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WM7220IMS/V Scheda tecnica(PDF) 1 Page - Wolfson Microelectronics plc |
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WM7220IMS/V Scheda tecnica(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 12 page  w WM7220, WM7220E Top Port Digital Silicon Microphone WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews Preliminary Technical Data, December 2011, Rev 2.3 Copyright 2011 Wolfson Microelectronics plc DESCRIPTION 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 applications. 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. The WM7220E variant offers a tighter tolerance on the microphone sensitivity, giving reduced variation between parts. This removes the need for in-line production calibration of part-to-part microphone variations. FEATURES High SNR; selectable sensitivity tolerance options - WM7220 – SNR 58dB, Sensitivity +/- 3dB - WM7220E – SNR 58dB, Sensitivity +/- 1dB Low power - Sleep mode - 2μA - 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 1.22mm thin package design APPLICATIONS Mobile telephone handsets Portable computers Portable media players Digital still cameras Digital video cameras Bluetooth headsets Portable navigation devices BLOCK DIAGRAM |
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