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Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux

3W Stereo Audio Amplifiers with Headphone Amplifier and Input Mux, Optimized for Notebook and DVD Applications

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Industry-Leading, Ultra-High 100dB PSRR
  • 3W BTL Stereo Speaker Amplifier
  • 200mW Stereo Headphone Amplifier
  • Low 0.002% THD+N
  • Click-and-Pop Suppression
  • ESD-Protected Outputs
  • Low Quiescent Current: 13mA
  • Low-Power Shutdown Mode: 10µA
  • MUTE Function
  • Headphone Sense Input
  • Stereo 2:1 Input Multiplexer
  • Optional 2-Wire, I²C-Compatible or Parallel Interface
  • Tiny 28-Pin Thin QFN (5mm x 5mm x 0.8mm) Package

Applications/Uses

  • Camcorders
  • Multimedia Monitors
  • Notebooks
  • PC Audio Peripherals
  • Portable DVD Players
  • Tablet PCs

Description

The MAX9777/MAX9778 combine a stereo 3W bridge-tied load (BTL) audio power amplifier, stereo single-ended (SE) headphone amplifier, headphone sensing, and a 2:1 input multiplexer all in a tiny 28-pin thin QFN package. These devices operate from a single 4.5V to 5.5V supply and feature an industry-leading 100dB PSRR, allowing these devices to operate from noisy supplies without the addition of a linear regulator. An ultra-low 0.002% THD+N ensures clean, low-distortion amplification of the audio signal. Click-and-pop suppression minimizes audible transients on power and shutdown cycles. Power-saving features include low 4mV VOS (minimizes DC current drain through the speakers), low 13mA supply current, and a 10µA shutdown mode. A MUTE function allows the outputs to be quickly enabled or disabled.

A headphone sense input detects the presence of a headphone jack and automatically configures the amplifiers for either speaker or headphone mode. In speaker mode, the amplifiers can deliver up to 3W of continuous average power into a 3Ω load. In headphone mode, the amplifier can deliver up to 200mW of continuous average power into a 16Ω load. The gain of the amplifiers is externally set, allowing maximum flexibility in optimizing output levels for a given load. The amplifiers also feature a 2:1 input multiplexer, allowing multiple audio sources to be selected. The multiplexer can also be used to compensate for limitations in the frequency response of the loud speakers by selecting an external equalizer network. The various functions are controlled by either an I²C-compatible (MAX9777) or simple parallel control interface (MAX9778).

The MAX9777/MAX9778 are available in a thermally efficient 28-pin thin QFN package (5mm x 5mm x 0.8mm). These devices have thermal-overload protection (OVP) and are specified over the extended -40°C to +85°C temperature range.

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 .

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.