Maxim公司的MAX97001是單聲道音頻子系統,包括單聲道揚聲器放大器,立體聲耳機放大器和模擬DPST開關. 揚聲器和立體聲耳機放大器是單獨音量控制,4個輸入可配置成兩個差分輸入或4個單端輸入.2.7V-5.5V揚聲器電源,輸出700mW,1.6V-2V耳機電源,每路輸出37mW.主要用在手機和PMP.本文介紹MAX97001主要特性, 功能方框圖與應用框圖,MAX97001評估板主要特性,電路圖和材料清單(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主辦要特性:
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應用:
Cell Phones
Portable Multimedia Players
圖1.MAX97001簡化方框圖
圖2.MAX97001功能方框圖與應用框圖
MAX97001評估板
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評估板:
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
圖3.MAX97001評估板電路圖(1)
圖4.MAX97001評估板電路圖(2)
MAX97001評估板元件清單:
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