Rainbow-electronics MAX5499 Manual de usuario descargar pdf

General Description

The MAX5494–MAX5499 10-bit (1024-tap), dual, non-

volatile, linear-taper, programmable voltage-dividers

and variable resistors perform the function of a

mechanical potentiometer, but replace the mechanics

with a 3-wire SPI™-compatible serial interface. The

MAX5494/MAX5495 are dual, 3-terminal, programma-

ble voltage-dividers; the MAX5496/MAX5497 are dual,

2-terminal variable resistors; and the MAX5498/

MAX5499 include one 2-terminal variable resistor and

one 3-terminal programmable voltage-divider.

The MAX5494–MAX5499 feature an internal, nonvolatile,

electrically erasable programmable read-only memory

(EEPROM) that stores the wiper position for initialization

during power-up. The 3-wire SPI-compatible serial inter-

face allows communication at data rates up to 7MHz.

The MAX5494–MAX5499 are ideal for applications requir-

ing digitally controlled potentiometers. End-to-end resis-

tance values of 10kΩ and 50kΩ are available with a

35ppm/°C end-to-end temperature coefficient. The ratio-

metric temperature coefficient is 5ppm/°C for each chan-

nel, making these devices ideal for applications requiring

low-temperature-coefficient programmable voltage-

dividers such as low-drift, programmable-gain amplifiers.

The MAX5494–MAX5499 operate with either a single

power supply (+2.7V to +5.25V) or dual power supplies

(±2.5V). The devices consume 400µA (max) of supply

current when writing data to the nonvolatile memory

and 1.5µA (max) of standby supply current. The

devices are available in space-saving (5mm x 5mm x

0.8mm), 16-pin TQFN package and are specified over

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

Applications

Gain and Offset Adjustment

LCD Contrast Adjustment

Pressure Sensors

Low-Drift Programmable-Gain Amplifiers

Mechanical Potentiometer Replacement

Volume Control

Features

♦ Wiper Position Stored in Nonvolatile Memory and

Recalled Upon Power-Up

♦ 16-Pin, 5mm x 5mm x 0.8mm TQFN Package

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

Coefficient

♦ 5ppm/°C Ratiometric Temperature Coefficient

♦ 10kΩ and 50kΩ End-to-End Resistor Values

♦ 3-Wire SPI-Compatible Serial Interface

♦ Reliability (T

= +85°C)

50,000 Wiper Store Cycles

50 Years Wiper Data Retention

♦ 1.5µA (max) Standby Current

♦ Single +2.7V to +5.25V Supply Operation

♦ Dual ±2.5V Supply Operation

MAX5494–MAX5499

10-Bit, Dual, Nonvolatile, Linear-Taper

Digital Potentiometers

________________________________________________________________ Maxim Integrated Products 1

1234

12 11 10 9

SCLK

N.C.

DIN

GNDINTERFACE

N.C.

TOP VIEW

MAX5494

MAX5495

5mm × 5mm × 0.8mm TQFN

1234

12 11 10 9

SCLK

N.C.

DIN

GNDINTERFACE

D.N.C.

N.C.

MAX5496

MAX5497

5mm × 5mm × 0.8mm TQFN

PART TEMP RANGE

PIN-

PACKAGE

PKG CODE

MAX5494ETE -40°C to +85°C 16 TQFN-EP* T1655-2

MAX5495ETE -40°C to +85°C 16 TQFN-EP* T1655-2

Pin Configurations

Ordering Information

19-3562; Rev 1; 6/05

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.

*EP = Exposed pad.

Ordering Information continued at end of data sheet.

Selector Guide appears at end of data sheet.

Pin Configurations continued at end of data sheet.

SPI is a trademark of Motorola, Inc.

1 2 3 4 5 6 ... 19 20

Indice de contenidos

Pagina 1 - Digital Potentiometers

General DescriptionThe MAX5494–MAX5499 10-bit (1024-tap), dual, non-volatile, linear-taper, programmable voltage-dividersand variable resistors perfor

Pagina 2

MAX5494–MAX549910-Bit, Dual, Nonvolatile, Linear-Taper Digital Potentiometers10 ______________________________________________________________________

Pagina 3