TDK-EPC developed a tiny MEMS (micro electro mechanical systems) microphone with an integrated digital interface.
The 3,25 x 2,25 x 1,1 mm T4030 has a sensitivity of -26 dB FS (full scale) and a signal-to-noise ratio of 60 dBA. Even at a sound level of 100 dB, its distortion factor is under 1%, and its frequency response is characterised by high bandwidth and low amplitude fluctuations.
The T4030 is largely insensitive to electromagnetic interference thanks to a digital PDM (pulse density modulation) output. The suppression of the power supply noise is -82 dB FS. Two channels can also be transmitted via one signal line, making stereo applications simpler to implement than in analog technology. The supply voltage range is between 1,64 and 2,86 V. Power consumption is 650 μA and is reduced to less than 10 μA in standby operation.
Thanks to its compact dimensions and outstanding electrical properties, the microphone is not only suitable for consumer electronics applications but also for applications with high requirements on audio quality. This includes high-quality video and VoIP systems, telephone conference installations, beam forming and noise suppression systems.
The T4030 is manufactured in the CSMP (chip-sized MEMS package) technology, which was developed for SAW filters and has already proved itself in billions of mobile phones. It thus benefits from matured Epcos production processes as well as more than 15 years’ experience in the development of MEMS microphones. TDK-EPC also uses the proven technology of SAW production for the final electro-acoustic measurement. The MEMS microphones are RoHS-compatible and suitable for lead-free SMD reflow solder processes.
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