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 76
S1
MODULE
PWRKEY
EXTON1N
S2
RESET
Figure 42 PWRKEY/RESET reference circuit
4.23 Antenna interface
4.23.1 RF signal PCB layout guide
The L508 module provides the RF antenna interface on the LCC pad. The antenna signal line can be
matched through a microstrip line or other type of RF line via an antenna matching T or type circuit.
The impedance must be controlled at 50 Ω。
It is recommended that the insertion loss between the antenna feed point and the antenna should
meet the following requirements:
● GSM900<0.5dB
● DCS1800 <0.9dB
● WCDMA 2100<0.9dB
● WCDMA 900<0.5 dB
● CDMA BC0<0.5 dB
● TDSCDMA 1900/2000<0.9dB
● LTE (F<1GHz) <0.5dB