Summary of TINY MEMS MICROPHONE FEATURES 185ΜA ULTRA-LOW POWER MODE
The InvenSense T3902 from TDK Corporation is a bottom-port MEMS PDM microphone designed for mobile, wearable, and IoT devices, emphasizing ultra-low power. It provides a 185 µA low-power AlwaysOn mode (12 µA sleep), 64.5 dB SNR, 120 dB AOP, and extended 36 Hz–>20 kHz frequency response in a compact 5 × 2.65 × 0.98 mm SMD package, enabling small form-factor designs and flexible low-power system integration.
Parts used in the T3902 Microphone Project:
- InvenSense T3902 MEMS microphone (bottom-port, PDM)
- Surface-mount package 5 × 2.65 × 0.98 mm
- Power supply supporting low-power and sleep modes
- PCB compatible with Sn/Pb and Pb-free solder processes
- System wake command interface for AlwaysOn functionality
- Audio processing or host MCU compatible with PDM output
The InvenSense T3902 is what TDK Corporation claims to be the world’s lowest power Pulse Density Modulation (PDM) microphone for mobile, IoT and other consumer devices.
The multi-mode bottom-port MEMS microphone offers an exceptionally efficient 185µA ultra-low power mode, high SNR of 64.5 dB, and high Acoustic Overload Point (AOP) of 120 dB in a 3.5×2.65×0.98mm package. The microphone’s AlwaysOn functionality in low-power mode enables immediate accessibility upon wake command. TDK’s new T3902 microphone enables OEM partners to differentiate their product offerings by improving the consumer experience with reduced power consumption. This 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 efficient (low power AlwaysOn) system design.
Key features
- 5 × 2.65 × 0.98 mm surface‐mount package
- Low power: 185 µA in Low‐Power Mode
- Extended frequency response from 36 Hz to >20 kHz
- Sleep Mode: 12 µA
- High power supply rejection (PSR): −97 dB FS
- Fourth‐order Σ‐Δ modulator
- Digital pulse density modulation (PDM) output
- Compatible with Sn/Pb and Pb‐free solder processes
- RoHS/WEEE compliant
Read more: TINY MEMS MICROPHONE FEATURES 185ΜA ULTRA-LOW POWER MODE
- What is the low-power current consumption of the T3902?
The T3902 consumes 185 µA in Low-Power Mode. - Does the T3902 support a sleep mode?
Yes, the T3902 has a Sleep Mode consuming 12 µA. - What is the signal-to-noise ratio (SNR) of the T3902?
The T3902 has an SNR of 64.5 dB. - What acoustic overload point (AOP) does the T3902 provide?
The T3902 provides an AOP of 120 dB. - What output format does the T3902 use?
The T3902 uses digital pulse density modulation (PDM) output. - What frequency response range does the T3902 offer?
The T3902 offers an extended frequency response from 36 Hz to greater than 20 kHz. - What are the package dimensions of the T3902?
The T3902 is packaged in a 5 × 2.65 × 0.98 mm surface-mount package. - Is the T3902 compatible with Pb-free solder processes?
Yes, the T3902 is compatible with both Sn/Pb and Pb-free solder processes. - Does the T3902 support AlwaysOn functionality?
Yes, the T3902 supports AlwaysOn functionality in low-power mode for immediate accessibility upon wake command. - Is the T3902 compliant with RoHS/WEEE?
Yes, the T3902 is RoHS and WEEE compliant.
