Maxim MAX9777 Manual de usuario descargar pdf

General Description

The MAX9777/MAX9778 combine a stereo 3W bridge-

tied load (BTL) audio power amplifier, stereo single-

ended (SE) headphone amplifier, headphone sensing,

and a 2:1 input multiplexer all in a tiny 28-pin thin QFN

package. These devices operate from a single 4.5V to

5.5V supply and feature an industry-leading 100dB

PSRR, allowing these devices to operate from noisy

supplies without the addition of a linear regulator. An

ultra-low 0.002% THD+N ensures clean, low-distortion

amplification of the audio signal. Click-and-pop sup-

pression minimizes audible transients on power and

shutdown cycles. Power-saving features include low

4mV V

(minimizes DC current drain through the

speakers), low 13mA supply current, and a 10µA shut-

down mode. A MUTE function allows the outputs to be

quickly enabled or disabled.

A headphone sense input detects the presence of a

headphone jack and automatically configures the

amplifiers for either speaker or headphone mode. In

speaker mode, the amplifiers can deliver up to 3W of

continuous average power into a 3Ω load. In head-

phone mode, the amplifier can deliver up to 200mW of

continuous average power into a 16Ω load. The gain of

the amplifiers is externally set, allowing maximum flexi-

bility in optimizing output levels for a given load. The

amplifiers also feature a 2:1 input multiplexer, allowing

multiple audio sources to be selected. The multiplexer

can also be used to compensate for limitations in the

frequency response of the loud speakers by selecting

an external equalizer network. The various functions are

controlled by either an I

C-compatible (MAX9777) or

simple parallel control interface (MAX9778).

The MAX9777/MAX9778 are available in a thermally

efficient 28-pin thin QFN package (5mm x 5mm x

0.8mm). These devices have thermal-overload protec-

tion (OVP) and are specified over the extended -40°C

to +85°C temperature range.

Features

♦ Industry-Leading, Ultra-High 100dB PSRR

♦ 3W BTL Stereo Speaker Amplifier

♦ 200mW Stereo Headphone Amplifier

♦ Low 0.002% THD+N

♦ Click-and-Pop Suppression

♦ ESD-Protected Outputs

♦ Low Quiescent Current: 13mA

♦ Low-Power Shutdown Mode: 10µA

♦ MUTE Function

♦ Headphone Sense Input

♦ Stereo 2:1 Input Multiplexer

♦ Optional 2-Wire, I

C-Compatible or Parallel

Interface

♦ Tiny 28-Pin Thin QFN (5mm

x 5mm x 0.8mm)

Package

MAX9777/MAX9778

Stereo 3W Audio Power Amplifiers with

Headphone Drive and Input Mux

________________________________________________________________

Maxim Integrated Products

SE/

BTL

SINGLE SUPPLY

4.5V TO 5.5V

C-

COMPATIBLE

MAX9777

LEFT IN1

LEFT IN2

RIGHT IN1

RIGHT IN2

CONTROL

Simplified Block Diagram

Ordering Information

19-0509; Rev 0; 4/06

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.

PART

CONTROL

INTERFACE

PIN-

PACKAGE

PK G

C O D E

MAX9777ETI+

C Compatible 28 Thi n QFN - E P *

T2855-6

MAX9778ETI+

Parallel

28 Thi n QFN - E P *

T2855-6

Pin Configurations and Functional Diagrams appear at end

of data sheet.

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

ing temperature range.

+Denotes lead-free package.

*EP = Exposed paddle.

Notebooks

Portable DVD Players

Tablet PCs

PC Audio Peripherals

Camcorders

Multimedia Monitor

Applications

1 2 3 4 5 6 ... 26 27

MAX9777/MAX9778 10
Headphone Drive and Input Mux 10

Indice de contenidos

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General DescriptionThe MAX9777/MAX9778 combine a stereo 3W bridge-tied load (BTL) audio power amplifier, stereo single-ended (SE) headphone amplifier,

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MAX9777/MAX9778HPFHPFMICROCONTROLLERCODECMAX9777INR2INR1INL2INL1BIAS1µF100µF0.68µF0.68µF0.68µF0.68µF0.047µF0.047µF220µF220µF27.4kΩ27.4kΩ47kΩ10kΩ10kΩ68

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MAX9777/MAX9778Stereo 3W Audio Power Amplifiers withHeadphone Drive and Input MuxMaxim cannot assume responsibility for use of any circuitry other tha

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Maxim MAX9777 Manual de usuario

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