure 1. AD5241 Functional Block Diagram
A1 W1 B1
A2 W2 B2
O1 O2
SHDN
REGISTER
VDD
RDAC
RDAC
REGISTER 1
REGISTER 2
VSS
SDA
SCL
GND
ADDR
DECODE
1
AD5242
8
SERIAL INPUT REGISTER
PWR-ON
RESET
AD0 AD1
Figure 2. AD5242 Functional Block Diagram
GENERAL DESCRIPTION
The AD5241/AD5242 provide a single-/dual-channel, 256-
position, digitally controlled variable resistor (VR) device. These
devices perform the same electronic adjustment function as a
potentiometer, trimmer, or variable resistor. Each VR offers a
completely programmable value of resistance between the A
terminal and the wiper, or the B terminal and the wiper. For the
AD5242, the fixed A-to-B terminal resistance of 10 kΩ, 100 kΩ,
or 1 MΩ has a 1% channel-to-channel matching tolerance. The
nominal temperature coefficient of both parts is 30 ppm/°C.
Wiper position programming defaults to midscale at system
power on. When powered, the VR wiper position is programmed
by an I2C®-compatible, 2-wire serial data interface. Both parts
have two extra programmable logic outputs available that
enable users to drive digital loads, logic gates, LED drivers, and
analog switches in their system.
The AD5241/AD5242 are available in surface-mount, 14-lead
SOIC and 16-lead SOIC packages and, for ultracompact solutions,
14-lead TSSOP and 16-lead TSSOP packages. All parts are
guaranteed to operate over the extended temperature range of
−40°C to +105°C.
Rev. C
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.
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 ©2001–2009 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5242 Datasheet

2-Channel/ 256-Position Digital Potentiometer

No Preview Available !

AD5242 pdf
AD5241/AD5242
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Functional Block Diagram .............................................................. 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
10 kΩ, 100 kΩ, 1 MΩ Version .................................................... 3 
Timing Diagrams.......................................................................... 5 
Absolute Maximum Ratings............................................................ 6 
ESD Caution.................................................................................. 6 
Pin Configurations and Function Descriptions ........................... 7 
Typical Performance Characteristics ............................................. 8 
REVISION HISTORY
12/09—Rev. B to Rev. C
Changes to Features Section............................................................ 1
Changes to 10 kΩ, 100 kΩ, 1 MΩ Version Section...................... 3
Changes to Table 3............................................................................ 6
Deleted Digital Potentiometer Selection Guide Section ........... 14
Changed Self-Contained Shutdown Function Section to
Shutdown Function Section .......................................................... 15
Changes to Shutdown Function Section ..................................... 15
Changes to Ordering Guide .......................................................... 18
8/02—Rev. A to Rev. B
Additions to Features ....................................................................... 1
Changes to General Description .................................................... 1
Changes to Specifications ................................................................ 2
Changes to Absolute Maximum Ratings ....................................... 4
Additions to Ordering Guide.......................................................... 4
Changes to TPC 8 and TPC 9 ......................................................... 8
Changes to Readback RDAC Value Section................................ 11
Changes to Additional Programmable Logic Output Section.. 11
Added Self-Contained Shutdown Section................................... 12
Added Figure 8................................................................................ 12
Changes to Digital Potentiometer Selection Guide ................... 14
Test Circuits..................................................................................... 11 
Theory of Operation ...................................................................... 12 
Programming the Variable Resistor......................................... 12 
Programming the Potentiometer Divider............................... 13 
Digital Interface.......................................................................... 13 
Readback RDAC Value.............................................................. 14 
Multiple Devices on One Bus ................................................... 14 
Level-Shift for Bidirectional Interface ..................................... 14 
Additional Programmable Logic Output ................................ 15 
Shutdown Function.................................................................... 15 
Outline Dimensions ....................................................................... 16 
Ordering Guide .......................................................................... 18 
2/02—Rev. 0 to Rev. A
Edits to Features.................................................................................1
Edits to Functional Block Diagrams ...............................................1
Edits to Absolute Maximum Ratings ..............................................4
Changes to Ordering Guide .............................................................4
Edits to Pin Function Descriptions.................................................5
Edits to Figures 1, 2, 3 .......................................................................6
Added Readback RDAC Value Section, Additional
Programmable Logic Output Section, and Figure 7;
Renumbered Sequentially ............................................................. 11
Changes to Digital Potentiometer Selection Guide ................... 14
Rev. C | Page 2 of 20


Part Number AD5242
Description 2-Channel/ 256-Position Digital Potentiometer
Maker Analog Devices
Total Page 20 Pages
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