A breakthrough innovation in sound sensing from STMicroelectronics

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EBV Elektronik GmbH & Co. KG

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STMicroelectronics Design and Aplication GmbH

ST MEMS microphones are available in plastic packages. The patented technology breakthrough saves space and increases durability in consumer and professional voice-input applications, from mobile phones and tablets to noise-level meters and noise-cancelling headphones.

Assembly on flat-cable printed-circuit boards

While other MEMS microphone manufacturers still produce devices with metallic lids, ST leads the way with industry-unique, innovative plastic packages. ST’s MEMS microphones are suitable for assembly on flat-cable printed-circuit boards that simplify design in today’s space-constrained consumer devices. The patented package technology allows equipment manufacturers to place the ‘sound hole’ either on the top or the bottom of the package to ensure the slimmest possible design and shortest acoustic path from the environment to the microphone. While the microphones with the sound hole on the top (top-port) suit the size and sound-inlet position requirements of laptops and tablets, the bottom-port microphones are mostly used in mobile phones.

ST has recently introduced MP34DT01 - the first MEMS microphone in the market that couples the advantage of a top-port sound-inlet position with unparalleled signal-to-noise ratio (SNR) of 63 dB and flat frequency response in the full audio band of 20–20,000 Hz. The device’s best-in-class SNR makes it also suitable for applications beyond typical consumer applications, such as phonometers – sound-level meters that require high dynamic range. ST’s MEMS Microphone can keep frequency response even after the reflow soldering.

ST's industry-unique capability to manage the whole supply chain and leading-edge MEMS production capacity enables short product-development cycles and time-to-volume for high-performance, cost-competitive silicon acoustic devices.

MEMS microphone are entering new application areas such as voice-enabled gaming, automotive voice systems, acoustic sensors for industry and security applications, and medical telemetry. Its unique construction, performance and form factor has made possible what was unthinkable earlier.

* * Vishal Goyal ... is Technical Marketing Manager – AMS India, Working with STMicroelectronics for 11 years with experience in VLSI design and Marketing.

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