Features: Integrated Switching Class-D Stereo Controller IC
Full 20Hz-20kHz AudioBandwidth
High Fidelity (LX1721) Or High Power (LX1722)
Versions Available Single Supply OperationTHD+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 PackageApplicationMultimedia 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 TheatrePinout
SpecificationsSupply Voltage (PVDD, VDD) ...................................................-0.3V to 30V
SLEEP , STATUS, R/LFBK+, R/LFBK- ............................................-0.3V to VDD +0.3V
R/LISN ........................................................................................PVDD 2 to PVDD to +0.3V
RPWM, CPWM, R/LMUTE..............................................................-0.3V to VREF +0.3V
R/LIN+, R/LIN-, R/LAMPOUT.......................................................... -0.3V to VREF +0.3V
R/LEAIN, R/LEAOUT, R/LFAOUT.......................................................-0.3V to VREF + 0.3V
CLOCK ..........................................................................................-0.3V to CN +0.3V
Operating Junction Temperature Plastic..........................................125°C
Storage Temperature Range ..........................................................°C to 150°C
Lead Temperature (Soldering, 10 seconds) ..............................300°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into negative out of the
specified terminal.
DescriptionThe LX1721/LX1722 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
A complete audio amplifier module 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 frequencyresponse, 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)
LX1722 Data Sheet
