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MAX9723
(Rev.:2005)

Stereo DirectDrive Headphone Amplifier with BassMax, Volume Control, and I2C

Maxim Integrated 

19-3509; Rev 1; 11/05

Stereo DirectDrive Headphone Amplifier with

BassMax, Volume Control, and I2C

General Description

The MAX9723 stereo DirectDrive™ headphone amplifier

with BassMax and volume control is ideal for portable

audio applications where space is at a premium and per-

formance is essential. The MAX9723 operates from a sin-

gle 1.8V to 3.6V power supply and includes features that

reduce external component count, system cost, board

space, and improves audio reproduction.

The headphone amplifier uses Maxim’s patented

DirectDrive architecture that produces a ground-refer-

enced output from a single supply, eliminating the need

for large DC-blocking capacitors. The headphone ampli-

fiers deliver 62mW into a 16Ω load, feature low 0.006%

THD+N, and high 90dB PSRR. The MAX9723 features

Maxim’s industry-leading click-and-pop suppression.

The BassMax feature boosts the bass response of the

amplifier, improving audio reproduction when using

inexpensive headphones. The integrated volume con-

trol features 32 discrete volume levels, eliminating the

need for an external potentiometer. BassMax and the

volume control are enabled through the I2C*/SMBus™-

compatible interface. Shutdown is controlled through

either the hardware or software interfaces.

The MAX9723 consumes only 3.7mA of supply current

at 1.8V, provides short-circuit and thermal-overload

protection, and is fully specified over the extended

-40°C to +85°C temperature range. The MAX9723 is

available in a tiny (2mm x 2mm x 0.62mm) 16-bump

chip-scale package (UCSP™) or 16-pin thin QFN (4mm

x 4mm x 0.8mm) package.

Applications

PDA Audio

Portable CD Players

Mini Disc Players

Automotive Multimedia

MP3-Enabled Cellular

Phones

MP3 Players

Selector Guide

PART

MAX9723A

MAX9723B

MAX9723C

MAX9723D

SLAVE ADDRESS

1001100

1001101

1001100

1001101

MAXIMUM GAIN (dB)

0

0

+6

+6

*Purchase of I2C components from Maxim Integrated Products,

Inc. or one of its sublicensed Associated Companies, conveys

a license under the Philips I2C Patent Rights to use these com-

ponents in an I2C system, provided that the system conforms

to the I2C Standard Specification as defined by Philips.

SMBus is a trademark of Intel Corp.

UCSP is a trademark of Maxim Integrated Products, Inc.

Features

♦ 62mW, DirectDrive Headphone Amplifier

Eliminates Bulky DC-Blocking Capacitors

♦ 1.8V to 3.6V Single-Supply Operation

♦ Integrated 32-Level Volume Control

♦ High 90dB PSRR at 1kHz

♦ Low 0.006% THD+N

♦ Industry-Leading Click-and-Pop Suppression

♦ ±8kV HBM ESD-Protected Headphone Outputs

♦ Short-Circuit and Thermal-Overload Protection

♦ Low-Power Shutdown Mode (5µA)

♦ Software-Enabled Bass Boost (BassMax)

♦ I2C/SMBus-Compatible Interface

♦ Available in Space-Saving, Thermally Efficient

Packages:

16-Bump UCSP (2mm x 2mm x 0.62mm)

16-Pin Thin QFN (4mm x 4mm x 0.8mm)

Ordering Information

PART**

PIN-

TEMP RANGE PACKAGE

PKG

CODE

MAX9723_EBE-T* -40°C to +85°C 16 UCSP-16 B16-1

MAX9723_ETE+ -40°C to +85°C 16 TQFN

T1644-4

**Replace the ‘_’ with the one-letter code that denotes the

slave address and maximum programmable gain. See the

Selector Guide.

+Denotes lead-free package.

*Future product—contact factory for availability.

Pin Configurations appear at end of data sheet.

Block Diagram

1.8V TO 3.6V SUPPLY

SCL

SDA I2C INTERFACE

BBL

Σ

OUTL

BassMax

INL

VOLUME

INR CONTROL

MAX9723

OUTR

Σ

BBR

BassMax

________________________________________________________________ Maxim Integrated Products 1

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.

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