Automotive-qualified MEMS microphone has analog interface for audio and ANC systems

04-07-2023 | Infineon | Semiconductors

For ANC (Active Noise Cancellation) systems with an analog interface, Infineon Technologies AG extends its automotive microphone portfolio with the XENSIV MEMS microphone IM68A130A with a flat frequency response to frequencies below 10Hz. It builds on the successful launch of its first automotive-qualified digital MEMS microphone, the IM67D130A, and merges the company's automotive expertise with its technical know-how in high-end MEMS microphones.

The new microphone provides a flat frequency response, a stable phase response, and low-frequency roll-off (LFRO = 10Hz). The high SNR (68dB(A)) and excellent acoustic overload point (AOP = 130dBSPL) deliver excellent speech performance, making it an excellent product for general-purpose microphones in any audio system. It can also be employed for beamforming and ANC, where microphones are strategically positioned in the cabin or at exterior locations to detect sounds in the cabin. An inverted sound wave is then generated via the audio speakers to lower the sound level in the cabin.

This new microphone is qualified according to the AEC-Q103-003 standard, which fulfils the automotive industry's needs. This helps lower the effort and risk of module and system qualification failure. The product will be available for at least the typical vehicle lifecycle, allowing savings in design-in effort and platform solutions development. Also, its extended operating temperature range of up to +105C provides flexible usage in multiple application environments inside and outside the vehicle.

By Seb Springall