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1.3W, Filterless, Stereo Class D Audio Power Amplifier

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Spread-Spectrum Modulation Lowers Radiated Emissions
  • Single-Supply Operation (2.5V to 5.5V)
  • 1.3W Stereo Output (8Ω, VDD = 5V, THD+N = 1%)
  • No LC Output Filter Required
  • 87% Efficiency (RL = 8Ω, POUT = 1000mW)
  • Less Than 0.1% THD+N
  • High 80dB PSRR
  • Fully Differential Inputs
  • Integrated Click-and-Pop Suppression
  • Typical Low Quiescent Current (9mA)
  • Typical Low-Power Shutdown Mode (0.1µA)
  • Short-Circuit and Thermal-Overload Protection
  • Available in Thermally Efficient, Space-Saving Packages
    • 24-Pin Thin QFN-EP (4mm x 4mm x 0.8mm)
    • 20-Bump UCSP (2mm x 2.5mm x 0.6mm)

Applications/Uses

  • Automotive Multimedia
  • Cell Phones
  • Docking Stations
  • Handheld Gaming Consoles
  • MP3 Player
  • Multimedia Phones
  • PDA Phone
  • PMP Player
  • Smartphones

Description

The MAX9701 stereo Class D audio power amplifier provides Class AB amplifier audio performance with the benefits of Class D efficiency, eliminating the need for a heatsink while extending battery life. The MAX9701 delivers up to 1.3W per channel into an 8Ω load while offering 87% efficiency. Maxim's next-generation, low-EMI modulation scheme allows the amplifier to operate without an external LC filter while still meeting FCC EMI emission levels.

The MAX9701 offers two modulation schemes: a fixed-frequency (FFM) mode, and a spread-spectrum (SSM) mode that reduces EMI-radiated emissions. The MAX9701 oscillator can be synchronized to an external clock through the SYNC input, allowing synchronization of multiple Maxim Class D amplifiers. The sync output (SYNC_OUT) can be used for a master-slave application where more channels are required. The MAX9701 features a fully differential architecture, a full bridge-tied load (BTL) output, and comprehensive click-and-pop suppression. The device features internally set gains of 0dB, 6dB, 12dB, and 18dB selected through two gain-select inputs, further reducing external component count.

The MAX9701 features high 80dB PSRR, less than 0.1% THD+N, and SNR in excess of 88dB. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition. The MAX9701 is available in 24-pin thin QFN-EP (4mm x 4mm x 0.8mm) and 20-bump UCSP™ (2mm x 2.5mm x 0.6mm) packages. The MAX9701 is specified over the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX9701: Block Diagram MAX9701: 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 .