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750mW Audio Amplifiers with Headphone Amp, Microphone Preamp, and Input Mux

750mW Audio Amplifier with Headphone Amp, Microphone Preamp, and Mux Optimized for Portable Audio Applications

Product Details

Key Features

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Key Features

  • 750mW BTL Stereo Speaker Amplifier
  • 65mW Stereo Headphone Amplifier
  • 2.7V to 5.5V Single-Supply Operation
  • Click-and-Pop Suppression
  • Low 0.003% THD+N
  • Low Quiescent Current: 13mA
  • Low-Power Shutdown Mode: 5µA
  • MUTE Function
  • Headphone Sense Input
  • Stereo 2:1 Input Multiplexer
  • Optional 2-Wire, I²C-Compatible, or Parallel Interface
  • Small 32-Pin Thin QFN (5mm x 5mm x 0.8mm) Package

Applications/Uses

  • Cell Phones
  • Digital Cameras
  • Notebook Computers
  • PDA Audio Systems
  • Tablet PCs

Description

The MAX9765/MAX9766/MAX9767 family combines speaker, headphone, and microphone amplifiers, all in a small thin QFN package. The MAX9765 is targeted at stereo speaker playback applications and includes a stereo bridge-tied load (BTL) speaker amp, stereo headphone amp, single-ended output mic amp, input MUX, and I²C control. The MAX9766 is targeted at mono speaker playback applications and includes a mono BTL speaker amp, stereo headphone amp, differential output mic amp, input MUX, and I²C control. The MAX9767 is targeted at applications that do not require a headphone amp and includes a stereo BTL speaker amp, differential output mic amp, and parallel control.

These devices operate from a single 2.7V to 5.5V supply. A high 95dB PSRR allows these devices to operate from noisy supplies without additional power conditioning. An ultra-low 0.003% THD+N ensures clean, low distortion amplification of the audio signal. Click-and-pop suppression eliminates audible transients on power and shutdown cycles.

In speaker mode, the amplifiers can deliver up to 750mW of continuous average power into a 4Ω load. In headphone mode, the amplifier can deliver up to 65mW 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 MAX9765/MAX9766 also feature a 2:1 input multiplexer, allowing multiple audio sources to be selected. The various functions are controlled by either an I²C-compatible (MAX9765/MAX9766) or simple parallel control interface (MAX9767).

All devices include two low-noise microphone preamps, a differential amp for internal microphones, and a single-ended amplifier for additional external microphones. A microphone bias output is provided, reducing external component count.

The MAX9765/MAX9766/MAX9767 are available in a thermally efficient 32-pin thin QFN package (5mm x 5mm x 0.8mm). All devices have short-circuit and 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.