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Oct 28th, 2010
Digital MEMS microphones from Wolfson target high-quality audio processing in mobile devices
Fabless audio chip company Wolfson Microelectronics plc (LSE: WLF.L) launched its next-generation digital silicon micro-electro-mechanical-systems (MEMS) microphones, the WM7210 and the WM7220. The digital MEMS are manufactured with Wolfson’s CMOS/MEMS membrane design, similar to the company’s analog MEMS microphones.
The WM7210 and the WM7220 complement Wolfson’s family of analog MEMS microphones. Based on Wolfson’s proprietary CMOS/MEMS membrane technology, the new digital devices deliver high reliability and performance, and can withstand the high temperatures needed for automated flow solder assembly, which can damage conventional microphones.
The WM7210 and WM7220 also help save battery life with ultra low sleep mode power consumption. When the clock delivered to the microphone drops below a specified frequency, the microphones automatically power down into a sleep mode consuming just 2.5 micro amps.
Each microphone incorporates a high-performance ADC, which outputs a single bit Pulse Density Modulated (PDM) format audio data stream, while the microphone output can be defined for left or right configuration allowing for applications requiring stereo operation. The package is designed to accommodate various porting requests.
The WM7210 is available in a 4 x 3 x 1mm thin package design, priced at $1.83 in 1K volume, while the WM7220 is available in a 4.72 x 3.76 x 1.25mm, priced at $1.83 in 1K volume.
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