RAK18040 WisBlock Audio Analog Microphone to I2S Module Datasheet

Overview

Description

RAK18040 is an analog microphone to the I2S module, part of the WisBlock Audio Series. With an analog microphone like the RAK18041, analog audio can be directed to I2S output using this module. RAK18040 is designed based on NAU85L40B from Nuvoton. NAU85L40B is an audio ADC with an integrated frequency-locked loop (FLL) and microphone preamplifier.

Features

Module Specifications
- Audio ADC
- Integrated FLL and microphone preamplifier
- I2S interface for audio data
- I2C interface for control
- Supports two (2) analog microphones
Module Size
- 25 x 35 mm

Specifications

Overview

Figure 4131: RAK18040 WisBlock Audio Analog Microphone to I2S Module

Hardware

The hardware specification is categorized into five (5) parts. It shows the chipset of the module and discusses the pinouts and their corresponding functions and diagrams. It also covers the acoustics, electrical, and mechanical characteristics that include the tabular data of the functionalities and standard values of the RAK18040 WisBlock Audio Analog Microphone to I2S Module.

Chipset

Vendor	Part Number
Nuvoton	NAU85L40B

Pin Definition

WisBlock Connector

Figure 4132: RAK18040 WisBlock Connector pinout

Acoustic and Electrical Characteristics

This table shows the RAK18040 WisBlock Audio Analog Microphone to I2S Module electrical characteristics.

Symbol	Description	Min.	Nom.	Max.	Unit
VBUS	USB or POE supply form WisBase	2.9	5	5.5	V
VBAT	Battery supply form WisBase	3.3	-	4.25	V
3V3_S/3V3	Digital supply voltage	3	3.3	3.6	V
MICBIas	Output voltage for analog MIC	2.1	-	2.8	V
THD+N	Digital supply voltage	-	-80	-92	dB
SNR	Reference = VOUT(0 dBFS), A-Weighted, MIC Input, MIC Gain = 0 dB, fs = 8 KHz, Mono Differential Input	-	101	-	dB