Rainbow-electronics MAX5489 Instrukcja Użytkownika Pobierz pdf

General Description

The MAX5487/MAX5488/MAX5489 dual, linear-taper,

digital potentiometers function as mechanical poten-

tiometers with a simple 3-wire SPI™-compatible digital

interface that programs the wipers to any one of 256

tap positions. These digital potentiometers feature a

nonvolatile memory (EEPROM) to return the wipers to

their previously stored positions upon power-up.

The MAX5487 has an end-to-end resistance of 10kΩ,

while the MAX5488 and MAX5489 have resistances of

50kΩ and 100kΩ, respectively. These devices have a

low 35ppm/°C end-to-end temperature coefficient, and

operate from a single +2.7V to +5.25V supply.

The MAX5487/MAX5488/MAX5489 are available in a

16-pin 3mm x 3mm x 0.8mm thin QFN package. Each

device is guaranteed over the extended -40°C to +85°C

temperature range.

Applications

LCD Screen Adjustment

Audio Volume Control

Mechanical Potentiometer Replacement

Low-Drift Programmable Filters

Low-Drift Programmable-Gain Amplifiers

Features

♦ Wiper Position Stored in Nonvolatile Memory

(EEPROM) and Recalled Upon Power-Up or

Recalled by an Interface Command

♦ 3mm x 3mm x 0.8mm Thin QFN Package

♦ ±1 LSB INL, ±0.5 LSB DNL (Voltage-Divider Mode)

♦ 256 Tap Positions

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

Coefficient

♦ 5ppm/°C Ratiometric Temperature Coefficient

♦ 10kΩ, 50kΩ, and 100kΩ End-to-End Resistance

Values

♦ SPI-Compatible Serial Interface

♦ Reliability

200,000 Wiper Store Cycles

50-Year Wiper Data Retention

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

MAX5487/MAX5488/MAX5489

Dual, 256-Tap, Nonvolatile, SPI-Interface,

Linear-Taper Digital Potentiometers

________________________________________________________________ Maxim Integrated Products 1

19-3478; Rev 1; 1/05

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.

SPI is a trademark of Motorola, Inc.

Ordering Information/Selector Guide

PART TEMP RANGE PIN-PACKAGE

END-TO-END

RESISTANCE (kΩ)

TOP MARK

MAX5487ETE* -40°C to +85°C 16 Thin QFN-EP** 10 ABR

MAX5488ETE -40°C to +85°C 16 Thin QFN-EP** 50 ABS

MAX5489ETE -40°C to +85°C 16 Thin QFN-EP** 100 ABT

*Future product—contact factory for availability.

**EP = Exposed pad.

MAX5487

MAX5488

MAX5489

POR

8-BIT

LATCH

16-BIT

NV RAM

SCLK

DIN

DECODER

256

DECODER

256

GND

SPI

INTERFACE

8-BIT

LATCH

Functional Diagram

15 14 13

5678

N.C.

SCLK

DIN

N.C.

GND

N.C.

TOP VIEW

EXPOSED PAD CONNECTED TO GND.

MAX5487

MAX5488

MAX5489

THIN QFN

3mm × 3mm

Pin Configuration

1 2 3 4 5 6 ... 13 14

Podsumowanie treści

Strona 1 - MAX5487/MAX5488/MAX5489

General DescriptionThe MAX5487/MAX5488/MAX5489 dual, linear-taper,digital potentiometers function as mechanical poten-tiometers with a simple 3-wire S

Strona 2

MAX5487/MAX5488/MAX5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers10 _______________________________________________

Strona 3