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19-2862; Rev 1; 2/05

750mW Audio Amplifiers with Headphone Amp,

Microphone Preamp, and Input Mux

General Description

The MAX9765/MAX9766/MAX9767 family combines

speaker, headphone, and microphone amplifiers, all in

a small thin QFN package. The MAX9765 is targeted at

stereo speaker playback applications and includes a

stereo bridge-tied load (BTL) speaker amp, stereo

headphone amp, single-ended output mic amp, input

MUX, and I

2

C control. The MAX9766 is targeted at

mono speaker playback applications and includes a

mono BTL speaker amp, stereo headphone amp, differ-

ential output mic amp, input MUX, and I

2

C control. The

MAX9767 is targeted at applications that do not require

a headphone amp and includes a stereo BTL speaker

amp, differential output mic amp, and parallel control.

These devices operate from a single 2.7V to 5.5V supply.

A high 95dB PSRR allows these devices to operate from

noisy supplies without additional power conditioning. An

ultra-low 0.003% THD+N ensures clean, low distortion

amplification of the audio signal. Patented click-and-pop

suppression eliminates audible transients on power and

shutdown cycles.

In speaker mode, the amplifiers can deliver up to

750mW of continuous average power into a 4鈩?load. In

headphone mode, the amplifier can deliver up to 65mW

of continuous average power into a 16鈩?load. The gain

of the amplifiers is externally set, allowing maximum

flexibility in optimizing output levels for a given load.

The MAX9765/MAX9766 also feature a 2:1 input multi-

plexer, allowing multiple audio sources to be selected.

The various functions are controlled by either an I

2

C-

compatible (MAX9765/MAX9766) or simple parallel

control interface (MAX9767).

All devices include two low-noise microphone pre-

amps, a differential amp for internal microphones, and

a single-ended amplifier for additional external micro-

phones. A microphone bias output is provided, reduc-

ing external component count.

The MAX9765/MAX9766/MAX9767 are available in a

thermally efficient 32-pin thin QFN package (5mm

鉁?/div>

5mm

鉁?/div>

0.8mm). All devices have short-circuit and

thermal-overload protection (OVP) and are specified

over the extended -40掳C to +85掳C temperature range.

鈾?/div>

Features

750mW BTL Stereo Speaker Amplifier

65mW Stereo Headphone Amplifier

2.7V to 5.5V Single-Supply Operation

Patented Click-and-Pop Suppression

Low 0.003% THD+N

Low Quiescent Current: 13mA

Low-Power Shutdown Mode: 5碌A

MUTE Function

Headphone Sense Input

Stereo 2:1 Input Multiplexer

Optional 2-Wire, I

2

C-Compatible, or Parallel

Interface

鈾?/div>

Small 32-Pin Thin QFN (5mm

鉁?/div>

5mm

鉁?/div>

0.8mm)

Package

MAX9765/MAX9766/MAX9767

Ordering Information

PART

MAX9765ETJ

MAX9766ETJ

MAX9767ETJ

TEMP RANGE

-40

o

C to +85

o

C

-40

o

C to +85

o

C

-40

o

C to +85

o

C

PIN-PACKAGE

32 Thin QFN-EP*

*EP

= Exposed paddle.

Pin Configurations and Functional Diagrams appear at end of data

sheet.

Simplified Diagram

MUX

INL1

INL2

MUX

INR1

INR2

SPKR

RIGHT

DEVICE

CONTROL

SPKR

LEFT

HEADPHONE

Applications

PDA Audio Systems

Tablet PCs

Cell Phones

Purchase of I

2

C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associated Companies, conveys a

license under the Philips I

2

C Patent Rights to use these compo-

nents in an I

2

C system, provided that the system conforms to the

I

2

C Standard Specification defined by Philips.

CONTROL

Notebooks

Digital Cameras

MICIN-

MICIN+

AUXIN

MICBIAS

BIAS

MUX

MICOUT

MAX9765

________________________________________________________________

Maxim Integrated Products

1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

制造商
Maxim Integrated Products

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