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AD5259 Datasheet

  • AD5259

  • Nonvolatile, I2C-Compatible 256-Position, Digital Potentiome...

  • 1618.13KB

  • 26页

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Nonvolatile, I
2
C-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 脳 4.9 mm x 1.1mm) package
I
2
C庐-compatible interface
V
LOGIC
pin provides increased interface flexibility
End-to-end resistance 5 k惟, 10 k惟, 50 k惟, 100 k惟
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掳C
Wide operating temperature
鈭?0掳C
to +85掳C
3 V to 5 V single supply
V
DD
V
LOGIC
GND
8
I
2
C
SERIAL
INTERFACE
8
DATA
CONTROL
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL LOGIC
RDAC
EEPROM
RDAC
REGISTER
FUNCTIONAL BLOCK DIAGRAMS
RDAC
A
W
B
SCL
SDA
AD0
AD1
AD5259
05026-001
POWER-
ON RESET
Figure 1. Block Diagram
V
LOGIC
V
DD
A
EEPROM
APPLICATIONS
LCD panel V
COM
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
SCL
SDA
AD0
AD1
I
2
C
SERIAL
INTERFACE
COMMAND
DECODE LOGIC
ADDRESS
DECODE LOGIC
CONTROL
LOGIC
RDAC
REGISTER
AND
LEVEL
SHIFTER
W
GND
B
Figure 2. Block Diagram Showing Level Shifters
GENERAL DESCRIPTION
The AD5259 provides a compact, nonvolatile LFCSP-10
(3 mm 脳 3 mm) or MSOP-10 (3 mm 脳 4.9 mm) packaged
solution for 256-position adjustment applications. These
devices perform the same electronic adjustment function
as mechanical potentiometers
1
or variable resistors, but
with enhanced resolution and solid-state reliability.
The wiper settings are controllable through an I
2
C-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 V
LOGIC
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.
1
CONNECTION DIAGRAM
W
1
AD0
2
AD1
3
10
A
B
AD5259
9
8
SCL
5
6
V
LOGIC
Figure 3. Pinout
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
漏 2005 Analog Devices, Inc. All rights reserved.
05026-002
V
DD
TOP VIEW
(Not to Scale)
7
GND
SDA
4
05026-003

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