Vesper unveils first piezoelectric digital MEMS microphone
The VM3000, says the company, greatly expands the number of applications that can be serviced with piezoelectric MEMS microphones, including smartphones, automobiles, laptops, and smart speakers. The high-performance, low-power microphone features an ultra-fast startup of less than 200 microseconds and is offered as delivering superior performance in all environments.
“The VM3000 is our first digital microphone and will allow Vesper’s piezoelectric MEMS to be used in a very broad range of applications and be paired with virtually any audio chip,” says Matt Crowley, CEO of Vesper. “It will be especially useful for large arrays, physically large systems and situations where there is a lot of RF interference. This proves Vesper can develop complex high performance application-specific integrated circuits (ASICs) to pair with our disruptive MEMS technology.”
The VM3000 features a pulse density modulation (PDM) output, enabling the multiplexing of two microphones on a single data line. It also offers a high immunity to radio-frequency interference (RFI) and electromagnetic-interference (EMI), giving designers more flexibility in how the microphones are positioned and the routing in their wire systems.
The device’s fast startup allows systems to wake up fast enough to capture entire keywords and, says the company, has demonstrated up to a 2X improvement in keyword accuracy when used in combination with the company’s ZeroPower Listening technology. The fast startup also eliminates the need to keep microphones in standby mode, thereby further saving power.
The VM3000 has a typical signal-to-noise ratio (SNR) of 63 db dB at 1kHz signal and offers an acoustic overload point (AOP) of 122 db sound pressure level (SPL). It features an industry standard 3.5 mm x 2.65 mm footprint and is reflow solder-compatible with no sensitivity degradation.
The VM3000 is currently volume sampling and will be in mass production in Q4 2019.
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