原标题：Maxim MAX97001单片音频系统解决方案

　　Maxim公司的MAX97001是单声道音频子系统,包括单声道扬声器放大器,立体声耳机放大器和模拟DPST开关. 扬声器和立体声耳机放大器是单独音量控制,4个输入可配置成两个差分输入或4个单端输入.2.7V-5.5V扬声器电源,输出700mW,1.6V-2V耳机电源,每路输出37mW.主要用在手机和PMP.本文介绍MAX97001主要特性, 功能方框图与应用框图,MAX97001评估板主要特性,电路图和材料清单(BOM).

　　The MAX97001 mono audio subsystem combines a mono speaker amplifier with a stereo headphone amplifier and an analog DPST switch. The headphone and speaker amplifiers have independent volume control and on/off control. The 4 inputs are configurable as 2 differential inputs or 4 single-ended inputs.

　　The entire subsystem is designed for maximum efficiency. The high-efficiency, 700mW, Class D speaker amplifier operates directly from the battery and consumes no more than 1µA in shutdown mode. The Class H headphone amplifier utilizes a dual-mode charge pump to maximize efficiency while outputting a ground-referenced signal that does not require output coupling capacitors.

　　The speaker amplifier incorporates a distortion limiter to automatically reduce the volume level when excessive clipping occurs. This allows high gain for low-level signals without compromising the quality of large signals.

　　All control is performed using the 2-wire I²C interface. The MAX97001 operates over the extended -40℃ to +85℃ temperature range, and is available in the 2mm x 2.5mm, 20-bump, WLP package (0.5mm pitch).

　　MAX97001主办要特性:

　　2.7V to 5.5V Speaker Supply Voltage

　　1.6V to 2V Headphone Supply Voltage

　　700mW Speaker Output (VPVDD = 3.7V, ZSPK = 8Ω + 68µH)

　　37mW/Channel Headphone Output (RHP = 16Ω)

　　Low-Emission Class D Amplifier

　　Efficient Class H Headphone Amplifier

　　Ground-Referenced Headphone Outputs

　　2 Stereo Single-Ended/Mono Differential Inputs

　　Integrated Distortion Limiter (Speaker Outputs)

　　Integrated DPST Analog Switch

　　No Clicks and Pops

　　TDMA Noise Free

　　2mm x 2.5mm, 20-Bump, 0.5mm Pitch WLP Package

　　MAX97001应用:

　　Cell Phones

　　Portable Multimedia Players

　　图1.MAX97001简化方框图

　　图2.MAX97001功能方框图与应用框图

　　MAX97001评估板

　　The MAX97001 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX97001 mono Class D audio power amplifier and stereo Class H DirectDriveM headphone amplifier communicating over a 2-wire I2C interface. The EV kit features an on-board microcontroller for communicating with the I2C interface of the MAX97001. PCB pads are provided for accessing the analog inputs and amplifier outputs.

　　The MAX97001 EV kit requires a 2.7V to 5.5V supply for PVDD and a 1.8V supply for VDD.

　　WindowsM 2000-, Windows XPM-, and Windows VistaMcompatible software is provided to facilitate configuration.

　　The software controls an on-board microcontroller over USB, which generates I2C commands.

　　MAX97001评估板:

　　Proven Audio PCB Layout

　　On-Board USB Interface Circuit Generates I2CCompatible Signals

　　PCB Pads for User-Supplied I2C-Compatible Signals

　　Surface-Mount Components

　　Windows 2000-, Windows XP-, and Windows Vista (32-Bit)-Compatible Software

　　Fully Assembled and Tested

　　图3.MAX97001评估板电路图(1)

　　图4.MAX97001评估板电路图(2)

　　MAX97001评估板元件清单: