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High-performance, low-noise MEMS microphone
February 14, 2012 // Paul Buckley
Analog Devices, Inc. (ADI) has introduced the high-performance ADMP504 featuring the industry’s lowest-noise MEMS microphone. Delivering an SNR (signal-to-noise ratio) of 65-dBA, or 29-dBA EIN (equivalent input noise), the ADMP504 provides the same SNR performance as an array of two individual 62-dB SNR microphones. In addition, the ADMP504 provides an extended frequency response up to 20 kHz and a high PSR (power-supply-rejection) of 70 dBV.
The ADMP504 addresses the demanding requirements found in many industrial, professional audio and video conferencing applications. The new microphone applies ADI’s patented MEMS technology and audio signal processing expertise and is available in a thin 3.35 mm × 2.50 mm × 0.88 mm surface-mount package.
Global shipments of MEMS microphones rose to 1.3 billion units in 2011, up 82 percent from 704 million in 2010 driven primarily by handsets, according to IHS.
The ADMP504 is a surface-mount MEMS microphone that is reflow-solder-compatible with no sensitivity degradation. The sensitivity specification of -38 dBV is well suited for many codecs and discrete signal chain components. The high SNR of 65 dBA, or 29-dBA EIN, enables far-field audio-capture applications, as well as those using multi-microphone beam-forming algorithms. Low current consumption of <180 μA (typ) with a power supply voltage of 1.6 V to 3.3 V extends battery life for portable applications.
The ADMP504 packaged in a 3.35-mm × 2.50-mm × 0.88-mm surface-mount LGA, is available now, and is in production.
www.analog.com/ADMP504
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Filter Wizard
Check out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
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