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MEMS microphones are CE-bound

Posted: 25 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MEMS? microphone CE? VoIP?


Despite the proliferation of electronics devices that integrate voice, music, and video, the quality of sound produced by these handheld electronics has not lived up to consumer expectations. Analog Devices Inc. has created a microphone capable of high-fidelity A/V playback, conference calling, TIA-920-compliant VoIP, voice recognition, and other functions. ADI combined audio applications know-how with MEMS technology to design a new family of microphones with the industry's highest SNR of greater than 61dB. Today, the highest quality sound available in a cellphone, for example, is just 55dB. The new omni-directional input microphones are available with digital output or analog output and deliver the industry's flattest frequency response from 100Hz to greater than 15kHand with a package size and cost tailored to the design considerations of portable electronics manufacturers, claims ADI.

The ADMP421 pulse digital output MEMS microphone is designed for multimedia and VoIP-enabled cellphones, Bluetooth headsets and other systems that rely on high quality digitized voice and audio. The digital output of the ADMP421 provides high immunity to coupled noise from RF and EMI 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, claims ADI. The ADMP421 features 80dB FS PSRR (power supply rejection ratio), left/right select and integrated sleep mode.

The ADMP401 analog output MEMS microphone also delivers superior PSRR of better than 50dBV, simplifying power supply design requirements to the microphone for near-field and far-field applications, says ADI.

The ADMP401 is sampling now in a thin 4.72mm x 3.76mm x 1mm surface-mount package.

Pricing is $1.63 in 1,000-unit quantities. The ADMP421 is sampling now in a 4mm x 3mm x 1mm surface mount package. The ADMP421 pricing is $2.04 in 1,000-unit quantities.

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