MAX9775(2008) 查看數據表（PDF） - Maxim Integrated

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MAX9775
(Rev.:2008)

2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier

Maxim Integrated 

19-0746; Rev 4; 8/08

2 x 1.5W, Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

General Description

The MAX9775/MAX9776 combine a high-efficiency

Class D, stereo/mono audio power amplifier with a

mono DirectDrive® receiver amplifier and a stereo

DirectDrive headphone amplifier.

Maxim’s 3rd-generation, ultra-low-EMI, Class D audio

power amplifiers provide Class AB performance with

Class D efficiency. The MAX9775/MAX9776 deliver

1.5W per channel into a 4Ω load from a 5V supply and

offer efficiencies up to 79%. Active emissions limiting

circuitry and spread-spectrum modulation greatly

reduce EMI, eliminating the need for output filtering

found in traditional Class D devices.

The MAX9775/MAX9776 utilize a fully differential archi-

tecture, a full-bridged output, and comprehensive click-

and-pop suppression. A 3D stereo enhancement

function allows the MAX9775 to widen the stereo sound

field immersing the listener in a cleaner, richer sound

experience than typically found in portable applications.

The devices utilize a flexible, user-defined mixer archi-

tecture that includes an input mixer, volume control, and

output mixer. All control is done through I2C.

The mono receiver amplifier and stereo headphone

amplifier use Maxim’s DirectDrive architecture that pro-

duces a ground-referenced output from a single supply,

eliminating the need for large DC-blocking capacitors,

saving cost, space, and component height.

The MAX9775 is available in a 36-bump WLP (3mm x

3mm) package. The MAX9776 is available in a 32-pin

TQFN (5mm x 5mm) or a 36-bump WLP (3mm x 3mm)

package. Both devices are specified over the extended

-40°C to +85°C temperature range.

Applications

Cell Phones

Portable Multimedia Players

Handheld Gaming Consoles

SINGLE SUPPLY 2.7V TO 5.5V

Features

♦ Unique Spread-Spectrum Modulation and Active

Emissions Limiting Significantly Reduces EMI

♦ 3D Stereo Enhancement (MAX9775 Only)

♦ Up to 3 Stereo Inputs

♦ 1.5W Stereo Speaker Output (4Ω, VDD = 5V)

♦ 50mW Mono Receiver/Stereo Headphone Outputs

(32Ω, VDD = 3.3V)

♦ High PSRR (68dB at 217Hz)

♦ 79% Efficiency (VDD = 3.3V, RL = 8Ω, POUT =

470mW)

♦ I2C Control—Input Configuration, Volume Control,

Output Mode

♦ Click-and-Pop Suppression

♦ Low Total Harmonic Distortion (0.03% at 1kHz)

♦ Current-Limit and Thermal Protection

♦ Available in Space-Saving, 36-Bump WLP (3mm x

3mm) and 32-Pin TQFN (5mm x 5mm) Packages

Ordering Information

PART

PIN-PACKAGE

CLASS D

AMPLIFIER

MAX9775EBX+T

36 WLP*

Stereo

MAX9776ETJ+

32 TQFN-EP**

Mono

MAX9776EBX+T

36 WLP*

Mono

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

ating temperature range.

+Denotes a lead-free/RoHS-compliant package.

*Four center bumps depopulated.

**EP = Exposed pad.

Pin Configurations appear at end of data sheet.

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

Simplified Block Diagrams

SINGLE SUPPLY 2.7V TO 5.5V

GAIN

CONTROL

MIXER/

MUX

3D

SOUND

CONTROL

I2C

INTERFACE

GAIN

CONTROL

MIXER/

MUX

I2C

INTERFACE

MAX9775

MAX9776

________________________________________________________________ Maxim Integrated Products 1

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.

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