TDK claims lowest power PDM microphone

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TDK’s T3902 PDM microphone is an ultra-low-power and low noise MEMS microphone for mobile, IoT, and other consumer devices, housed in a small 3.5 x 2.63 x 0.98-mm package

By Gina Roos, editor-in-chief

TDK Corp. has launched the InvenSense T3902, touted as the lowest power pulse density modulation (PDM) microphone for mobile, IoT, and other consumer devices. The low-noise T3902 multi-mode bottom-port MEMS microphone consumes 185 µA in ultra-low-power mode and 12 µA in sleep mode. The Always-On functionality in low power mode enables immediate accessibility on wake command.

Suitable for a variety of consumer devices, including wearables, tablets, smart TVs, and remote controls, the T3902 microphone is housed in a 3.5 mm x 2.65 mm x 0.98 mm package. Other key specs include a high SNR of 64.5 dB, a high acoustic overload point (AOP) of 120 dB, and an extended frequency response from 36 Hz to >20 kHz. It supports far-field communication for video and phone conference and enables clear audio capture in loud environments.

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The reduced power consumption is especially critical to wearable and IoT designs where reduced board space and battery size are key factors to enabling a small form factor as well as providing a flexible and low-power Always-On system design, said TDK.

The InvenSense T3902 is available from TDK’s global distributors. The microphone is compatible with Sn/Pb and Pb‐free solder processes and is RoHS/WEEE compliant. Visit here for more information about TDK’s microphone products.