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 77
● LTE (1GHz<F<2GHz) <0.9dB
● LTE (2GHz<F) <1.2dB
The antenna feed point definition is shown in the following table:
Table 41 antenna interface definitions
Pin No. Pin Name I / O type Functional description
59 ANT_DRX AI Diversity antenna
79 GNSS_ANT AI GPS antenna
82 ANT_MAIN AI，AO Main antenna
4.23.2 Interface application
To facilitate antenna tuning and authentication testing, RF connectors and antenna matching circuits
should be added. The following are recommended circuits:
0Ω
0Ω
NC
NC
MODULE
MAIN_ANT
RF connector Matching circuit
R1
R2
L1
L2
Figure 43 Main antenna matching circuit schematic
In figure, components R1, L1, L2, and R2 are used for antenna matching, and the value of the
components depends on the antenna being debugged. By default, R1, R2 are 0 ohms resistors, and
L1, L2 are reserved for debugging. The RF connectors shown in this figure are used for RF