Industry’s lowest-noise MEMS microphone
21 February 2012
Analog Devices sets high-performance benchmark.
Analog Devices, Inc. has introduced a high-performance ADMP504 featuring the industry’s lowest-noise MEMS microphone. Delivering a 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. With this performance, the ADMP504 addresses the demanding requirements found in many industrial, professional audio and video conferencing applications. The new microphone leverages 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.
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 is function and pin-compatible with the ADMP404 providing designers with an easy upgrade path. Additional 65-dB SNR MEMS microphones are planned for this family, including a PDM (pulse-density-modulation) output version.
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