基于MAX97001设计的单片音频系统方案

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基于MAX97001设计的单片音频系统方案
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

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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:

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