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General Description

The MAX5477/MAX5478/MAX5479 nonvolatile, dual,

linear-taper, digital potentiometers perform the function

of a mechanical potentiometer, but replace the

mechanics with a simple 2-wire digital interface. Each

device performs the same function as a discrete poten-

tiometer or variable resistor and has 256 tap points.

The devices feature an internal, nonvolatile EEPROM

used to store the wiper position for initialization during

power-up. A write-protect feature prevents accidental

overwrites of the EEPROM. The fast-mode I

C-compati-

ble serial interface allows communication at data rates

up to 400kbps, minimizing board space and reducing

interconnection complexity in many applications. Three

address inputs allow a total of eight unique address

combinations.

The MAX5477/MAX5478/MAX5479 provide three nomi-

nal resistance values: 10kΩ (MAX5477), 50kΩ

(MAX5478), or 100kΩ (MAX5479). The nominal resistor

temperature coefficient is 35ppm/°C end-to-end and

5ppm/°C ratiometric. The low temperature coefficient

makes the devices ideal for applications requiring a low-

temperature-coefficient variable resistor, such as low-

drift, programmable gain-amplifier circuit configurations.

The MAX5477/MAX5478/MAX5479 are available in 16-

pin 3mm x 3mm x 0.8mm thin QFN and 14-pin 4.4mm x

5mm TSSOP packages. These devices operate over

the extended -40°C to +85°C temperature range.

Applications

Mechanical Potentiometer Replacement

Low-Drift Programmable-Gain Amplifiers

Volume Control

Liquid-Crystal Display (LCD) Contrast Control

Features

♦ Power-On Recall of Wiper Position from

Nonvolatile Memory

♦ EEPROM Write Protection

♦ Tiny 3mm x 3mm x 0.8mm Thin QFN Package

♦ 35ppm/°C End-to-End Resistance Temperature

Coefficient

♦ 5ppm/°C Ratiometric Temperature Coefficient

♦ Fast 400kbps I

†

-Compatible Serial Interface

♦ 1µA (max) Static Supply Current

♦ Single-Supply Operation: +2.7V to +5.25V

♦ 256 Tap Positions per Potentiometer

♦ ±0.5 LSB DNL in Voltage-Divider Mode

♦ ±1 LSB INL in Voltage-Divider Mode

MAX5477/MAX5478/MAX5479

Dual, 256-Tap, Nonvolatile, I

C-Interface,

Digital Potentiometers

________________________________________________________________ Maxim Integrated Products 1

MAX5477

MAX5478

MAX5479

8-BIT

SHIFT

POR

16-BIT

LATCH

16-BIT

MEMORY

SDA

SCL

256

POSITION

DECODER

256

POSITION

DECODER

256

GND

INTERFACE

Ordering Information/Selector Guide

Functional Diagram

19-3379; Rev 2; 12/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations appear at end of data sheet.

†Purchase of I

C components from Maxim Integrated

Products, Inc. or one of its sublicensed Associated

Companies, conveys a license under the Philips I

C Patent

Rights to use these components in an I

C system, provided

that the system conforms to the I

C Standard Specification as

defined by Philips.

PART TEMP RANGE PIN-PACKAGE

END-TO-END

RESISTANCE (kΩ)

TOP

MARK

PACKAGE CODE

MAX5477ETE* -40°C to +85°C 16 Thin QFN 10 ABO T1633F-3

MAX5477EUD* -40°C to +85°C 14 TSSOP 10 — —

MAX5478ETE* -40°C to +85°C 16 Thin QFN 50 ABP T1633F-3

MAX5478EUD -40°C to +85°C 14 TSSOP 50 — —

MAX5479ETE* -40°C to +85°C 16 Thin QFN 100 ABQ T1633F-3

MAX5479EUD -40°C to +85°C 14 TSSOP 100 — —

*Future product—contact factory for availability.

1 2 3 4 5 6 ... 14 15

Sommario

Pagina 1 - Digital Potentiometers

General DescriptionThe MAX5477/MAX5478/MAX5479 nonvolatile, dual, linear-taper, digital potentiometers perform the functionof a mechanical potentiome

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MAX5477/MAX5478/MAX5479Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital PotentiometersMaxim cannot assume responsibility for use of any circuitry ot

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MAX5477/MAX5478/MAX5479Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers______________________________________________________________

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