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 78
performance testing and should be placed close to the module's antenna pins. Line impedance
between components must be controlled at 50 ohms.
0Ω
0Ω
NC
NC
MODULE
DRX_ANT
Matching circuit
R1
R2
L1
L2
Figure 44 DRX antenna matching circuit schematic
In the image above, R1 and R2, L1 and L2 are used for diversity antenna matching. By default, R1,
R2 are 0 resistors, and L1, l2 are reserved for debugging.
Note: LTE Diversity Antennas are recommended to be retained for modules supporting diversity
reception, as there are many high-frequency TDD-LTE designs such as Band38, band40 and Band41.
Because of the high insertion loss of RF LINES, the receiving sensitivity of these bands will be greatly
affected if there is no diversity antenna.
0Ω
NC
NC
MODULE
MAIN_ANT
R1
L1
L2
GNSS_ANT
LNA