WM7236E

WM7236E Low Power Bottom Port Digital Silicon Microphone DESCRIPTION The WM7236 is a low-profile digital silicon microphone, optimised for use with low-power ‘Always-on’ voice control applications, such as Cirrus Logic® SoundClear™ software. The WM7236 supports two operational modes, selected according to the applied clock frequency. ‘Voice’ mode provides low current consumption, and sufficient SNR performance for speech recognition algorithms. ‘Hi-Fi Record’ mode offers wide dynamic range, and classleading THD performance. Operation in the ultrasonic band is also supported at high clock frequencies. The WM7236 incorporates Cirrus Logic proprietary CMOS/MEMS membrane technology, offering high reliability and high performance in a miniature, low-profile package. The WM7236 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 WM7236 incorporates a high-performance ADC, which outputs a single-bit data stream using Pulse Density Modulation (PDM) encoding. The WM7236 supports selectable left/right channel assignment for a two-channel digital microphone interface, enabling efficient connection of multiple microphones in stereo/array configurations. The WM7236 offers tight tolerance on the microphone sensitivity, giving reduced variation between parts. This removes the need for in-line production calibration of partto-part microphone variations. FEATURES  ...