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MAX9723

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

Maxim Integrated 

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MAX9723

EVALUATION KIT AVAILABLE

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

performance is essential. The MAX9723 operates from a

single 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 DirectDrive archi-

tecture that produces a ground-referenced output from a

single supply, eliminating the need for large DC-blocking

capacitors. The headphone amplifiers 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 control

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 hard-

ware 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 tem-

perature 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

●● 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

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

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**

MAX9723_EBE-T*

MAX9723_ETE+

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

PIN-

PACKAGE

16 UCSP-16

16 TQFN

PKG

CODE

B16-1

T1644-4

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

address and maximum programmable gain. See the Selector

Guide.

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

*Future product—contact factory for availability.

Pin Configurations appears at end of data sheet.

Block Diagram

1.8V TO 3.6V SUPPLY

SCL

SDA I2C INTERFACE

BBL

∑

OUTL

BassMax

INL

VOLUME

INR CONTROL

MAX9723

OUTR

∑

BBR

BassMax

19-3509; Rev 4; 7/18

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