Microsemi

Linfinity Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

Copyright

 2001

Rev. 1.1,2003-06-10

AudioMAX™

LX1721 / 1722

Class-D Stereo Power Amplifier Controller

I N T E GRA T ED

PR ODUC T S

DESCRIPTION

The LX1721/1722 is a monolithic high

performance Class-D stereo controller IC

designed for high efficiency or space

constrained audio requirements such as

portable or battery operated products,

automotive amplifiers, and multi-channel

multimedia computer and video game

applications.

This high frequency, full

audio

bandwidth

switching

power

amplifier controller offers dramatically

improved performance over Linfinity’s

previous generation amplifier products.

Enhancements include higher output

power, better SNR, lower noise floor, and

reduced THD.

Combined with output

power MOSFET’s and an output filter, the

LX1721/1722 is a complete Class-D audio

solution.

A complete audio amplifier module is

available to quickly evaluate the LX1721

or LX1722 stereo controller.

Simply

connect the amplifier to the power source,

audio signal, and speakers.

Reference

designs support a variety of requirements

including

multi

channel

systems,

subwoofers, satellite / subwoofer com-

binations and various speaker loads (2Ω,

4Ω, 8Ω). The versatile amplifier solution

can easily be adjusted for frequency

response, optimized for efficiency and

performance, or designed to minimize

PCB area and component count.

The

LX1721/1722 is available in a space

saving 44-pin QSOP package.

(Continued Next Page)

IMPORTANT:

For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

PRODUCT H I GHLIGHT

LX1722

Stereo

FETs

FETs

LX1711

Mono

FETs

IN +

IN -

IN +

IN -

IN +

IN -

CLOCK

Left

Right

Subwoofer

2

Ω, 4Ω, 8Ω

Channel

1

Channel 2

Channel 3

7V - 25V

2.1 Audio Amplifier

Configuration

Output Power vs. Supply Voltage

1kHz, 4

Ω, THD+N=1%

KEY FEATUR ES

Integrated Switching Class-D

Stereo Controller IC

Full 20Hz-20kHz Audio

Bandwidth

High Fidelity (LX1721) Or

High Power (LX1722)

Versions Available

Single Supply Operation

THD+N <0.06% Typical

(1Wrms, 1kHz, 4Ω)

Maximum Efficiency 80%-

85%

Output Power >60Wrms per

Channel (LX1722, 4Ω, 1%

THD+N)

PSRR –70dB Typical

Differential Input To Minimize

Noise Effects

Supports Multi-Channel

Systems

Complete LXE1721or

LXE1722 Amplifier Evaluation

Module Available

44-Pin QSOP Package

APPLICATIONS

Multimedia Speakers

Surround Sound Game

Systems

Notebook Computers

Desktop Computers

Automotive Amplifiers And

Head units

Battery Operated Equipment

(Megaphone, Public Address

System)

Portable Audio (Boom Box)

Wireless Speakers

High Power Subwoofer

Automotive Audio Systems

Home Theatre

PACKAGE ORDER INFO

DB

Plastic QSOP

44-Pin

-20 to 70

7V – 15V

LX1721CDB

-20 to 70

7V – 25V

LX1722CDB

Note: Available in Tape & Reel.

Append the letter “T” to the part number. (i.e. LX1722CDBT)