WM7211: Top Port Digital Silicon Microphone


The WM7211 is a low-profile silicon digital microphone. It offers high Signal to Noise Ratio (SNR) and low power consumption and is suited to a wide variety of consumer applications.

The WM7211 incorporates Wolfson's proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The WM7211 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 WM7211 incorporates a high performance ADC, which outputs a single-bit Pulse Density Modulated (PDM) audio data stream. The WM7211 supports selectable left/right channel assignment for a two-channel digital microphone interface, enabling efficient connection of multiple microphones in stereo/array configurations.


  • High SNR; selectable sensitivity tolerance options
    - WM7211 – SNR 61dB, Sensitivity +/-3dB
  • Low power
    - Sleep mode - 2μA
    - Normal operation - 735μA
  • Low profile packaging
  • Support for automated flow solder assembly
  • PDM digital audio output
  • Stereo/array operation
  • Proprietary ADC technology
    Reduced clock jitter sensitivity
    Low noise floor modulation
    Stable in overload condition
  • Top port package
  • 1.64V to 3.7V supply
  • 4.00 x 3.00 x 1.00mm thin package design