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Low RF Susceptibility Mono 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

Applications/Uses

Simplified Block Diagram

Technical Docs

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Key Features

  • Low Emissions, Filterless Class D Amplifier Achieves Better than 10dB Margin Under EN55022 Class B Limits
  • Low RF Susceptibility Design Rejects TDMA Noise from GSM Radios
  • Input Mixer with User-Defined Input Mode
  • 725mW Speaker Output (RSPK = 8Ω, PVDD = 3.7V)
  • 53mW Headphone Output (RHP = 16Ω, VDD = 3.7V)
  • Low 0.05% THD+N at 1kHz (Class D Power Amplifier)
  • Low 0.016% THD+N at 1kHz (Headphone Amplifier)
  • 87% Efficiency (RSPK = 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
  • Click-and-Pop Suppression
  • Current-Limit and Thermal Protection
  • Available in a Space-Saving, 2.5mm x 2.0mm WLP Package

Applications/Uses

  • Cell Phones
  • Portable Multimedia Players

Description

The MAX9877 combines a high-efficiency Class D audio power amplifier with a stereo Class AB capacitor-less DirectDrive® headphone amplifier. Maxim's 3rd generation, filterless Class D amplifier with active emissions limiting technology provides Class AB performance with Class D efficiency.

The MAX9877 delivers up to 725mW from a 3.7V supply into an 8Ω load with 87% efficiency to extend battery life. The filterless modulation scheme combined with active emissions limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices.

The stereo Class AB headphone amplifier in the MAX9877 uses Maxim's DirectDrive architecture, that 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 MAX9877.

The MAX9877 is available in a thermally efficient, space-saving 20-bump WLP package.

Simplified Block Diagram

MAX9877: Simplified Block Diagram MAX9877: 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 .