TDK has extended its range of EPCOS MEMS microphones with the new C928 type. This microphone is distinguished by its particularly high signal-to-noise ratio (SNR) of 66 dB(A) in the frequency range between 20 Hz and 20 kHz. 

In conventional microphones, an improved signal-to-noise ratio usually leads to a sharp rise in nonlinear distortions at high sound pressures. Thanks to the innovative design of the C928 MEMS microphone, a distortion factor of only one percent is produced even at a sound level of 131 dB. That makes it equally suitable for recording extremely loud sound sources.

Besides its excellent acoustic properties, the C928 features a compact size with a footprint of 3.35 mm x 2.5 mm and an insertion height of only 1 mm. Thanks to its symmetrical output, the new MEMS microphone offers high immunity to interference. Its operating voltage is between 1.6 V and 3.6 V, and its maximum power consumption is 140 µA.

Main applications

• Smartphones and other mobile electronics devices

Main features and benefits

• Very high signal-to-noise ratio of 66 dB(A)
• Low distortion of 1 percent even at sound levels of 131 dB
• Compact dimensions of 3.35 mm x 2.5 mm x 1 mm

Mass production of the C928 is due in Q1-2015