Nonvolatile, I2C-Compatible
64-Position, Digital Potentiometer
AD5258
FUNCTIONAL BLOCK DIAGRAMS
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
RDAC
V
DD
A
RDAC
V
RDAC
LOGIC
EEPROM
W
REGISTER
GND
B
6
6
DATA
CONTROL
SCL
SDA
2
I C
SERIAL
INTERFACE
AD0
AD1
COMMAND
DECODE LOGIC
AD5258
ADDRESS
DECODE LOGIC
POWER-
ON RESET
Three-state Address Decode Pins AD0 and AD1 allow
9 packages per bus
CONTROL LOGIC
100-year typical data retention at 55°C
Wide operating temperature −40°C to +85°C
3 V to 5 V single supply
Figure 1. Block Diagram
V
V
DD
LOGIC
A
EEPROM
APPLICATIONS
SCL
SDA
AD0
AD1
RDAC
REGISTER
AND
2
I C
LCD panel VCOM adjustment
SERIAL
INTERFACE
LEVEL
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
SHIFTER
W
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL
LOGIC
GND
B
Figure 2. Block Diagram Showing Level Shifters
Electronics level settings
GENERAL DESCRIPTION
CONNECTION DIAGRAM
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.
W
AD0
AD1
SDA
SCL
1
2
3
4
5
10
9
A
B
V
AD5258
8
TOP VIEW
DD
(Not to Scale)
7
GND
6
V
LOGIC
Figure 3. Pinout
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.
1 The terms digital potentiometer, VR (variable resistor), and RDAC are used
interchangeably.
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.
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
Fax: 781.326.8703
www.analog.com
© 2005 Analog Devices, Inc. All rights reserved.
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