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).

特性 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 32?

? 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