Date: 26/09/2008

High performance MEMS microphones from Analog Devices

Analog Devices launched a new family of MEMS-based digital and analog output microphones, which delivers industry's best signal-to-noise ratio and frequency response.

Analog Devices told that the new family of microphone is capable for high-fidelity audio/video playback, conference calling, TIA-920-compliant VoIP (voice-over-IP) and voice recognition.

The new omni-directional input microphones available are the ADMP421 PDM (pulse density modulated) digital output MEMS microphone and the ADMP401 analog output MEMS microphone.

The device offer several advantages of the MEMS technology as well such as it can withstand high reflow temperatures, can be easily integrated with CMOS processes and other audio electronics and they offer improved noise cancellation.

The key features include:

1. SNR (signal-to-noise ratio) of greater than 61-dB (compared to that of 55 dB available in a cell phone).
2. Flattest frequency response from 100 Hz to greater than 15k Hz.
3. High immunity to coupled noise from RF and EMI coming from sources such as WiFi antennas and LCD clock signals.
4. No need for analog signal conditioning, as the ADMP421 provides digital output.
5. No need of cable shielding materials (commonly required to route analog signals).
6. ADMP421 features 80dB FS PSRR (power supply rejection ratio), Left/Right select, and integrated sleep mode.
7. ADMP401 delivers PSRR of better than 50 dBV

Pricing: ADMP401 pricing is $1.63 in 1K-unit quantities.
ADMP421 pricing is $2.04 in 1K-unit quantities.

Package & size: ADMP401-- 4.72mm x 3.76mm x 1.0mm surface mount package.
ADMP421-- 4.0mm x 3.0mm x 1.0mm surface mount package.

For more information visit: http://www.analog.com/mic