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Rainbow Electronics MAX9704 User Manual

General description, Applications features, Ordering information

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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

MAX9703

ETJ

-40

o

C to +85

o

C

32 TQFN-EP*

Mono

MAX9704

ETJ

-40

o

C to +85

o

C

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