MEMS microphone boasts high SNR

6 February 2013 Analogue, Mixed Signal, LSI

TDK has rolled out the new EPCOS C914 MEMS microphone, offering a high signal-to-noise ratio (SNR) of 65 dB(A) in the frequency range from 20 Hz to 20 kHz. It is thus particularly suitable for demanding audio applications in smartphones.

The device’s high SNR improves audio quality considerably when the signal source is distant from the microphone, such as in video recordings or hands-free talking. Thanks to the innovative design of the C914, distortion is no more than 1% even at a sound volume of 128 dB. In contrast to this, an improvement of the signal-to-noise ratio of conventional microphones as a rule leads to a strong rise of the nonlinear distortion at high acoustic pressures.

The microphone has a footprint of 3,35 x 2,5 mm and an insertion height of 1 mm. At a supply voltage of between 1,64 and 3,6 V d.c., its current consumption is 300 μA. The output impedance of this RoHS-compatible component is 200 Ω.

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