News Column

Knowles Engineers to Develop Digital MEMS Microphone

July 1, 2014

The engineers at Knowles Corp. developed a new digital MEMS microphone.

"As device functionality increases, preserving battery life is an important trend in the consumer electronics industry. To enhance the user experience, suppliers need to work with manufacturers to decrease the power required to operate a device," said Mike Adell, Knowles' Co-President of Mobile Consumer Electronics, in a release. "By applying our MEMS expertise and audio knowledge, our engineers enrich the user experience with a more accurate microphone that requires less power."

"Before this product, design engineers were forced to choose between microphones with a high SNR and microphones with a low current draw. Our "Always On, Always Listening" technology allows engineers to have both capabilities in one product," said Thibault Kassir, Senior Director, Product Management, Mobile Consumer Electronics. "This multi-mode microphone exceeds other digital solutions by offering the lowest power consumption in the smallest form factor."

Product Details

-Product: High SNR digital bottom port microphone

-Part Number: SPH0641LM4H-1

-Measurements: 3.50 x 2.65 x 0.98 mm

Product Features

-Multiple performance modes (sleep, low-power, standard mode)

-Lowest power consumption in the market (3x less than other digital microphones)

-High Signal-to-Noise Ratio in low power mode

-Best acoustic performance per square millimeter

-Superwide-band capable

-Sensitivity matching for better algorithm performance

-Best in class RF immunity performance

Technical Data

-Signal-to-Noise Ratio: Nominal 64.3 dB(A)

-Flat Frequency Response: Up to 20 kHz

-Power consumption: 235A in low power mode

-Size: More than 20 percent smaller than other digital microphones

-Sensitivity matching: 1 dB

-Digital output: Serial PDM bit stream

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Source: Health & Beauty Close - Up

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