MEMS microphone provides high SNR of 66dB(A)

9th January 2014

Nat Bowers

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Datasheet

Particularly suitable for demanding audio applications in smartphones, TDK has introduced the C928 MEMS microphone. In the frequency range of 20Hz-20kHz, this microphone offers a high SNR of 66dB(A) to improve the audio quality of distant sound sources, i.e. when using the speakerphone or recording video.

Also suitable for recording extremely loud sound sources, the C928 MEMS microphone provides low total harmonic distortion with a tiny 1% distortion factor even at a sound level of 131dB. This contrasts to conventional microphones, where an improved SNR usually correlates with a marked increase in nonlinear distortions at high sound pressures. The symetrical output of the MEMS microphone means that it offers high immunity to interference.

Additionally, the C928 offers a very narrow sensitivity tolerance of just ±1dB while the microphone’s balanced output improves the EMI performance in noisy environments. Therefore the MEMS device is suited for noise cancelling applications. The MEMS microphone also features power supply rejection of -67dB (20Hz-20kHz) and output impedance of 225Ω (from each output to GND).

Operating over input volatges from 1.6-3.6V, the C928 has a maximum power consumption of just 140µA. These energy-saving features reinforce the device's suitability for battery-powered applications, particularly smartphones and other mobile electronics devices.

In addition to excellent energy-saving and accoustic properties, the C928 microphone is supplied in a compact size with a footprint of 3.35x2.5mm and an insertion height of only 1mm. RoHS compatible, the C928 MEMS microphone from TDK is available now.