Adafruit 3492 PDM MEMS Microphone Breakout

The Adafruit 3492 is a compact MEMS microphone module based on PDM technology (Pulse Density Modulation), suitable for audio recording, speech recognition, IoT devices, and microcontroller-based projects. Unlike traditional analog microphones, the module produces a digital PDM signal, enabling noise-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 audio 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 STMicroelectronics MP34DT01-M MEMS microphone
• Operating voltage 1,8–3,3 VDC
• Low power consumption, typically about 0,6 mA
• Signal-to-noise ratio (SNR) 61 dB
• Small and lightweight breakout board
• Includes pin header for soldering
• Suitable for Arduino-, RP2040-, ESP32- and SAMD-based projects

Typical applications

• Voice-controlled devices
• Monitoring of volume and noise levels
• 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: about 14 × 12,8 × 2,8 mm

The Adafruit 3492 provides an easy way to add a high-quality digital microphone to electronics and embedded system projects that require reliable audio capture in a small form factor.