A new family of analog- and digital-output microphones from Analog Devices Inc. employs microelectromechanical-systems (MEMS) technology to deliver a signal-to-noise ratio (SNR) of 61 dB A-weighted. The omni-directional microphones also offer the flattest frequency response from 100 Hz to 15 kHz, according to the company.

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The ADMP421 pulse density modulated (PDM) digital-output microphone is designed for multimedia and VoIP-enabled (Voice over Internet Protocol) cell phones, Bluetooth headsets, and other systems that rely on high-quality digitized voice and audio. The microphone’s digital output provides high immunity to coupled noise from RF and electromagnetic interference emanating from sources such as Wi-Fi antennas and LCD 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 optimize the placement of the ADMP421 to improve audio-enhancement features, such as stereo sound and array beam forming. The ADMP421 features an 80-dB FS power supply rejection ratio (PSRR), Left/Right select, and integrated sleep mode.

The ADMP401 analog-output MEMS microphone is sampling now in a 4.72- by 3.76- by 1.0-mm surface-mount package for $1.63 each in 1000-unit quantities. The ADMP421 digital-output MEMS microphone is sampling now in a 4.0- by 3.0- by 1.0-mm surface-mount package for $2.04 each in 1000-unit quantities.

Analog Devices
www.analog.com

The ADMP421 MEMS microphone from Analog Devices provides a 61-dB A-weighted SNR, suiting it for mobile applications.