MEMS Microphone Chip

The AKU2000 surface-mountable complementary metal oxide semiconductor (CMOS) microelectromechanical systems (MEMS) microphone integrates an acoustic transducer, output amplifier, and 4th-order sigma-delta modulator in a single chip. Microphone output switches from pulse-density-modulated (PDM) and single-bit digital output stream insensitive to radio frequency (RF) and electromagnetic interference (EMI); saving time and costs in system design. A digital filter reduces PDM output in downstream electronics for design flexibility. AKU2000 supports an input clock frequency of 1 to 4 MHz, and operates from 2.8 to 3.6 V, consuming <750 mA. It suits microphone array applications where multiple microphones will be used to perform noise cancellation and/or beam forming. Akustica Inc., Pittsburgh, PA,


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