Ultra-High AOP Analogue MEMS Microphone For IoT Applications

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  • TDK Corporation’s latest offering is suitable for external usage where high temperature and high acoustic overload points present system design challenges
  • The device includes an impedance converter and a differential output amplifier

TDK Corporation has introduced the InvenSense ICS-40638 MEMS analogue microphone, ideal for wearable and IoT applications, particularly in outdoor, industrial or harsh environments.

The ICS-40638 includes a MEMS microphone element, an impedance converter and a differential output amplifier. Other high‐performance specifications include

  • ±1 dB sensitivity tolerance
  • Immune to both radiated and conducted RF interference
  • Extended frequency response from 35 Hz to 20 kHz
  • Ultra-high Acoustic Overload Point (AOP) of 138 dB Sound Pressure Level (SPL)
  • Low power operation of 170 µA
  • High Signal to Noise Ratio (SNR) of 63 dB (suitable for noise cancellation)
  • High dynamic range
  • Operation up to 105 degrees Celsius

“The ICS-40638 with its ultra-high AOP and high-temperature operation enables our partners to design acoustic listening systems that stand up to the loudest and noisiest environmental surroundings,” said Kieran Harney, Managing Director, Audio Products, InvenSense, a TDK group company.

The InvenSense ICS-40638 is now available in a small 3.5 mm x 2.65 mm x 0.98 mm bottom port surface‐mount package from authorised distributors. The ICS-40638 evaluation board (EVB) is also available now.


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