Audio is a critical part of modern electronics. Whether it is headphones cancelling out background noise or a smart speaker recognising voice commands, engineers need microphones that are both accurate and efficient. Add in the challenge of fitting these components into increasingly compact devices, and the choice of microphone can make or break a design.
Infineon has introduced two new digital microphones, the IM72D128V and IM69D129F, to extend its XENSIV™ MEMS microphone family. Both use the company’s Sealed Dual Membrane (SDM) technology, which protects against dust and water ingress to IP57 levels without degrading sound performance.
Two Devices for Different Design Goals
The IM72D128V is aimed at applications where noise performance is a priority. It achieves a 71.5 dB(A) signal-to-noise ratio and draws just 430 µA in high-performance mode. Switching to low-power mode brings that down to 160 µA, which can have a big impact on battery life in portable products.
For designs where space is tight, the IM69D129F offers a smaller 3.5 × 2.65 × 0.98 mm³ footprint while still delivering a 69 dB(A) SNR. This device is well suited for arrays of microphones used in ANC earbuds, laptops, or compact conference units where multiple elements are needed for beamforming.
Built for Arrays and Integration
Both microphones share the same flat frequency response from 11 Hz upward and have a ±1 dB sensitivity tolerance. This makes it easier for engineers to design matched arrays where phase and amplitude consistency are critical. Each device also integrates a low-noise preamplifier and sigma-delta ADC to provide a clean digital PDM output that can connect directly to modern DSPs or SoCs.
Expanding the Range of Applications
Although consumer audio is a clear target, Infineon is positioning these microphones for more than just earbuds and laptops. Their IP57 rating and compliance with IEC and JEDEC reliability standards make them suitable for industrial monitoring, smart home devices, and even automotive infotainment or voice-control modules.
For engineers working on voice-enabled products, these microphones provide a way to achieve clear capture, consistent array behaviour, and longer battery life without sacrificing environmental robustness.
Learn more and read the original article on www.infineon.com
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