256-Position, Digital Potentiometer

Preliminary Technical Data

AD5259

Rev. PrJ 7/22/04 | Page 1 of 14

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 companies.

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

© 2004 Analog Devices, Inc. All rights reserved.

FEATURES

Nonvolatile memoy maintains wiper settings

256-position

Compact MSOP-10 (3 mm × 4.9 mm) package

End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ

Resistance tolerance stored in EEMEM(0.1% accuracy)

Power On EEMEM Refresh Time < 1ms

Software write protect command

Tri-state address decode pins AD0 and AD1

100-year typical data retention at 55°C

Wide operating temperature –40°C to +85°C

+3V to +5V single-supply

APPLICATIONS

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

Low resolution DAC replacement

Electronics level settings

GENERAL OVERVIEW

The AD5259 provides a compact nonvolatile 3 mm × 4.9 mm

packaged solution for 256-position adjustment applications.

These devices perform the same electronic adjustment function

as mechanical potentiometers or variable resistors, with

enhanced resolution and solid-state reliability.

digital interface, which can also be used to read back the wiper

register and EEMEM content. Resistor tolerance is also stored

within EEMEM and can be used to provide an end-to-end

tolerance accuracy of 0.1%. In order to provide added security,

command bits are available to place the part into a write protect

mode in which data can not be written to the EEMEM register.

increased interface flexibility. For users who need multiple

parts on one bus, address bits AD0 and AD1 allow up to nine

devices on the same bus.

FUNCTIONAL BLOCK DIAGRAMS

DATA

CONTROL

RDAC EEPROM

COMMAND DECODE LOGIC

ADDRESS DECODE LOGIC

CONTROL LOGIC

RDAC1

REGISTER

A1

W1

B1

RDAC1

SCL

SDA

I2C

SERIAL

INTERFACE

AD0

VDD

VLOGIC

8

POWER

ON RESET

8

DGND

AD1

Figure 1.

Figure 3. Pinout.

Note:

The terms digital potentiometer, VR, and RDAC are used interchangeably.

Purchase of licensed I

Associated Companies conveys a license for the purchaser under the Philips I

Patent Rights to use these components in an I

conforms to the I

1

2

3

4

5

10

9

8

7

6

W

AD0

AD1

SDA

SCL

AD5259

TOP VIEW

(Not to Scale)

A

B

VDD

GND

VLOGIC