Installation Instructions
Table Of Contents
- Contents
- List of Table
- List of Figures
- 1 About this document
- 2 Product Overview
- 3 Mechanical Dimensions
- 4 Interface description
- 4.1 Pin Definition
- 4.2 Operating conditions
- 4.3 Digital logic characteristics
- 4.4 Power interface
- 4.5 USIM card interface
- 4.6 PCM interface
- 4.7 USB2.0 interface
- 4.8 UART interface
- 4.9 SPI interface
- 4.10 I2C interface
- 4.11 Network light
- 4.12 System Status Indication
- 4.13 Flight Mode
- 4.14 Forced USB download interface
- 4.15 SD card interface
- 4.16 SDIO_WIFI/EMMC interface
- 4.17 PCIe interface
- 4.18 RMII/RGMII interface
- 4.19 AUDIO interface
- 4.20 ADC
- 4.21 GPIOs
- 4.22 Power on/off and reset interface
- 4.23 Antenna interface
- 5 Product characteristics
- 6 Design Guideline
- 7 Storage, Production and Package
- 8 Safety Information
- 空白页面
- 空白页面
L508 Hardware Design
Copyright© Shanghai Mobiletek Communication Ltd 67
L508 module provides one analog audio input channel and one analog output channel. The output
channel is (Class-AB): THD<-85dB@32-ohm loading
4.19.1 Pin Description
Table 34 AUDIO interface definitions
Pin No. Pin Name I / O type Functional description
27 MICN AI Microphone negative input
29 MICP AI Microphone1 positive input
31 RECN AO Receiver negative output
32 RECP AO Receiver positive output
4.19.2 AUDIO reference design
The MIC channel has been biased up inside the module. MIC and REC should carry out differential
wiring and do a good job of isolation and protection.
1
2
＋
MODULE
47pF
－
MICP
MICN
100pF
47pF
BEAD
BEAD
MIC
Figure 36 Electret microphone reference design