Cirrus Logic, Inc. Top Port Analog Microphone WM7121

The WM7121 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 WM7121 incorporates Cirrus Logic’s proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The WM7121 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 WM7121 top port microphone offers matched performance to the WM7132 bottom port microphone. The matched characteristics enable highly accurate sound pick up in opposite directions, suitable for noise cancelation and other DSP algorithms. The WM7121 variant offers a tighter 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. Features High SNR (65 dB) Low variation in sensitivity ±1 dB tolerance (WM7121) Matched pair with bottom port microphone WM7132 Matched sensitivity, roll-off and phase response Low current consumption (190µA) Analog output Top port LGA package 1.5V to 3.7V supply