Description
The RAK18040 is a stereo analog microphone to I2S module based on the Nuvoton NAU85L40B Audio ADC which extends the WisBlock system with sound sensing capability.
The RAK18040 allows a user to connect two analog microphones into a WisBlock System.
The RAK18040 can be used in applications such as audio sensing, audio recording and more specialized.
Features
- Analog microphone input to I2S
- Samples rates from 8 kHz to 96 kHz at 24bit resolution
- 92 dB THD+N
- 101 dB(A) signal-to-noise ratio
- I2C control interface
- Size 15mmx 25mm
Specifications:
| Product Name |
RAK18040 Analog Microphone to I2S Module |
| Chipset |
Nuvoton NAU85L40B Audio ADC |
| Module Type |
Analog Microphone to I2S Converter |
| System |
WisBlock Audio Series |
| Function |
Converts analog microphone signal to digital I2S audio |
| Audio ADC |
24-bit Sigma-Delta ADC |
| Microphone Support |
2 Analog Microphones |
| Audio Interface |
I2S |
| Control Interface |
I2C |
| Sample Rate |
8 kHz to 96 kHz |
| Resolution |
24-bit |
| Signal-to-Noise Ratio (SNR) |
101 dB(A) |
| THD+N |
Up to 92 dB |
| Microphone Preamplifier |
Integrated |
| Frequency Locked Loop (FLL) |
Integrated |
| Power Source |
WisBlock Base supply |
| USB/POE Supply (VBUS) |
2.9V – 5.5V |
| Battery Supply (VBAT) |
3.3V – 4.25V |
| Digital Supply Voltage |
3.0V – 3.6V |
| Microphone Bias Voltage |
2.1V – 2.8V |
| Audio Output |
I2S digital audio stream |
| Module Size |
25 mm × 35 mm |
| Application |
Audio sensing, recording, voice recognition, IoT sound monitoring |
| Package Contents |
RAK18040 module, screws, mic connectors |
| Operating Role |
Audio front-end for WisBlock system |
