如今MEMS麦克风正逐渐取代音频电路中的驻极体电容麦克风（ECM）。ECM和MEMS这两种麦克风的功能相同，但各自和系统其余部分之间的连接却不一样。本应用笔记将会介绍这些区别，并根据一个简单的基于MEMS麦克风的替换电路提供设计详情。 音频电路的ECM连接 ECM有两根信号引线：输出和接地。麦克风通过输出引脚上的直流偏置实现偏置。这种偏置通常通过偏置电阻提供，而且麦克风输出和前置放大器输入之间的信号会经过交流耦合。 ECM的常见用例是在手机上连接的耳机中用作内联式语音麦克风。这种情况下，耳机和手机之间的连接器有四个引脚：左侧音频输出、右侧音

MEMS全向麦克风模块介绍: This tiny breakout board features the ADMP401 MEMs microphone. One of the key advantages to this breakout and microphone is the bottom ported input. This means the microphone’s input can fit flush against the enclosure of your project. Plus you will not have to deal with trying to solder the microphone’s wacky footprint. Wootness! The amplifier on the breakout has a gain of 67 and more than meets the bandwidth requirements of the mic. The amplifier’s AUD output will float at one half Vcc when no sound is being picked up. The amplifier produces a peak-to-peak output of about 200mV when the microphone is held at arms length and is being talked into at normal conversational volume levels. So the AUD output can easily be connected to the ADC of a micro. MEMS全向麦克风特点: -3dB roll off at 100Hz and 15kHz 1.5 to 3.3VDC supply voltage Should comfortably output 40mW SNR of -62dBA MEMS全向麦克风中文大概描述: MEMS全向麦克风模块实物图片展示: MEMS全向麦克风电路截图: 附件内容截图:

美信公司的低噪声麦克风放大电路。具有高电源抑制比的麦克风偏置电路。和极低的噪音输出。适用于高保真场合