max9746 Maxim Integrated Products, Inc., max9746 Datasheet

max9746

Manufacturer Part Number

max9746

Description

Max9746 1.2w, Low-emi, Filterless, Class D Audio Amplifier

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX9746.pdf (16 pages)

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The MAX9746 mono Class D audio power amplifier pro-

vides Class AB amplifier performance with Class D effi-

ciency, conserving board space and extending battery

life. The MAX9746 is designed specifically for systems

using 1.8V logic interface. Using a Class D architecture,

the MAX9746 delivers 1.2W into an 8Ω load while offer-

ing efficiencies near 90%. A patented, low-EMI modula-

tion scheme renders the traditional Class D output filter

unnecessary.

The MAX9746 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 MAX9746 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

MAX9746s 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 of the MAX9746 is set internally

further reducing external component count.

The MAX9746 features high 72dB PSRR, a low 0.1%

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

thermal-overload protection prevent the device from

damage during a fault condition. The MAX9746 is avail-

able in a 12-bump UCSP™ (1.5mm

package. The MAX9746 is specified over the extended

-40°C to +85°C temperature range.

19-0515; Rev 0; 5/06

UCSP is a trademark of Maxim Integrated Products, Inc.

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

DIFFERENTIAL

AUDIO INPUT

INPUT

SYNC

________________________________________________________________ Maxim Integrated Products

OSCILLATOR

General Description

AND H-BRIDGE

MODULATOR

Block Diagram

MP3 Players

Portable Audio

MAX9746

Applications

2mm

0.6mm)

1.2W, Low-EMI, Filterless,

Class D Audio Amplifier

♦ Filterless Amplifier Passes FCC Radiated

♦ Unique Spread-Spectrum Mode Offers 5dB

♦ Optional External SYNC Input

♦ Simple Master-Slave Setup for Stereo Operation

♦ 88% Efficiency

♦ 1.2W into 8Ω

♦ Low 0.1% THD+N

♦ High PSRR (72dB at 217Hz)

♦ Integrated Click-and-Pop Suppression

♦ 1.8V Logic-Compatible

♦ Low Quiescent Current (4mA)

♦ Low-Power Shutdown Mode (0.1µA)

♦ Short-Circuit and Thermal-Overload Protection

♦ Available in Thermally Efficient, Space-Saving

+Denotes lead-free package.

MAX9746BEBC+T

Emissions Standards with 100mm of Cable

Emissions Improvement Over Conventional

Methods

12-Bump UCSP Package (1.5mm x 2mm x 0.6mm)

(BUMP SIDE DOWN)

PART

TOP VIEW

IN+

IN-

TEMP RANGE

-40

Ordering Information

SHDN

GND

MAX9746

C to +85

UCSP

Pin Configuration

PGND

SYNC

OUT+

OUT-

PIN-PACKAGE

12 UCSP-12

Features

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