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General Description

The MAX9712 mono class D audio power amplifier pro-

vides class AB amplifier performance with class D effi-

ciency, conserving board space, and extending battery

life. Using a class D architecture, the MAX9712 delivers

up to 500mW into an 8Ω load while offering efficiencies

above 85%. A patented, low EMI modulation scheme

renders the traditional class D output filter unnecessary.

The MAX9712 offers two modulation schemes: a fixed-

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

mode that reduces EMI-radiated emissions due to the

modulation frequency. Furthermore, the MAX9712 oscil-

lator can be synchronized to an external clock through

the SYNC input, allowing the switching frequency to be

user defined. The SYNC input also allows multiple

MAX9712s to be cascaded and frequency locked, mini-

mizing interference due to clock intermodulation. The

device utilizes a fully differential architecture, a full-

bridged output, and comprehensive click-and-pop sup-

pression. The gain is internally set to +4V/V, further

reducing external component count.

The MAX9712 features high 72dB PSRR, a low 0.01%

THD+N, and SNR in excess of 90dB. Short-circuit and

thermal-overload protection prevent the device from

damage during a fault condition. The MAX9712 is avail-

able in 10-pin TDFN (3mm

3mm

0.8mm), 10-pin

µMAX, and 12-bump UCSP™ (1.5mm

2mm

0.6mm)

packages. The MAX9712 is specified over the extended

-40°C to +85°C temperature range.

Applications

Features

♦ Filterless Amplifier Passes FCC Radiated

Emissions Standards with 100mm of Cable

♦ Unique Spread-Spectrum Mode Offers 5dB

Emissions Improvement Over Conventional

Methods

♦ Optional External SYNC Input

♦ Simple Master-Slave Setup for Stereo Operation

♦ 85% Efficiency

♦ Up to 500mW into 8Ω

♦ Low 0.01% THD+N

♦ High PSRR (72dB at 217Hz)

♦ Integrated Click-and-Pop Suppression

♦ Low Quiescent Current (4mA)

♦ Low-Power Shutdown Mode (0.1µA)

♦ Short-Circuit and Thermal-Overload Protection

♦ Available in Thermally Efficient, Space-Saving

Packages

10-Pin TDFN (3mm

3mm

0.8mm)

10-Pin µMAX

12-Bump UCSP (1.5mm

2mm

0.6mm)

MAX9712

500mW, Low EMI, Filterless,

Class D Audio Amplifier

________________________________________________________________ Maxim Integrated Products 1

OUT-

OUT+

PGNDGND

IN-

IN+

MAX9712

TDFN/µMAX

TOP VIEW

SYNCSHDN

Pin Configurations

Ordering Information

MAX9712

DIFFERENTIAL

AUDIO INPUT

SYNC

INPUT

OSCILLATOR

MODULATOR

AND H-BRIDGE

Simplified Block Diagram

19-2917; Rev 0; 8/03

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.

Cellular Phones

PDAs

MP3 Players

Portable Audio

PART TEMP RANGE

PIN/BUMP-

PACKAGE

TOP

MARK

MAX9712ETB -40°C to +85°C 10 TDFN AAI

MAX9712EUB -40°C to +85°C 10 µMAX —

MAX9712EBC-T* -40°C to +85°C 12 UCSP-12 ABN

Pin Configurations continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

*Future product—contact factory for availability.

1 2 3 4 5 6 ... 17 18

Sommario

Pagina 1 - Class D Audio Amplifier

General DescriptionThe MAX9712 mono class D audio power amplifier pro-vides class AB amplifier performance with class D effi-ciency, conserving board

Pagina 2

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier10 ______________________________________________________________________________________the

Pagina 3

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier______________________________________________________________________________________ 11Shu

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MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier12 ______________________________________________________________________________________the

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MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier______________________________________________________________________________________ 13ter

Pagina 6

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier14 ______________________________________________________________________________________IN+

Pagina 7

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier______________________________________________________________________________________ 15Pac

Pagina 8

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier16 ______________________________________________________________________________________Pac

Pagina 9

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier______________________________________________________________________________________ 17DOC

Pagina 10

MAX9712500mW, Low EMI, Filterless, Class D Audio AmplifierMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely em

Pagina 11

500mW, Low EMI, Filterless, Class D Audio Amplifier2 _______________________________________________________________________________________ABSOLUTE M

Pagina 12

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier_______________________________________________________________________________________ 3ELE

Pagina 13

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier4 _______________________________________________________________________________________Typ

Pagina 14

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier_______________________________________________________________________________________ 5030

Pagina 15

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier6 _______________________________________________________________________________________Typ

Pagina 16

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier_______________________________________________________________________________________ 7Fun

Pagina 17

MAX9712Detailed DescriptionThe MAX9712 filterless, class D audio power amplifierfeatures several improvements to switch-mode amplifiertechnology. The

Pagina 18 - BOTTOM VIEW

MAX9712500mW, Low EMI, Filterless, Class D Audio Amplifier_______________________________________________________________________________________ 9spr

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