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MAX9875

Low RF Susceptibility, Mono Audio Subsystem with DirectDrive Headphone Amplifier

Maxim Integrated 

19-4536; Rev 0; 3/09

EVAALVUAAILTAIOBNLEKIT

Low RF Susceptibility, Mono Audio

Subsystem with DirectDrive Headphone Amplifier

General Description

The MAX9875 combines a high-efficiency Class D

audio power amplifier with a stereo Class AB capacitor-

less DirectDrive® headphone amplifier. Maxim’s 3rd

generation, filterless Class D amplifier with active emis-

sions limiting technology provides Class AB perfor-

mance with Class D efficiency.

The MAX9875 delivers up to 725mW from a 3.7V supply

into an 8Ω load with 87% efficiency to extend battery life.

The filterless modulation scheme combined with active

emissions limiting circuitry and spread-spectrum modu-

lation greatly reduces EMI while eliminating the need for

output filtering used in traditional Class D devices.

The stereo Class AB headphone amplifier in the

MAX9875 uses Maxim’s DirectDrive architecture, that

produces a ground-referenced output from a single sup-

ply, eliminating the need for large DC-blocking capaci-

tors, saving cost, space, and component 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.

The MAX9875 is available in a thermally efficient,

space-saving 20-bump WLP package.

Applications

Cell Phones

Portable Multimedia Players

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

Simplified Block Diagram

SINGLE SUPPLY

2.7V TO 5.25V

Features

♦ Low Emissions, Filterless Class D Amplifier

Achieves Better than 10dB Margin Under EN55022

Class B Limits

♦ Low RF Susceptibility Design Rejects TDMA

Noise from GSM Radios

♦ Input Mixer with User-Defined Input Mode

♦ 725mW Speaker Output (RSPK = 8Ω, PVDD = 3.7V)

♦ 53mW Headphone Output (RHP = 16Ω, VDD = 3.7V)

♦ Low 0.05% THD+N at 1kHz (Class D Power

Amplifier)

♦ Low 0.016% THD+N at 1kHz (Headphone

Amplifier)

♦ 87% Efficiency (RSPK = 8Ω, POUT = 750mW)

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

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

♦ I2C Control

♦ Hardware and Software Shutdown Mode

♦ Click-and-Pop Suppression

♦ Current-Limit and Thermal Protection

♦ Available in a Space-Saving, 2.5mm x 2.0mm WLP

Package

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX9875ERP+TG45 -40°C to +85°C

20 WLP (5x4)

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

T = Tape and reel.

G45 indicates protective die coating.

Pin Configuration

TOP VIEW

(BUMP SIDE DOWN)

1

2

3

4

5

PREAMPLIFIER

VOLUME

CONTROL

MIXER/MUX

I2C

INTERFACE

VOLUME

CONTROL

MAX9875

A

HPR

HPL

VSS

C1N

C1P

B

VDD BIAS SDA N.C. OUT+

C

INB2 INB1 SCL PGND PVDD

D

INA2 INA1 GND N.C. OUT-

WLP

________________________________________________________________ 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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