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Wolfson 公司的WM7220是小型数字硅麦克风,具有高信噪比(58dB)和低功耗(睡眠模式10uA,正常工作为650uA),它接纳有所有权的CMOS/MEMS技能,集成了高性能ADC,PDM数字音频输出,工作电压1.6V-3.7V,广泛用在消费类电子产物包罗手机,便携式设备,数码相机,数码摄影机,蓝牙手机,手提导航设备和多媒体播放器等.本京电港论坛文章先容了WM7220主要特点,方框架图以及评估板电路原理图纸和质料费清单(BOM). The WM7220 is a low-profile silicon digital microphone. It offers high Signal to Noise Ratio (SNR) and low power consumption and is suited to a wide variety of consumer The WM7220 incorporates Wolfson’s proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The WM7220 is designed to withstand the high temperatures associated with automated flow solder assembly processes. (Note that conventional microphones can be damaged by this process.) The WM7220 incorporates a high performance ADC, which outputs a single-bit Pulse Density Modulated (PDM) audio data stream. The WM7220 supports selectable left/right channel assignment for a two-channel digital microphone interface, enabling efficient connection of multiple microphones in stereo/array configurations. WM7220主要特点: High SNR (58dB) Low power - Sleep mode - 10μA - Normal operation - 650μA Low profile packaging Support for automated flow solder assembly PDM digital audio output Stereo/array operation Proprietary ADC technology - Reduced clock jitter sensitivity - Low noise floor modulation - Stable in overload condition Top port package 1.64V to 3.7V supply 4.72 x 3.76 x 1.25mm thin package design WM7220应用: Mobile telephone handsets Portable computers Portable media players Digital still cameras Digital video cameras Bluetooth headsets Portable navigation devices |
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