Use Instructions
Table Of Contents
- 1 About this document
- 2 Product Overview
- 3 Interface Description
- 3.1 PIN Definition
- 3.2 Operating condition
- 3.3 Digital I/O characteristics
- 3.4 Power Interface
- 3.5 UIM interface
- 3.6 PCM interface(TBD)
- 3.7 USB2.0 interface
- 3.8 UART Interface
- 3.9 Power on/off and reset interface
- 3.10 Interactive interface
- 3.11 Net Light interface
- 3.12 System boot configuration and download
- 3.13 Analog and Digital conversion (ADC) interface
- 3.14 I2C interface
- 3.15 SPI interface
- 3.16 Antenna interface
- 4 Product characteristics
- 5 Design guideline
- 6 Manufacturers
- 7 Package Storage information
- 8 Safety Information
L710HG Hardware Design
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3.16 Antenna interface
3.16.1 RF signal PCB layout guide
L710HG provides RF antenna interface. Customer’s antenna should be located in the host board and
connected to module’s antenna pad through micro-strip line or other types of RF trace and the trace
impedance must be controlled in 50Ω. we recommends that the total insertion loss between the
antenna pad and antenna should meet the following requirements:
● LTE (F<1GHz) <0.5dB
● LTE (1GHz<F<2GHz) <0.9dB
● LTE (2GHz<F) <1.2dB
To facilitate the antenna tuning and certification test, a RF connector and an antenna matching circuit
should be added. The following figure is the recommended circuit.
The antenna feed point is defined as shown in below table：
Table 3-21 antenna pin definition
Pin No.
Signal
I/O
Typ.
Description
18 MAIN_ANT AI/AO Module main antenna
3.16.2 applications
For convenience of antenna tuning and certification test, should increase RF connectors and the
antenna matching circuit, below is a recommended circuit
:
Figure 3-25 Main antenna matching circuit diagram（MAIN_ANT）
In this figure, the components R1, C1, C2 and R2 is used for antenna matching, the value of
components can only be got after the antenna tuning, usually, they are provided by antenna vendor. By