General 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, patented 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).

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 ✕ 3mm ✕ 0.8mm) Package

Applications

    Notebook and Desktop PCs

    MP3 Players

    Flat-Panel Monitors

    Cellular Phones

    Smart Phones

    PDAs

    Portable Audio Equipment