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MAX9722A, MAX9722B

5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown

Next-Generation DirectDrive Headphone Amplifiers Offer Differential Inputs and 5V Operation

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Sampling:
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Key Features

  • 2.4V to 5.5V Single-Supply Operation
  • High PSRR (80dB at 217Hz) Eliminates LDO
  • No Bulky DC-Blocking Capacitors Required
  • Ground-Referenced Outputs Eliminate DC Bias Voltage on Headphone Ground Pin
  • No Degradation of Low-Frequency Response Due to Output Capacitors
  • Differential Inputs for Enhanced Noise Cancellation
  • Adjustable Gain (MAX9722A) or Fixed -2V/V Gain (MAX9722B)
  • 130mW per Channel into 32Ω
  • Low 0.009% THD+N
  • Integrated Click-and-Pop Suppression
  • Low Quiescent Current (5.5mA)
  • Short-Circuit and Thermal-Overload Protection
  • ±8kV ESD-Protected Amplifier Outputs (Human Body Model)
  • Available in a Space-Saving 16-Pin Thin QFN (3mm x 3mm x 0.8mm) Package

Applications/Uses

  • Cell Phones
  • Flat-Panel Monitors
  • MP3 Players
  • Notebook and Desktop PCs
  • PDAs
  • Portable Audio Equipment
  • Smartphones

Description

The MAX9722A/MAX9722B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The MAX9722A/MAX9722B use a unique DirectDrive® architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, which saves cost, board space, and component height. Additionally, the gain of the amplifier is set internally (-2V/V, MAX9722B) or adjusted externally (MAX9722A). The MAX9722A/MAX9722B deliver up to 70mW per channel into a 16Ω load or 130mW into a 32Ω load and have low 0.009% THD+N. An 80dB at 217Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. The MAX9722A/MAX9722B include ±8kV ESD protection on the headphone outputs. Comprehensive anticlick-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. A low-power shutdown mode reduces the supply current to 0.1µA.

The MAX9722A/MAX9722B operate from a single 2.4V to 5.5V supply, consume only 5.5mA of supply current, feature short-circuit and thermal-overload protection, and are specified over the extended -40°C to +85°C temperature range. The devices are available in tiny 16-pin thin QFN (3mm x 3mm x 0.8mm) and 16-pin TSSOP packages.

Simplified Block Diagram

MAX9722: Typical Application Circuit MAX9722: Typical Application Circuit 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.