Akustica Declares First CMOS Single-Chip MicrophoneMarch 1, 2006
The AKU2000 is a surface-mountable digital output microphone which integrates an acoustic transducer, output amplifier and 4 th order sigma-delta modulator in a single chip. The output of the microphone is Pulse Density Modulated (PDM), or a single-bit digital output stream that is insensitive to radio frequency (RF) and electromagnetic interference (EM); it therefore saves significant time and expense in system design and eliminates the dependence on shielded cabling for signal routing.
The PDM output of the AKU2000 can be decimated by a digital filter in downstream electronics for a high degree of design flexibility and freedom. The AKU2000 supports an input clock frequency of 1-4MHz and operates from 2.8-3.6V, consuming <750 A. The AKU2000 goes into power-down mode, consuming only <75 A of current, when there is no clock input to the microphone. The high degree of frequency and phase response matching from part-to-part for the AKU2000 makes it ideal for use in microphone array applications where multiple microphones will be used to perform noise cancellation and/or beamforming.
The AKU2000 comes in a 4mm x 4mm footprint, making them the smallest footprint available for undermount, surface-mountable microphones and is lead-free surface-mount compatible.
“The AKU2000 has been designed to enable growing classes of voice-enabled applications in notebook PCs and other digital media devices,” said Dr. Ken Gabriel, co-founder and CTO, Akustica, Inc. “Featuring small footprints, digital output, and well-matched microphones ideally suited to microphone arrays, these Microphone Chips deliver the voice quality for widespread adoption and use in many voice-based applications.”
The AKU2000 is sampling now and is priced at $3.87 per unit in 1,000 piece quantities.
Founded in 2001, Akustica, Inc. is a privately held company based in Pittsburgh, PA. Through a revolutionary technology known as Sensory Silicon, Akustica products enable electronic devices to sense and respond to the world around them. By leveraging standard CMOS processes and MEMS technology, Akustica acoustic system-on-chip solutions combine the functionality of microphones with microelectronics and software onto a single chip. Only Akustica’s Microphone Chips—which were pioneered by Dr. Ken Gabriel during his tenure at Carnegie Mellon University—enable single-chip solutions with arrays of transducers and integrated signal processing that disrupt both conventional microphone and speaker technologies. Smaller and more reliable than the current crop of ECMs, silicon microphones can be customized with advanced sound capture features and noise reduction capabilities.
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