Automotive-grade MEMS microphones enhance in-cabin audio

Article By : Susan Nordyk

Automotive-grade SiSonic MEMS microphones from Knowles enhance hands-free calling, voice assistance, and noise cancellation.

Automotive-grade SiSonic MEMS microphones from Knowles enhance hands-free calling, voice assistance, and noise cancellation. The SPH1878 sports an analog interface that supports single-ended and differential modes, while the SPH9855 has a PDM digital interface. Both devices are AEC Q100/103-qualified and provide active noise cancellation for a quieter cabin.

The robust microphones achieve ±1-dB sensitivity matching, with an option to upgrade to ±0.5-dB matching for better beamforming performance. Each device delivers a high dynamic range for high-quality voice pickup. The SPH1878 analog mic has a signal-to-noise ratio of 66.5 dB and an acoustic overload point of 134 dB. The SPH9855 digital mic provides a signal-to-noise ratio of 66 dB and an acoustic overload point of 132.5 dB. SiSonic microphones are also compatible with the European eCall emergency communication system.

Each device has package dimensions of 3.50×2.65 mm. The SPH1878 is 1.26 mm high, while the SPH9855 is 0.98 mm high. The SPH1878 and SPH9855 operate over a temperature range of -40°C to +85°C and -40°C to +100°C, respectively.

The two SiSonic automotive MEMS microphones are currently sampling and are expected to be in production later this year.

SiSonic automotive mic product page

Knowles

This article was originally published on EDN.

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