MEMS microphones

26 May 2010 Analogue, Mixed Signal, LSI

Analog Devices has created two new MEMS microphones that enable advanced audio functions for portable electronics.

These functions include high-fidelity audio/video playback, hands free communication, voice recognition with built-in wind noise suppression, and TIA-920 compliance for VoIP applications.

The new ADMP 404 and ADMP405 iMEMS microphones offer SNR (signal-to-noise ratio) of 62 dB A-weighted and PSRR (power supply rejection ratio) of 70 dBV with integrated high-pass filtering. The devices are available in a small and thin 3,35 × 2,50 × 0,88 mm surface-mount package that is reflow solder compatible with no sensitivity degradation.

Delivering a flat wideband frequency response from 100 Hz to 15 kHz on the ADMP404 and from 200 Hz to 15 kHz on the ADMP405, these microphones eliminate the need for hardware filtering or advanced signal processing to enhance audio acquisition. The ADMP405’s 200 Hz roll-off enables engineers to filter wind noise or fan noise energy at the transducer; this provides a clearer audio signal that can be more easily conditioned with any downstream signal processing.

The ADMP404 consists of a MEMS microphone element, an impedance converter and an output amplifier. Its sensitivity of -38 dBV makes it a suitable choice for both near-field and far-field applications. Low power consumption enables long battery life for portable applications. A built-in particle filter provides high reliability. The ADMP404 complies with the TIA-920 ‘Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones’ standard.

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