Top

2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier

Improved 3D Stereo Sound Enhancement Over Competition, 3-Input Mixer/MUX Eliminates Need for External Switch, Integrated DirectDrive Amplifiers Save Board Space and Cost

Product Details

Key Features

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 .

Key Features

  • Unique Spread-Spectrum Modulation and Active Emissions Limiting Significantly Reduces EMI
  • 3D Stereo Enhancement (MAX9775 Only)
  • Up to 3 Stereo Inputs
  • 1.5W Stereo Speaker Output (4Ω, VDD = 5V)
  • 50mW Mono Receiver/Stereo Headphone Outputs (32Ω, VDD = 3.3V)
  • High PSRR (68dB at 217Hz)
  • 79% Efficiency (VDD = 3.3V, RL = 8Ω, POUT = 470mW)
  • I²C Control—Input Configuration, Volume Control, Output Mode
  • Click-and-Pop Suppression
  • Low Total Harmonic Distortion (0.03% at 1kHz)
  • Current-Limit and Thermal Protection
  • Available in Space-Saving, 36-Bump WLP (3mm x 3mm) and 32-Pin TQFN (5mm x 5mm) Packages

Applications/Uses

  • Cell Phones—Mid and High Tier
  • Handheld Gaming Consoles
  • Portable Multimedia Players

Description

The MAX9775/MAX9776 combine a high-efficiency Class D, stereo/mono audio power amplifier with a mono DirectDrive® receiver amplifier and a stereo DirectDrive headphone amplifier.

Maxim's 3rd-generation, ultra-low-EMI, Class D audio power amplifiers provide Class AB performance with Class D efficiency. The MAX9775/MAX9776 deliver 1.5W per channel into a 4Ω load from a 5V supply and offer efficiencies up to 79%. Active emissions limiting circuitry and spread-spectrum modulation greatly reduce EMI, eliminating the need for output filtering found in traditional Class D devices.

The MAX9775/MAX9776 utilize a fully differential architecture, a full-bridged output, and comprehensive click-and-pop suppression. A 3D stereo enhancement function allows the MAX9775 to widen the stereo sound field immersing the listener in a cleaner, richer sound experience than typically found in portable applications. The devices utilize a flexible, user-defined mixer architecture that includes an input mixer, volume control, and output mixer. All control is done through I²C.

The mono receiver amplifier and stereo headphone amplifier use 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 MAX9775 is available in a 36-bump WLP (3mm x 3mm) package. The MAX9776 is available in a 32-pin TQFN (5mm x 5mm) or a 36-bump WLP (3mm x 3mm) package. Both devices are specified over the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX9775, MAX9776: Simplified Block Diagrams MAX9775, MAX9776: Simplified Block Diagrams 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 .