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MAX9756

MAX9756

2.3W Stereo Speaker Amplifiers and DirectDrive Headphone Amplifiers with Automatic Level Control

Audio Amplifier with Automatic Level Control for Speaker Protection and Better Sound Quality

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Overview

Description

The MAX9756/MAX9757/MAX9758 combine dual, 2.3W, bridge tied load (BTL) stereo audio power amplifiers and a DirectDrive® headphone amplifier in a single device. These devices feature single-supply voltage operation, shutdown mode, logic-selectable gain, a headphone sense input, a 31-step analog volume control, and industry-leading click-and-pop suppression. The headphone amplifier uses Maxim's DirectDrive architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors.

The MAX9756/MAX9757 feature automatic level control (ALC) that automatically limits output power to the speaker in the event of an overpowered output.

The MAX9756/MAX9758s' 150mA internal linear regulator provides a complete solution for DAC- or CODEC-based designs.

The MAX9756/MAX9757/MAX9758 are offered in space-saving, thermally efficient 32-pin (5mm x 5mm x 0.8mm) and 36-pin thin QFN (6mm x 6mm x 0.8mm) packages. All devices are specified over the extended -40°C to +85°C temperature range.
MAX9756, MAX9757, MAX9758: Simplified Block Diagrams MAX9756, MAX9757, MAX9758: Simplified Block Diagrams Enlarge+

Key Features

  • Automatic Level Control—Protects Speakers
  • Analog Volume Control
  • 120mW DirectDrive Headphone Amplifiers (16Ω)
  • 150mA Adjustable LDO
  • Class AB, 2.3W, Stereo BTL Speaker Amplifiers (3Ω)
  • High 95dB PSRR
  • Low-Power Shutdown Mode
  • Industry-Leading Click-and-Pop Suppression
  • Short-Circuit and Thermal Protection
  • Beep Input

Applications/Uses

  • Flat-Panel TVs
  • LCD Projectors
  • Notebook PCs
  • PC Displays
  • Portable Audio
  • Portable DVD Players
  • Tablet PCs

Design Resources

Technical Documents

App Note 3877 ALC Improves Sound Quality While Protecting Speakers
App Note 3673 An Overview of Automatic Level Control

Quality and Environmental Data

Request Reliability Report for: MAX9756 
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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Related Resources

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MAX98360D
Tiny, Cost-Effective, Plug-and-Play Digital Class-D Amplifier

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MAX98360A
Tiny, Cost-Effective, Plug-and-Play Digital Class-D Amplifier

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Technical Docs

Type ID PDF Title
App Note 3877 ALC Improves Sound Quality While Protecting Speakers
App Note 3673 An Overview of Automatic Level Control

Design Guides

PDF Title

Reference Designs

Type ID Title
Evaluation Board5094MAX9756EVKIT Evaluation Kit for the MAX9756