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| XX-XXXX; Rev 0; 10/05 12W+12W, Filterless, Spread-Spectrum, Stereo, Class D Amplifier General Description The MAX9741 stereo Class D audio power amplifier provides Class AB amplifier performance with Class D efficiency, conserving board space and eliminating the need for a bulky heatsink. Using a Class D architecture, it delivers 12W continuous output power into 8 loads. Proprietary and patent-protected modulation and switching schemes render the traditional Class D EMI suppression output filter unnecessary. The MAX9741 offers two modulation schemes: a fixedfrequency mode (FFM), and a spread-spectrum mode (SSM) that reduces EMI-radiated emissions due to the modulation frequency. The device utilizes a fully differential architecture, a full bridged output, and offers comprehensive click-and-pop suppression. The MAX9741 features high 80dB PSRR, low 0.07% THD+N, and SNR in excess of 100dB. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition. The MAX9741 is available in a 56-pin TQFN (8mm x 8mm x 0.8mm) package. The MAX9741 is specified over the extended -40C to +85C temperature range. Filterless Class D Amplifier Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods Up to 88% Efficient into 16 12W+12W Continuous Output Power into 8 15W+15W Continous Output Power into 16 Low 0.07% THD+N High PSRR (80dB at 1kHz) 10V to 25V Single-Supply Operation Differential Inputs Minimize Common-Mode Noise Pin-Selectable Gain Reduces Component Count Industry-Leading Click-and-Pop Suppression Low Quiescent Current (24mA) Low-Power Shutdown Mode (0.2A) Short-Circuit and Thermal-Overload Protection Available in Thermally Efficient, Space-Saving 56-Pin TQFN (8mm x 8mm x 0.8mm) Package Features MAX9741 Applications LCD TVs LCD Monitors Desktop PCs LCD Projectors Hands-Free Car Phone Adaptors Automotive Ordering Information PART MAX9741ETN+ TEMP RANGE -40C to +85C PIN-PACKAGE 56 TQFN-EP* PKG CODE T5688-3 +Denotes lead-free package. *EP = Exposed paddle. Simplified Block Diagram INR+ DIFFERENTIAL AUDIO INPUTS ELIMINATE NOISE PICKUP INRINL+ INLGAIN CONTROL G1 G2 PROGRAMMABLE SWITCHING FREQUENCY 2 OUTPUT PROTECTION OUTR+ OUTROUTL+ OUTLFILTERLESS CLASS D AMPLIFIERS DRIVE 2 X 13W INTO 8 LOADS CLASS D MODULATOR FS1, FS2 MAX9741 Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 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. |
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