MAX9706

3-Channel, 2.3W, Filterless Class D Amplifiers with Active Crossover

Triple Class D Amplifiers with Integrated Crossover Ideal for 2.1 Audio Systems

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Overview

Triple Class D Amplifiers Deliver 3 x 2.3W into 4Ω
Internal Active Crossover Filter with Adjustable Crossover Frequency
Low-EMI, Spread-Spectrum Modulation
Low 0.02% THD+N
High PSRR (71dB)
DirectDrive Headphone Amplifier (MAX9706)
Enhanced Click-and-Pop Suppression
Input and Output Modulator Synchronization
Low-Power Shutdown Mode
Up To 90% Efficiency
Space-Saving (6mm x 6mm x 0.8mm) 36-Pin Thin QFN Package

The MAX9706/MAX9707 combine three high-efficiency Class D amplifiers with an active crossover to provide stereo highpass outputs, and a mono lowpass output. All three channels deliver up to 2.3W at 1% THD+N per channel into 4Ω when operating from a 5V supply.

An internal active filter processes the stereo inputs (left and right) into stereo highpass and mono lowpass outputs. The crossover frequency is pin-selectable to four different frequencies to accommodate a variety of speaker configurations. The internal Class D amplifiers feature low-EMI, spread-spectrum outputs. No output filters are required.

The MAX9706 features Maxim's DirectDrive® headphone amplifier, providing ground-referenced headphone outputs without the need for bulky DC-coupling capacitors. The headphone outputs are capable of delivering 95mW per channel into 16Ω from a 3.3V supply, and are protected against ESD up to ±8kV.

The MAX9706/MAX9707 feature pin-programmable gain, synchronization inputs and outputs, and a shutdown mode that reduces supply current to less than 1µA. All amplifiers feature click-and-pop suppression circuitry. Both devices are fully specified over the -40°C to +85°C extended temperature range and are available in the thermally enhanced 36-pin (6mm x 6mm x 0.8mm) thin QFN package.

Applications