User's Manual
Table Of Contents
- Introduction
- Abbreviation
- Features
- Electrical Specifications
- Host interface pin assignments
- LGA Pad Diagram
- Pin Assignments
- Power supply
- USB interface
- SGMII interface
- UIM interface
- Control interface
- Power-on Signal
- Wake-up interface
- Reset Signal
- WWAN state Signal
- Digital interface
- JTAG Interface
- SPI Master Interface
- PCM Interface
- I2S Interface
- I2C Interface
- UART Interface
- ADC Interface
- RF Specifications
- RF connections
- Interference and sensitivity
- GNSS external circuit design
- RF Specification
- 3.5.1 Band support
- 3.5.2 Bandwidth support
- 3.5.3 RF Transmit Specification
- 3.5.4 RF Receiver Specification
- 3.5.5 GNSS Receiver Specification
- Power
- Power consumption
- Software Interface
- Support tools
- USB interface
- Mechanical and Environmental Certifications
- PCBA Form Factor
- Reflow
- PCB pad design
- Labeling
- SMT Voids control
- Mother board PCB thickness
- Stencil design
- Thermal considerations
- Regulatory Compliance and Certification
- Certification testing
- Packaging
- Tape-and-Reel Package
- Single Packaging for Samples
- MSL level
- Safety Recommendation
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HW Design Guidelines
Figure 16. RF pad layout suggestion
Figure 17. RF matching guide
3.2. Interference and sensitivity
This section includes tips to assist developers in identifying the interference that may affect
M18QF/M18QA Series modules when used in systems.
Interference from other wireless devices
–
Harmonics, inter-modulated signal generated from wireless devices that
fall in RX ranges of the modules, may result in degraded RX performance.
–
It is highly recommended to check RX performance of entire systems
within the shielding environment.
Interference from host interface
–
High-speed signal-switching elements in systems can easily couple noise
into the module (Ex.: DDR memory, LCD modules, DC-DC converter, PCM
signal).
Methods to avoid sources of interference
– Antenna location is important; we recommend directing the antenna