Top

60mW, DirectDrive, Stereo Headphone Amplifier with Shutdown

60mW DirectDrive Headphone Amplifiers Ideal for TV and Notebook Applications

Product Details

Key Features

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 .

Key Features

  • No Bulky DC-Blocking Capacitors Required
  • Low-Power Shutdown Mode, < 0.1µA
  • Adjustable Gain (MAX9728A) or Fixed -1.5V/V Gain (MAX9728B)
  • Low 0.02% THD+N
  • High PSRR (80dB at 1kHz) Eliminates LDO
  • Integrated Click-and-Pop Suppression
  • 4.5V to 5.5V Single-Supply Operation
  • Low Quiescent Current (3.5mA)
  • Available in Space-Saving Packages
    • 12-Pin Thin QFN (3mm x 3mm x 0.8mm)
    • 14-Pin TSSOP (5mm x 4.4mm x 1.1mm)

Applications/Uses

  • CRT TVs
  • DVD Players
  • LCD/PDP Displays
  • Multimedia Monitors
  • Notebook PCs

Description

The MAX9728A/MAX9728B stereo headphone amplifiers are designed for display and notebook applications or portable equipment where board space is at a premium. These devices use 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. The MAX9728A offers an externally adjustable gain, while the MAX9728B has an internally preset gain of -1.5V/V. The MAX9728A/MAX9728B deliver up to 60mW per channel into a 32Ω load and have low 0.02% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown.

The MAX9728A/MAX9728B operate from a single 4.5V to 5.5V supply, consume only 3.5mA 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 12-pin Thin QFN (3mm x 3mm x 0.8mm) and 14-pin TSSOP packages (5mm x 4.4mm x 1.1mm).

Simplified Block Diagram

MAX9728A, MAX9728B: Typical Operating Circuit MAX9728A, MAX9728B: Typical Operating 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 .