Specifications
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 Pad Assignment
- 2.1.2 Signal Properties
- 2.1.3 USB Interface
- 2.1.4 Serial Interface ASC0
- 2.1.5 Serial Interface ASC1
- 2.1.6 Inter-Integrated Circuit Interface
- 2.1.7 UICC/SIM/USIM Interface
- 2.1.8 Enhanced ESD Protection for SIM Interfaces
- 2.1.9 Digital Audio Interface
- 2.1.10 Analog-to-Digital Converter (ADC)
- 2.1.11 RTC Backup
- 2.1.12 GPIO Interface
- 2.1.13 Control Signals
- 2.1.14 JTAG Interface
- 2.1.15 eMMC Interface
- 2.2 GSM/UMTS/LTE Antenna Interface
- 2.3 GNSS Antenna Interface
- 2.4 Sample Application
- 2.1 Application Interface
- 3 GNSS Interface
- 4 Operating Characteristics
- 5 Mechanical Dimensions and Mounting
- 6 Regulatory and Type Approval Information
- 7 Document Information
- 8 Appendix
Cinterion
®
ALAS5V Hardware Interface Description
2.2 GSM/UMTS/LTE Antenna Interface
67
ALAS5V_HID_v00.030a 2019-03-20
Confidential / Preliminary
Page 52 of 124
2.2.3.2 Routing Examples
Interface to RF Connector
Figure 19 shows a sample connection of a module‘s antenna pad at the bottom layer of the
module PCB with an application PCB‘s coaxial antenna connector. Line impedance depends
on line width, but also on other PCB characteristics like dielectric, height and layer gap. The
sample stripline width of 0.40mm is recommended for an application with a PCB layer stack
resembling the one of the ALAS5V evaluation board. For different layer stacks the stripline
width will have to follow stripline routing rules, avoiding 90 degree corners and using the short-
est distance to the PCB’s coaxial antenna connector.
Figure 19: Routing to application‘s RF connector
e.g.
ANT_
MAIN
G N D
G N D
Edge of module PCB
Stripline (50 ohms) on top
layer of evaluation board from
antenna pad to module edge
Width = 0.40 mm
E.g., U.FL antenna
connector
50 ohms microstrip line
G N D G N D
Ground connection