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Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier

Industry's Smallest Size, Highest D-Class Output Power and Best-in-Class RF Susceptibility (TDMA Noise Free)

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Better than 9dB Margin Under EN 55022 Class B Limits with No Filter Components
  • Low RF Susceptibility Design Rejects TDMA Noise from GSM Radios
  • Input Mixer with User Defined Input Mode
  • Stereo 715mW Speaker Output (RL = 8Ω, VDD = 3.7V)
  • Stereo 58mW Headphone Output (16Ω, VDD = 3.7V)
  • Low 0.04% THD+N at 1kHz (Class D Power Amplifier)
  • Low 0.018% THD+N at 1kHz (Headphone Amplifier)
  • 88% Efficiency (RL = 8Ω, POUT = 750mW)
  • 1.6Ω Analog Switch for Speaker Amplifier Bypass
  • High Speaker Amplifier PSRR (72dB at 217Hz)
  • High Headphone Amplifier PSRR (84dB at 217Hz)
  • I²C Control
  • Hardware and Software Shutdown Mode
  • Ultra-Low Click and Pop
  • Robust Design with Current and Thermal Protection
  • Available in Space-Saving Package
    • 5x6 UCSP (2.5mm x 3mm)

Applications/Uses

  • Cell Phones
  • Portable Multimedia Players

Description

The MAX9879 combines a high-efficiency stereo Class D audio power amplifier with a stereo capacitor-less DirectDrive® headphone amplifier. Maxim's filterless class D amplifiers with active emissions limiting technology provide Class AB performance with Class D efficiency.

The Class D power amplifier delivers up to 715mW from a 3.7V supply into an 8Ω load with 88% efficiency to extend battery life. The filterless modulation scheme combined with active emission limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices.

The headphone amplifier delivers up to 58mW from a 3.7V supply into a 16Ω load. Maxim's DirectDrive architecture produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, space, and component height.

The device utilizes a user-defined input architecture, three preamplifier gain settings, an input mixer, volume control, comprehensive click-and-pop suppression, and I²C control. A bypass mode feature disables the integrated Class D amplifier and utilizes an internal DPST switch to allow an external amplifier to drive the speaker that is connected at the outputs of the MAX9879.

The MAX9879 is available in a thermally efficient, space-saving 30-bump UCSP package.

Simplified Block Diagram

MAX9879: Simplified Block Diagram MAX9879: Simplified Block Diagram Zoom icon

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 .