The MP34DT01-M from STMicroelectronics is a tiny, low-power MEMS microphone with a digital audio-signal output.
Its capacitive-sensing element, capable of detecting acoustic waves, is manufactured using a silicon micro-machining process developed specifically for the production of audio sensors. Its IC interface is made in a CMOS process which enables the creation of a dedicated signal-processing circuit. Its digital signal output is provided in pulse-density modulation format.
Average current in normal operation is 0.6mA. The MP34DT01-M also has a power-down mode in which the current it draws is just 20μA. The MP34DT01-M has an acoustic overload point of 120dB Sound Pressure Level (SPL). The signal-to-noise ratio is 61dB, and the microphone’s omnidirectional sensitivity is -26dBFS. The MP34DT01-M is available in a top-port, surface-mount, EMIshielded package measuring 3mm x 4mm x 1mm. It is guaranteed to operate over an extended temperature range from – 40°C to 85°C.
- Supply-voltage range: 1.64V to 3.6V
- 10ms maximum turn-on time
- <1% total harmonic distortion and noise at 100dBSPL
- Portable media players
- VoIP terminals
- Speech-recognition equipment
- eLearning devices
- Gaming and virtual-reality input devices
- Theft-prevention systems