Top-port MEMS microphones

20 March 2013 Analogue, Mixed Signal, LSI

New from TDK are the EPCOS C920 and C923 top-port MEMS microphones with footprints of only 2,75 x 1,85 mm and an insertion height of 0,9 mm.

Thanks to their design, the air volume in the microphones is small, so that no resonances occur in the 10 kHz range, resulting in outstanding audio quality with a flat frequency response.

The microphones have a very good signal-to-noise ratio of 56 dB (C920) and 57 dB (C923) respectively. The C923 type offers a very flat frequency response even in the lowest frequency range of the audio spectrum. A high-pass filter that suppresses frequencies below 100 Hz is integrated into the C920 microphone. This means that no wind noise is transmitted, for instance.

At supply voltages of between 1,64 and 3,6 V d.c., current consumption is only 125 μA. These RoHS-compatible components have an output impedance of 260 Ω.

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