Adafruit 3492 PDM MEMS Microphone Breakout
The Adafruit 3492 is a compact MEMS microphone module based on PDM technology (Pulse Density Modulation), suitable for sound recording, speech recognition, IoT devices, and microcontroller-based projects. Unlike traditional analog microphones, the module produces a digital PDM signal, enabling interference-free data transmission and easy connection to modern microcontrollers.
The module uses the high-quality STMicroelectronics MP34DT01-M MEMS microphone, whose low power consumption and good signal-to-noise ratio make it an excellent choice for sound measurement and analysis. It is especially suitable for platforms with built-in PDM support, such as many ARM Cortex-M based microcontrollers.
Features
- Digital PDM output (Pulse Density Modulation)
- Based on the STMicroelectronics MP34DT01-M MEMS microphone
- Operating voltage 1.8–3.3 VDC
- Low power consumption, typically around 0.6 mA
- Signal-to-noise ratio (SNR) 61 dB
- Small and lightweight breakout board
- Includes a pin header for soldering
- Suitable for Arduino-, RP2040-, ESP32- and SAMD-based projects
Typical applications
- Voice-controlled devices
- Volume and noise level monitoring
- IoT and smart home solutions
- Audio analysis and signal processing
- Robotics
- Voice-controlled user interfaces
- Digital recording and measurement systems
Technical specifications
- Microphone type: MEMS
- Output: PDM (Pulse Density Modulation)
- Operating voltage: 1.8–3.3 VDC
- Clock frequency: 1–3.25 MHz
- Power consumption: about 0.6 mA
- SNR: 61 dB
- Sensitivity: about -26 dBFS
- Dimensions: approximately 14 × 12.8 × 2.8 mm
The Adafruit 3492 offers an easy way to add a high-quality digital microphone to electronics and embedded system projects that require reliable sound capture in a small form factor.
