MAX9726 Maxim Integrated Products, MAX9726 Datasheet

MAX9726

Manufacturer Part Number

MAX9726

Description

Headphone Amplifier

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX9726.pdf (26 pages)

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The MAX9726 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 MAX9726 operates from a sin-

gle 2.7V to 5.5V power supply and includes features that

reduce external component count, system cost, board

space, and offer improved audio reproduction. High

85dB PSRR makes the MAX9726 ideal for direct connec-

tion to a battery-powered supply and eliminates the need

for a dedicated LDO. The MAX9726 features Maxim’s

industry-leading click-and-pop suppression circuitry,

which reduces/eliminates audible transients during

power-up and power-down.

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 105mW into a 32Ω load and feature low

0.02% THD+N.

The BassMax feature boosts the bass response of the

amplifier, improving audio reproduction when using inex-

pensive headphones. The integrated volume control fea-

tures 64 discrete volume levels, eliminating the need for

an external potentiometer. External resistors set the

MAX9726’s overall gain allowing for custom gain settings.

BassMax and the volume control are enabled through the

trolled through the hardware or software interface.

The MAX9726 consumes only 5.5mA of supply current,

provides short-circuit and thermal-overload protection,

and is specified over the -40°C to +85°C extended tem-

perature range. The MAX9726 is available in a tiny

(2mm x 2.5mm x 0.62mm) 20-bump chip-scale pack-

age (UCSP™) and a 20-pin TQFN package (4mm x

4mm x 0.75mm).

19-0627; Rev 0; 9/06

Cell Phones

MP3/PMP Players

Flat-Panel TVs

†

SMBus is a trademark of Intel Corp.

UCSP is a trademark of Maxim Integrated Products, Inc.

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.

U.S. Patent # 7,061,327

C/SMBus

™

-compatible interface. Shutdown can be con-

________________________________________________________________ Maxim Integrated Products

BassMax, I

DirectDrive, Headphone Amplifier with

General Description

Automotive Rear-Seat

Entertainment (RSE)

Portable CD/DVD/MD

Players

Applications

C, Volume and Gain Control

†

♦ 105mW DirectDrive Headphone Amplifier

♦ 2.7V to 5.5V Single-Supply Operation

♦ Integrated 64-Level Volume Control

♦ High 85dB PSRR at 1kHz

♦ Software-Enabled Bass Boost (BassMax)

♦ Industry-Leading Click-and-Pop Suppression

♦ ±7.5kV HBM ESD-Protected Headphone Outputs

♦ Short-Circuit and Thermal-Overload Protection

♦ Low-Power Shutdown Mode (8µA)

♦ Low 0.02% THD+N

♦ I

♦ Available in Space-Saving, Thermally Efficient

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

range.

+Denotes lead-free package.

*Future product—contact factory for availability.

**EP = Exposed pad.

Pin Configurations appear at end of data sheet.

MAX9726AEBP+T*

MAX9726AETP+

MAX9726BEBP+T*

MAX9726BETP+

Eliminates Bulky DC-Blocking Capacitors

Packages

C/SMBus-Compatible Interface

20-Bump UCSP (2mm x 2.5mm x 0.62mm)

20-Pin TQFN (4mm x 4mm x 0.75mm)

PART

Simplified Block Diagram

SCL

SDA

FBL

INL

INR

FBR

INTERFACE

PIN-PACKAGE

20 UCSP-20

20 TQFN-EP**

20 UCSP-20

20 TQFN-EP**

2.7V TO 5.5V SUPPLY

Ordering Information

CONTROL

VOLUME

MAX9726

OUTR

OUTL

ADDRESS

BML

BMR

1001100

1001101

SLAVE

BassMax

Features

T2044-3

CODE

B20-1

PKG

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