MAX9879 查看數據表（PDF） - Maxim Integrated

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MAX9879

Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier

Maxim Integrated 

EVALUATION KIT AVAILABLE

MAX9879

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

General Description

The MAX9879 combines a high-efficiency stereo Class D

audio power amplifier with a stereo capacitor-less

DirectDrive® headphone amplifier. Maxim’s filterless class

D amplifiers with active emissions limiting technology pro-

vide Class AB performance with Class D efficiency.

The Class D power amplifier delivers up to 715mW from

a 3.7V supply into an 8Ω load with 88% efficiency to

extend battery life. The filterless modulation scheme

combined with active emission limiting circuitry and

spread-spectrum modulation greatly reduces EMI while

eliminating the need for output filtering used in tradition-

al Class D devices.

The headphone amplifier delivers up to 58mW from

a 3.7V supply into a 16Ω load. Maxim’s DirectDrive

architecture produces a ground-referenced output from

a single supply, eliminating the need for large DC-

blocking capacitors, saving cost, space and compo-

nent height.

The device utilizes a user-defined input architecture,

three preamplifier gain settings, an input mixer, volume

control, comprehensive click-and-pop suppression, and

I2C control. A bypass mode feature disables the integrat-

ed Class D amplifier and utilizes an internal DPST switch

to allow an external amplifier to drive the speaker that is

connected at the outputs of the MAX9879.

The MAX9879 is available in a thermally efficient,

space-saving 30-bump UCSP™ package.

Applications

Cell Phones

Portable Multimedia Players

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

UCSP is a trademark of Maxim Integrated Products, Inc.

Simplified Block Diagram

SINGLE SUPPLY

2.7V TO 5.5V

PREAMPLIFIER

VOLUME

CONTROL

MIXER

I2C

INTERFACE

VOLUME

CONTROL

MAX9879

BYPASS

Features

o Better than 9dB Margin Under EN 55022 Class B

Limits with No Filter Components

o Low RF Susceptibility Design Rejects TDMA

Noise from GSM Radios

o Input Mixer with User Defined Input Mode

o Stereo 715mW Speaker Output (RL = 8Ω,

VDD = 3.7V)

o Stereo 58mW Headphone Output (16Ω,

VDD = 3.7V)

o Low 0.04% THD+N at 1kHz (Class D Power

Amplifier)

o Low 0.018% THD+N at 1kHz (Headphone

Amplifier)

o 88% Efficiency (RL = 8Ω, POUT = 750mW)

o 1.6Ω Analog Switch for Speaker Amplifier Bypass

o High Speaker Amplifier PSRR (72dB at 217Hz)

o High Headphone Amplifier PSRR (84dB at 217Hz)

o I2C Control

o Hardware and Software Shutdown Mode

o Ultra-Low Click and Pop

o Robust Design with Current and Thermal

Protection

o Available in Space-Saving Package

5x6 UCSP (2.5mm x 3mm)

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX9879ERV+

-40°C to +85°C 30 UCSP (5x6)

+Denotes a lead(Pb)-free/RoHS-compliant package.

Pin Configuration

TOP VIEW

(BUMP SIDE DOWN)

1

2

3

4

5

6

A

C1P OUTL- PVDDL OUTL+ PGNDR OUTR-

B

C1N RXIN- PGNDL RXIN+ PGNDR PVDDR

C

VSS GND GND GND GND OUTR+

D

HPL BIAS INB1 INA1 SCL SDA

E

HPR

VDD

INB2 INA2 SHDN VCCIO

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-4436; Rev 1; 4/13

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