max5423eta Maxim Integrated Products, Inc., max5423eta Datasheet

max5423eta

Manufacturer Part Number

max5423eta

Description

256-tap, Nonvolatile, Spi-interface, Digital Potentiometers

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX5423ETA.pdf (11 pages)

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Download datasheet (391Kb)

The MAX5422/MAX5423/MAX5424 nonvolatile, linear-

taper, digital potentiometers perform the function of a

mechanical potentiometer, but replace the mechanics

with a simple 3-wire SPI™-compatible digital interface.

Each device performs the same function as a discrete

potentiometer 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. The 3-wire SPI-compatible serial interface

allows communication at data rates up to 5MHz, mini-

mizing board space and reducing interconnection com-

plexity in many applications.

The MAX5422/MAX5423/MAX5424 provide three nomi-

nal resistance values: 50kΩ (MAX5422), 100kΩ

(MAX5423), or 200kΩ (MAX5424). The nominal resistor

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

only 5ppm/°C ratiometric. This makes the devices ideal

for applications requiring a low-temperature-coefficient

variable resistor, such as low-drift, programmable gain-

amplifier circuit configurations.

The MAX5422/MAX5423/MAX5424 are available in a

3mm x 3mm 8-pin TDFN package, and are specified

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

19-3371; Rev 0; 7/04

* EP = Exposed pad.

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.

MAX5422ETA

MAX5423ETA

MAX5424ETA

SCLK

GND

DIN

Mechanical Potentiometer Replacement

Low-Drift Programmable Gain Amplifiers

Audio Volume Control

Liquid-Crystal Display (LCD) Contrast Control

Low-Drift Programmable Filters

PART

INTERFACE

SHIFT

8-BIT

SPI

________________________________________________________________ Maxim Integrated Products

POR

General Description

Functional Diagram

MEMORY

LATCH

8-BIT

-40°C to +85°C

TEMP RANGE

256-Tap, Nonvolatile, SPI-Interface,

POSITION

DECODER

Applications

MAX5422

MAX5423

MAX5424

256-

256

RESISTANCE (kΩ)

END-TO-END

100

200

Ordering Information/Selector Guide

o Wiper Position Stored in Nonvolatile Memory

o 3mm x 3mm x 0.8mm TDFN Package

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

o 5ppm/°C Ratiometric Temperature Coefficient

o 50kΩ, 100kΩ, and 200kΩ Resistor Values

o 5MHz SPI-Compatible Serial Interface

o 500nA (typ) Static Supply Current

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

o 256 Tap Positions

o ±0.5 LSB DNL in Voltage-Divider Mode

o ±0.5 LSB INL in Voltage-Divider Mode

SPI is a trademark of Motorola, Inc.

Digital Potentiometers

(EEPROM) and Recalled Upon Power-Up or

Interface Command

Coefficient

TOP VIEW

SCLK

DIN

PIN-PACKAGE

8 TDFN-EP*

TDFN (3mm x 3mm)

MAX5422

MAX5423

MAX5424

Pin Configuration

TOP MARK

Features

GND

AIH

AIJ

AII

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