Rainbow-electronics MAX9704 Manual de usuario descargar pdf

General Description

The MAX9703/MAX9704 mono/stereo class D audio

power amplifiers provide class AB amplifier performance

with class D efficiency, conserving board space and

eliminating the need for a bulky heatsink. Using a class

D architecture, these devices deliver up to 15W while

offering up to 78% efficiency. Proprietary and patent-pro-

tected modulation and switching schemes render the tra-

ditional class D output filter unnecessary.

The MAX9703/MAX9704 offer two modulation schemes:

a fixed-frequency mode (FFM), and a spread-spectrum

mode (SSM) that reduces EMI-radiated emissions due

to the modulation frequency. The device utilizes a fully

differential architecture, a full bridged output, and com-

prehensive click-and-pop suppression.

The MAX9703/MAX9704 feature high 80dB PSRR, low

0.07% THD+N, and SNR in excess of 100dB. Short-cir-

cuit and thermal-overload protection prevent the

devices from being damaged during a fault condition.

The MAX9703 is available in a 32-pin TQFN (5mm x

5mm x 0.8mm) package. The MAX9704 is available in a

32-pin TQFN (7mm x 7mm x 0.8mm) package. Both

devices are specified over the extended -40°C to

+85°C temperature range.

Applications

Features

♦ Filterless Class D Amplifier

♦ Unique Spread-Spectrum Mode Offers 5dB

Emissions Improvement Over Conventional

Methods

♦ Up to 78% Efficient

♦ 15W Output Power into 8Ω

♦ Up to 20W Peak Power

♦ Low 0.07% THD+N

♦ High PSRR (80dB at 1kHz)

♦ 10V to 25V Single-Supply Operation

♦ Differential Inputs Minimize Common-Mode Noise

♦ Pin-Selectable Gain Reduces Component Count

♦ Industry-Leading Click-and-Pop Suppression

♦ Low Quiescent Current (24mA)

♦ Low-Power Shutdown Mode (0.2µA)

♦ Short-Circuit and Thermal-Overload Protection

♦ Available in Thermally Efficient, Space-Saving

Packages

32-Pin TQFN (5mm x 5mm x 0.8mm)–MAX9703

32-Pin TQFN (7mm x 7mm x 0.8mm)–MAX9704

MAX9703/MAX9704

15W, Filterless, Spread-Spectrum

Mono/Stereo Class D Amplifiers

________________________________________________________________ Maxim Integrated Products 1

19-3160; Rev 1; 3/04

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.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

AMP

MAX9703ETJ

-40

C to +85

32 TQFN-EP*

Mono

MAX9704ETJ

-40

C to +85

32 TQFN-EP*

Stereo

*EP = Exposed paddle.

LCD TVs

LCD Monitors

Desktop PCs

LCD Projectors

Hands-Free Car

Phone Adaptors

Automotive

Pin Configurations appear at end of data sheet.

MAX9704

0.47µF

INL+ OUTL+

OUTL-INL-

0.47µF

H-BRIDGE

0.47µF

INR+ OUTR+

OUTR-INR-

0.47µF

H-BRIDGE

MAX9703

0.47µF

IN+ OUT+

OUT-

IN-

0.47µF

H-BRIDGE

Block Diagrams

1 2 3 4 5 6 ... 17 18

Indice de contenidos

Pagina 1 - MAX9703/MAX9704

General DescriptionThe MAX9703/MAX9704 mono/stereo class D audiopower amplifiers provide class AB amplifier performancewith class D efficiency, conser

Pagina 2

MAX9703/MAX9704Input AmplifierDifferential InputThe MAX9703/MAX9704 feature a differential input struc-ture, making them compatible with many CODECs,

Pagina 3

Supply Bypassing/LayoutProper power-supply bypassing ensures low distortionoperation. For optimum performance, bypass VDDtoPGND with a 0.1µF capacitor

Pagina 4

MAX9703/MAX970415W, Filterless, Spread-SpectrumMono/Stereo Class D Amplifiers12 ______________________________________________________________________

Pagina 5