MAX9703 Stereo/Mono Spread-Spectrum Class D Amplifiers Development Board

The MAX9703/MAX9704 mono/stereo Class D audio power amplifiers provide Class AB amplifier performance with Class D efficiency, conserving board space and eliminating the need for a bulky heatsink. Using a Class D architecture, these devices deliver up to 15W while offering up to 78% efficiency. Modulation and switching schemes render the traditional Class D output filter unnecessary. The MAX9703/MAX9704 offer 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 comprehensive click-and-pop suppression. The MAX9703/MAX9704 feature high 80dB PSRR, low 0.07% THD+N, and SNR in excess of 95dB. Short-circuit and thermal-overload protection prevent the devices from being damaged during a fault condition. The MAX9703 is available in a 32-pin TQFN (5mm x 5mm x 0.8mm) package. The MAX9704 is available in a 32-pin TQFN (7mm x 7mm x 0.8mm) package. Both devices are specified over the extended -40°C to +85°C temperature range.

• Filterless Class D Amplifier
• Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods
• Up to 78% Efficient (R_L = 8O)
• Up to 88% Efficient (R_L = 16O)
• 15W Continuous Output Power into 8O (MAX9703)
• 2x10W Continuous Output Power into 8O (MAX9704)
• 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 Packages
  • 32-Pin TQFN (5mm x 5mm x 0.8mm)-MAX9703
  • 32-Pin TQFN (7mm x 7mm x 0.8mm)-MAX9704