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Nonvolatile, I2C-Compatible
64-Position, Digital Potentiometer
AD5258
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 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
© 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Nonvolatile memory maintains wiper settings
64-position
Compact MSOP-10 (3 mm × 4.9 mm) package
I2C®-compatible interface
VLOGIC pin provides increased interface flexibility
End-to-end resistance 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Resistance tolerance stored in EEPROM (0.1% accuracy)
Power-on EEPROM refresh time <1 ms
Software write protect command
Three-state Address Decode Pins AD0 and AD1 allow
9 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 AD5258 provides a compact, nonvolatile 3 mm × 4.9 mm
packaged solution for 64-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%.
There is also a software write protection function that ensures
data cannot be written to the EEPROM register.
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 nine devices on the same bus.
FUNCTIONAL BLOCK DIAGRAMS
RDAC
REGISTER
RDAC
DATA
CONTROL
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL LOGIC
AD5258
I2C
SERIAL
INTERFACE
POWER-
ON RESET
A
W
B
SCL
SDA
AD0
AD1
VDD
VLOGIC
GND
RDAC
EEPROM
6
6
Figure 1. Block Diagram
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL
LOGIC
SCL
SDA
AD0
AD1
GND
EEPROM
I2C
SERIAL
INTERFACE
RDAC
REGISTER
AND
LEVEL
SHIFTER
A
W
B
VLOGIC
VDD
Figure 2. Block Diagram Showing Level Shifters
CONNECTION DIAGRAM
AD5258
TOP VIEW
(Not to Scale)
W
1
AD0
2
AD1
3
SDA
4
SCL
5
A
B
VDD
GND
VLOGIC
10
9
8
7
6
Figure 3. Pinout
1 The terms digital potentiometer, VR (variable resistor), and RDAC are used
interchangeably.


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