General Description

The MAX9720 stereo headphone amplifier combines Maxim’s patented DirectDrive architecture and SmartSense™, an automatic mono/stereo detection feature. Conventional headphone amplifiers require a bulky DC-blocking capacitor between the headphone and the amplifier. DirectDrive produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height.

Features

♦ DirectDrive Eliminates Bulky DC-Blocking Capacitors

♦ SmartSense Automatic Short Detection

♦ Low 5mA Quiescent Current

♦ Fixed Gain Eliminates External Feedback Network

    MAX9720A: -1V/V

    MAX9720B: -1.41V/V

♦ 50mW per Channel Output Power

♦ Ultra-Low 0.003 THD+N

♦ High PSRR (92dB at 217Hz)

♦ Integrated Click-and-Pop Suppression

♦ 1.8V to 3.6V Single-Supply Operation

♦ Thermal Overload Protection

♦ Available in Space-Saving Packages

    16-Bump UCSP (2mm x 2mm x 0.6mm)

    16-Pin TSSOP

Applications

    PDAs

    Cellular Phones

    MP3 Players

    Notebook PCs

    Smart Phones

    Tablet PCs

    Portable Audio Equipment