单片音频MAX97001特性及应用电路图

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