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MAX9728, MAX9728A, MAX9728B
60mW, DirectDrive, Stereo Headphone Amplifier with Shutdown

60mW DirectDrive™ Headphone Amplifiers Ideal for TV and Notebook Applications


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Description
FULL DATA SHEET (PDF, 640kB)
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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, patented 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).

Key Features   Applications/Uses
  • 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)

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

    Key Specifications:   Headphone Amplifiers
    Part Number Headphone Amp. VCC (min) (V) Headphone Amp. VCC (max) (V) Headphone Amp. ICC (typ) (mA) Headph. Amp. POUT into 32Ω @1% THD+N (W) Headphone Amp. Half Pwr. THD+N (%) SNR, A-weighted (dB) PSRR (db) Headphone Amp. External Gain Headphone Amp. Fixed Gain (min) (|V/V|) Headphone Amp. Fixed Gain (max) (|V/V|) RoHS Available Package Smallest Available Package (max w/pins) (mm2) Price**
    MAX9728  4.5 5.5 3.5 63 0.02 101 86 Yes 1.5 1.5 Yes THIN QFN/12
    TSSOP/14
    10 $0.48 @ 1k
    See All Headphone Amplifiers (11)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX9728A, MAX9728B: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-3963; Rev 0; 2006-01-26
    This page last modified: 2007-07-12



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