MEMS microphones boast high SNR

29 April 2009 Analogue, Mixed Signal, LSI

Analog Devices has created a microphone capable of high-fidelity audio/video playback, conference calling, TIA-920-compliant VoIP (voice-over-IP), voice recognition and other functions. AD combined audio applications know-how with MEMS (micro-electromechanical systems) technology to design a new family of microphones with SNR (signal-to-noise ratio) of greater than 61 dB A-weighted. The omnidirectional input microphones are available with digital output or analog output and deliver very flat frequency response from 100 Hz to greater than 15 kHz.

The ADMP421 PDM (pulse density modulated) digital output MEMS microphone is designed for multimedia and VoIP-enabled cellphones, Bluetooth headsets and other systems that rely on high quality digitised voice and audio. The digital output of the microphone provides high immunity to coupled noise from RF (radio frequency) and EMI (electromagnetic interference) emanating from sources such as WiFi antennas and LCD (liquid crystal display) clock signals. By eliminating the need for analog signal conditioning, as well as the cable shielding materials commonly required to route analog signals, system designers can optimise the placement of the microphone to improve audio enhancement features such as stereo sound and array beam forming. The device features 80 dB FS PSRR (power supply rejection ratio), left/right select and integrated sleep mode.

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