Design Con 2015

Low-noise MEMS microphone targets hearing aids

-March 27, 2013

Compared to electret condenser microphones, the ADMP801 MEMS microphone from Analog Devices is not only smaller at 7.3 cubic mm, but also produces low EIN (equivalent input noise) of 27 dBa SPL (sound pressure level).
In addition, the device consumes just 17 µA with a 1-V supply, which the manufacturer reports is a fraction of the power consumed by conventional electret microphones.

The ADMP801 is an analog-output, bottom-ported omnidirectional MEMS microphone designed specifically for hearing aids. Housed in a surface-mount LGA package that is 3.35×2.50×0.98 mm, the ADMP801 is one of the smallest hearing-aid microphones on the market, and it is reflow-solderable with no sensitivity degradation.

The ADMP801 MEMS microphone costs $10.78 in lots of 1000 units. An evaluation board, the EVAL-ADMP801Z-FLEX, sells for $95 each.

ADMP801 MEMS microphone product page

Analog Devices, www.analog.com

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