IoT Ecosystem: Cirrus Logic

Cirrus Logic MEMS Microphones

There are several factors which make Cirrus Logic MEMS Microphones a smart choice:

  • Leading audio quality: great sounding audio capture of the quietest or the loudest signal in the noisiest or windiest conditions
  • Robust, flexible design: reliable high quality in small top and bottom port packages that maximize placement options in the smallest form factor
  • System considerations: perfectly matched to ensure optimum performance across the signal chain

WM7331: Bottom Port Analog Silicon Microphone

The WM7331 is a low-profile silicon analog microphone. It offers high Signal to Noise Ratio (SNR) and low power consumption and is suited to a wide variety of consumer applications. The WM7331 incorporates Cirrus Logic® proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The compact integration of transducer and internal circuitry on a single die enables implementation within an extremely small package size. The WM7331 is designed to withstand the high temperatures associated with automated flow solder assembly processes. (Note that conventional microphones can be damaged by this process.) The WM7331 offers tight tolerance on the microphone sensitivity, giving reduced variation between parts. This removes the need for in-line production calibration of part-to-part microphone variations.


  • High SNR (63dB)
  • Low variation in sensitivity (±1dB tolerance)
  • Low current consumption (55µA)
  • Analog output · Bottom Port LGA Package
  • 2.5mm x 1.6mm x 0.9mm package
  • 1.6V to 3.6V supply


  • Mobile phone handsets
  • Wearable devices
  • Portable media players
  • Digital cameras

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