Date: 14/02/2012

MEMS mic with SNR performance of 65-dBA

Analog Devices has introduced MEMS microphone coded ADMP504 with lowest-noise specs of SNR (signal-to-noise ratio) of 65-dBA, or 29-dBA EIN (equivalent input noise), the ADMP504 is said to provide the same SNR performance as an array of two individual 62-dB SNR microphones. The ADMP504 also provides an extended frequency response up to 20 kHz and a high PSR (power-supply-rejection) of 70 dBV. The new microphone 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.

"ADI's high-performance MEMS microphones have earned market acceptance since they entered the market in 2008, particularly in smartphones and media tablets," commented Jérémie Bouchaud, director and principal analyst, MEMS and sensors, IHS. "With further performance improvements, ADI is poised to enable many new and innovative applications in other markets such as industrial equipment monitoring and building security."

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.

Availability, Price and Package:

Product Sample Availability Full Production Price Each Per 1,000 Packaging
ADMP504 Now Now $1.85 3.35-mm × 2.50-mm × 0.88-mm surface-mount LGA package
More info at www.analog.com