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500mW, Low EMI, Filterless, Class D Audio Amplifier

500mW, Low-EMI, Filterless, Class D Audio Amplifier Ideal for Portable Applications

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Filterless Amplifier Passes FCC Radiated Emissions Standards with 100mm of Cable
  • Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods
  • Optional External SYNC Input
  • Simple Master-Slave Setup for Stereo Operation
  • 85% Efficiency
  • Up to 500mW into 8Ω
  • Low 0.01% THD+N
  • High PSRR (72dB at 217Hz)
  • Integrated Click-and-Pop Suppression
  • Low Quiescent Current (4mA)
  • Low-Power Shutdown Mode (0.1µA)
  • Short-Circuit and Thermal-Overload Protection
  • Available in Thermally Efficient, Space-Saving Packages
    • 10-Pin TDFN (3mm x 3mm x 0.8mm)
    • 10-Pin µMAX
    • 12-Bump UCSP (1.5mm x 2mm x 0.6mm)

Applications/Uses

  • Cell Phones
  • MP3 Players
  • PDAs
  • Portable Audio

Description

The MAX9712 mono class D audio power amplifier provides class AB amplifier performance with class D efficiency, conserving board space, and extending battery life. Using a class D architecture, the MAX9712 delivers up to 500mW into an 8Ω load while offering efficiencies above 85%. A low EMI modulation scheme renders the traditional class D output filter unnecessary.

The MAX9712 offers two modulation schemes: a fixed-frequency (FFM) mode, and a spread-spectrum (SSM) mode that reduces EMI-radiated emissions due to the modulation frequency. Furthermore, the MAX9712 oscillator can be synchronized to an external clock through the SYNC input, allowing the switching frequency to be user defined. The SYNC input also allows multiple MAX9712s to be cascaded and frequency locked, minimizing interference due to clock intermodulation. The device utilizes a fully differential architecture, a fullbridged output, and comprehensive click-and-pop suppression. The gain is internally set to +4V/V, further reducing external component count.

The MAX9712 features high 72dB PSRR, a low 0.01% THD+N, and SNR in excess of 90dB. Short-circuit and thermal-overload protection prevent the device from damage during a fault condition. The MAX9712 is available in 10-pin TDFN (3mm x 3mm x 0.8mm), 10-pin µMAX®, and 12-bump UCSP™ (1.5mm x 2mm x 0.6mm) packages. The MAX9712 is specified over the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX9712: Functional Diagram MAX9712: Functional 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 .

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.