Description
The RAK18032 is a mono PDM microphone module based on the Knowles SPH0655LM4H-1 which extends the WisBlock system with sound sensing capability.
The RAK18032 is a digital microphone module that converts analog audio to digital PDM signals. It supports left and right channels through a GPIO signal.
The RAK18032 can be used in applications such as audio sensing and audio recording.
Features
- PDM microphone
- Frequency Response 20 - 80kHz
- Low Distortion of 0.2% at 94dB SPL
- 64 dB(A) signal-to-noise ratio
- Omnidirectional sensitivity
- Size 15mmx 25mm
Specifications:
| Product Name |
RAK18032 PDM Ultrasonic Microphone Sensor |
| Microphone Chip |
Knowles SPH0655LM4H-1 |
| Module Type |
PDM Ultrasonic Microphone Module |
| System |
WisBlock Audio Series |
| Function |
Converts analog sound to digital PDM audio |
| Audio Output |
PDM (Pulse Density Modulation) |
| Channel |
Mono microphone |
| Channel Selection |
Left or Right via GPIO |
| Frequency Response |
20 kHz – 80 kHz (Ultrasonic range) |
| Sensitivity Type |
Omnidirectional |
| Distortion |
0.2% at 94 dB SPL |
| Signal-to-Noise Ratio |
64 dB(A) |
| Output Type |
Digital audio stream |
| Power Supply |
3.3V – 3.6V |
| Current Consumption |
40 µA – 690 µA |
| Port Type |
Bottom port MEMS microphone |
| Audio Processing |
PDM digital output |
| Module Size |
15 mm × 25 mm |
| Mounting |
WisBlock Base connector |
| Application |
Ultrasonic sensing, audio monitoring, voice detection, sound recording, IoT audio |
| Package Contents |
RAK18032 module, screws |
| Integration |
Works with WisBlock Core and Base board |
