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Analog Devices Semiconductor Electronic Components Datasheet

AD5259 Datasheet

256-Position Digital Potentiometer

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AD5259 pdf
Nonvolatile, I2C-Compatible
256-Position, Digital Potentiometer
AD5259
FEATURES
Nonvolatile memory maintains wiper settings
256-position
Thin LFCSP-10 (3 mm x 3 mm x 0.8 mm) package
Compact MSOP-10 (3 mm × 4.9 mm x 1.1mm) package
I2C®-compatible interface
VLOGIC pin provides increased interface flexibility
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Resistance tolerance stored in EEPROM (0.1% accuracy)
Power-on EEPROM refresh time < 1ms
Software write protect command
Address Decode Pin AD0 and Pin AD1 allow
4 packages per bus
100-year typical data retention at 55°C
Wide operating temperature 40°C to +85°C
3 V to 5 V single supply
APPLICATIONS
LCD panel VCOM adjustment
LCD panel brightness and contrast control
Mechanical potentiometer replacement in new designs
Programmable power supplies
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
Fiber to the home systems
Electronics level settings
GENERAL DESCRIPTION
The AD5259 provides a compact, nonvolatile LFCSP-10
(3 mm × 3 mm) or MSOP-10 (3 mm × 4.9 mm) packaged
solution for 256-position adjustment applications. These
devices perform the same electronic adjustment function
as mechanical potentiometers1 or variable resistors, but
with enhanced resolution and solid-state reliability.
The wiper settings are controllable through an I2C-compatible
digital interface that is also used to read back the wiper register
and EEPROM content. Resistor tolerance is also stored within
EEPROM, providing an end-to-end tolerance accuracy of 0.1%.
A separate VLOGIC pin delivers increased interface flexibility. For
users who need multiple parts on one bus, Address Bit AD0 and
Address Bit AD1 allow up to four devices on the same bus.
FUNCTIONAL BLOCK DIAGRAMS
VDD
VLOGIC
GND
SCL
SDA
AD0
AD1
RDAC
EEPROM
RDAC
REGISTER
RDAC
I2C
SERIAL
INTERFACE
POWER-
ON RESET
8 DATA
8 CONTROL
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL LOGIC
AD5259
A
W
B
VLOGIC
Figure 1. Block Diagram
VDD
SCL
SDA
AD0
AD1
GND
EEPROM
I2C
SERIAL
INTERFACE
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL
LOGIC
RDAC
REGISTER
AND
LEVEL
SHIFTER
Figure 2. Block Diagram Showing Level Shifters
A
W
B
CONNECTION DIAGRAM
W1
10 A
AD0 2 AD5259 9 B
AD1 3 TOP VIEW 8 VDD
SDA 4 (Not to Scale) 7 GND
SCL 5
6 VLOGIC
Figure 3. Pinout
1 The terms digital potentiometer, VR (variable resistor), and RDAC are used
interchangeably.
Rev. A
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: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5259 Datasheet

256-Position Digital Potentiometer

No Preview Available !

AD5259 pdf
AD5259
TABLE OF CONTENTS
Specifications..................................................................................... 3
Electrical Characteristics............................................................. 3
Timing Characteristics ................................................................ 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Test Circuits..................................................................................... 13
Theory of Operation ...................................................................... 14
Programming the Variable Resistor......................................... 14
Programming the Potentiometer Divider ............................... 14
I2C-Compatible Interface............................................................... 15
Writing ......................................................................................... 15
Storing/Restoring ....................................................................... 15
Reading ........................................................................................ 15
REVISION HISTORY
7/05 — Rev. 0 to Rev. A
Added 10-Lead LFCSP.......................................................Universal
Changes to Features Section and
General Description Section ........................................................... 1
Changes to Table 1............................................................................ 3
Changes to Table 2 and Added Figure 4 ........................................ 5
Changes to Table 4............................................................................ 7
Changes to Figure 27 Caption....................................................... 11
Changes to Theory of Operation Section.................................... 14
Changes to I2C-Compatible Interface Section............................ 15
Changes to Table 5.......................................................................... 16
Changes to Multiple Devices on One Bus Section..................... 19
Updated Figure 49 Caption ........................................................... 21
Changes to Ordering Guide .......................................................... 21
2/05 — Revision 0: Initial Version
I2C-Compatible Format ................................................................. 16
Generic Interface ........................................................................ 16
Write Modes................................................................................ 16
Read Modes................................................................................. 17
Store/Restore Modes .................................................................. 17
Tolerance Readback Modes ...................................................... 18
ESD Protection of Digital Pins and Resistor Terminals........ 19
Power-Up Sequence ................................................................... 19
Layout and Power Supply Bypassing ....................................... 19
Multiple Devices on One Bus ................................................... 19
Evaluation Board ........................................................................ 19
Display Applications ...................................................................... 20
Circuitry ...................................................................................... 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 21
Rev. A | Page 2 of 24


Part Number AD5259
Description 256-Position Digital Potentiometer
Maker Analog Devices
Total Page 24 Pages
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