MEMS microphones deliver clear sound recording

The first devices developed are a pair of compact, high SNR analog microphones (with part numbers WM7110 and WM7120) for consumer applications that need low-power use and high signal quality. The two microphones use the company's proprietary CMOS/MEMS membrane technology known as AudioPlus True Mics, which is based on its MEMS transducer IP and uses standard CMOS foundries.

The compact WM7110 (4.72mm x 3.76mm x 1.25mm) and ultracompact WM7120 (3.76mm x 2.95mm x 1.1mm) devices usually consume 160?A. Both products provide an improved 62dB SNR (A-weighted) performance, reducing the noise floor in the microphone to meet cost-effective, crystal clear sound transduction. The devices also have low total harmonic distortion of 0.5 percent maximum at 100dB sound pressure level, high linearity and flat-phase response.

Wolfson also provides improved WM7110E and WM7120E versions of the two devices, which are the first MEMS silicon microphones to give a sensitivity tolerance of ±1dB.

- Ismini Scouras
eeProductCenter