General Description

The MAX9768 mono 10W Class D speaker amplifier

provides high-quality, efficient audio power with an inte-

grated volume control function.

The MAX9768 features a 64-step dual-mode (analog or

digitally programmable) volume control and mute func-

tion. The audio amplifier operates from a 4.5V to 14V

single supply and can deliver up to 10W into an 8

Ω

speaker with a 14V supply.

A selectable spread-spectrum mode reduces EMI-radiat-

ed emissions, allowing the device to pass EMC testing

with ferrite bead filters and cable lengths up to 1m. The

MAX9768 can be synchronized to an external clock,

allowing synchronization of multiple Class D amplifiers.

The MAX9768 features high 77dB PSRR, low 0.08%

THD+N, and SNR up to 97dB. Robust short-circuit and

thermal-overload protection prevent device damage

during a fault condition. The MAX9768 is available in a

24-pin thin QFN-EP (4mm x 4mm x 0.8mm) package

and is specified over the extended -40°C to +85°C tem-

perature range.

Applications

Features

♦ Patented Spread-Spectrum Modulation

♦ Meets EN55022B EMC with Ferrite Bead Filters

♦ Amplifier Operation from 4.5V to 14V Supply

♦ High 77dB PSRR

MAX9768—220ms

MAX9768B—15ms

♦ Low-Power Shutdown Mode (0.5µA)

♦ Short-Circuit and Thermal-Overload Protection

10W Mono Class D Speaker

Amplifier with Volume Control

________________________________________________________________

Maxim Integrated Products

1

19-0854; Rev 2; 11/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

Pin Configuration located at end of data sheet.

Ordering Information

Note: All devices are specified over the -40°C to +85°C oper-

ating temperature range.

+

Denotes a lead-free/RoHS-compliant package.

*

EP = Exposed pad.

PART

PIN-PACKAGE

MAX9768ETG+

24 TQFN-EP*

220

MAX9768BETG+

24 TQFN-EP*

15

MUTE

SHDN

SPEAKER

AUDIO

INPUT

FILTERLESS

CLASS D

SPEAKER

OUTPUT

ANALOG OR

CONTROL

3.3V

4.5V TO 14V

MAX9768

Simplified Block Diagram

MAX9768 EMI WITH FERRITE BEAD FILTERS

Ω LOAD)

FREQUENCY (MHz)

900

800

100 200 300

500 600

400

700

5

10

15

20

25

30

35

40

0

0

1000

OVER 20dB MARGIN

TO EN55022B LIMIT

Notebook Computers

Flat-Panel Displays

Multimedia Monitors

GPS Navigation

Systems

Security/Personal

Mobile Radio