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1V, Fixed-Gain, DirectDrive®, Stereo Headphone Amplifier with Shutdown

1V, Fixed-Gain, DirectDrive, Stereo-Headphone Amplifier with Shutdown Ideal for Portable Equipment where Board Space Is at a Premium

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Single Cell, 0.9V to 1.8V Single-Supply Operation
  • Fixed Gain Eliminates External Feedback Network
    • MAX9721A: -2V/V
    • MAX9721B: -1.5V/V
    • MAX9721C: -1V/V
  • Ground-Referenced Outputs Eliminate DC Bias
  • No Degradation of Low-Frequency Response Due to Output Capacitors
  • 20mW per Channel into 32Ω
  • Low 0.006% THD+N
  • High PSRR (80dB at 1kHz)
  • Integrated Click-and-Pop Suppression
  • Low Quiescent Current (2.2mA)
  • Low-Power Shutdown Control
  • Short-Circuit Protection
  • ±8kV ESD-Protected Amplifier Outputs
  • Available in Space-Saving Packages
    • 12-Bump UCSP (1.54mm x 2.02mm x 0.6mm)
    • 12-Pin Thin QFN (4mm x 4mm x 0.8mm)

Applications/Uses

  • Cell Phones
  • MP3 Players
  • PDAs
  • Portable Audio Equipment
  • Smartphones

Description

The MAX9721 fixed-gain, stereo headphone amplifier is ideal for portable equipment where board space is at a premium. The MAX9721 uses a unique DirectDrive architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. Fixed gains of -2V/V (MAX9721A), -1.5V/V (MAX9721B), and -1V/V (MAX9721C) further reduce external component count.

The MAX9721 delivers up to 20mW per channel into a 32Ω load and achieves 0.006% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows the MAX9721 to operate from noisy digital supplies without an additional linear regulator. The MAX9721 includes ±8kV ESD protection on the headphone output. Comprehensive click-and-pop circuitry suppresses audible clicks and pops at startup and shutdown. A low-power shutdown mode reduces supply current to 1.0µA (typ).

The MAX9721 operates from a single 0.9V to 1.8V supply allowing the device to be powered directly from a single AA or AAA battery. The MAX9721 consumes only 2.2mA of supply current, provides short-circuit protection, and is specified over the extended -40°C to +85°C temperature range. The MAX9721 is available in a tiny (1.54mm x 2.02mm x 0.6mm), 12-bump chip-scale package (UCSP™) and a 12-pin thin QFN package (4mm x 4mm x 0.8mm).

Simplified Block Diagram

MAX9721: Functional Diagram MAX9721: Functional Diagram 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.