AudioMAX™
I N T E G R A T E D
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
P R O D U C T S
P RODUCTION
KEY FEATURES
DESCRIPTION
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
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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 combinations 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.
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IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
WWW . Microsemi .C OM
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.
7V - 25V
Channel
1
Output Power vs. Supply Voltage
1kHz, 4Ω, THD+N=1%
IN +
IN -
FETs
Left
FETs
Right
LX1722
Stereo
Channel 2
IN +
IN -
2Ω, 4Ω, 8Ω
CLOCK
LX1711
Channel 3
Mono
FETs
IN +
IN -
2.1 Audio Amplifier
Configuration
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
LX1721 / 22
LX1721 / 22
O
Subwoofer
APPLICATIONS
PACKAGE ORDER INFO
TJ (°C)
VDD
-20 to 70
-20 to 70
7V – 15V
7V – 25V
DB
Plastic QSOP
44-Pin
LX1721CDB
LX1722CDB
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1722CDBT)
Copyright 2001
Rev. 1.1,2003-06-10
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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