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MAX9741
12W+12W, Low-EMI, Spread-Spectrum, Stereo, Class D Amplifier


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 1.1MB)
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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, the MAX9741 delivers 12W continuous output power into 8Ω 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 fixed-frequency 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 -40°C to +85°C temperature range.

An evaluation kit is available:  MAX9741EVKIT  

Key Features   Applications/Uses
  • Low EMI
  • Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods
  • Up to 88% Efficient into 16Ω
  • 12W+12W Continuous Output Power into 8Ω
  • 15W+15W Continuous Output Power into 16Ω
  • 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 (0.2µA)
  • Short-Circuit and Thermal-Overload Protection
  • Available in Thermally Efficient, Space-Saving 56-Pin TQFN (8mm x 8mm x 0.8mm) Package
 

Key Specifications:  Speaker Amplifiers
Part Number Class Spkr. Amp. VCC
(V)
Spkr. Amp. VCC
(V)
Spkr. Amp. ICC
(mA)
POUT into 4Ω @ 10% THD+N
(W)
POUT into 8Ω @ 10% THD+N
(W)
PSRR
(dB)
Spkr. Amp. Ext. Gain Spkr. Amp. Fxd. Gain
(V/V)
Spkr. Amp. Fxd. Gain
(V/V)
Features Channels Price
min max typ min min min min max See Notes
MAX9741  D 10 25 26 8.5 12 70 No 4.5 30.2 Differential Inputs 2 $2.50 @1k
See All Speaker Amplifiers (30)

Diagram
MAX9741: Simplilfied Block Diagram
Simplilfied Block Diagram

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    Document Ref.: 19-3887; Rev 0; 2006-02-24
    This page last modified: 2008-10-15


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