64-Position, Digital Potentiometer

Data Sheet

AD5258

Rev. D

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FEATURES

Nonvolatile memory maintains wiper settings

64-position digital potentiometer

Compact MSOP-10 (3 mm × 4.9 mm)

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

Address Decode Pin AD0 and Address Decode Pin AD1 allow

four 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 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

FUNCTIONAL BLOCK DIAGRAMS

RDAC

REGISTER

RDAC

DATA

CONTROL

COMMAND

DECODE LOGIC

ADDRESS

DECODE LOGIC

CONTROL LOGIC

AD5258

SERIAL

INTERFACE

POWER-

ON RESET

A

W

B

SCL

SDA

AD0

AD1

GND

RDAC

EEPROM

6

6

Figure 1. Block Diagram

COMMAND

DECODE LOGIC

ADDRESS

DECODE LOGIC

CONTROL

LOGIC

SCL

SDA

AD0

AD1

GND

EEPROM

SERIAL

INTERFACE

RDAC

REGISTER

AND

LEVEL

SHIFTER

A

W

B

Figure 2. Block Diagram Showing Level Shifters

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.

digital interface that is also used to read back the wiper register

and EEPROM content in addition, resistor tolerance is 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.

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

The terms digital potentiometer, VR (variable resistor), and RDAC are used

interchangeably.