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

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

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 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

Applications/Uses

  • 2.1 Speaker Solutions
  • Desktop PCs
  • Multimedia Monitors
  • Notebook Audio Solutions
  • Portable DVD Players
  • Table-Top LCD TVs

Description

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.

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.