User's Manual
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 3 Operating Characteristics
- 3.1 Operating Modes
- 3.2 Power Up/Power Down Scenarios
- 3.3 Power Saving
- 3.4 Power Supply
- 3.5 Operating Temperatures
- 3.6 Electrostatic Discharge
- 3.7 Blocking against RF on Interface Lines
- 3.8 Reliability Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
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ELS61-AUS Hardware Interface Description
2.2 RF Antenna Interface
52
ELS61-AUS_HID_v00.031 2016-06-03
Confidential / Preliminary
Page 43 of 102
2.2.2 Antenna Installation
The antenna is connected by soldering the antenna pad (ANT_MAIN or ANT_DRX) and its
neighboring ground pads (GND) directly to the application’s PCB. The antenna pads are the
antenna reference points (ARP) for ELS61-AUS. All RF data specified throughout this docu-
ment is related to the ARP.
Figure 20: Antenna pads (bottom view)
The distance between the antenna pad and its neighboring GND pads has been optimized for
best possible impedance. To prevent mismatch, special attention should be paid to these pads
on the application‘s PCB.
The wiring of the antenna connection, starting from the antenna pad to the application‘s anten-
na should result in a 50
Ω line impedance. Line width and distance to the GND plane needs to
be optimized with regard to the PCB’s layer stack. Some examples are given in Section 2.2.3.
To prevent receiver desensitization due to interferences generated by fast transients like high
speed clocks on the external application PCB, it is recommended to realize the antenna con-
nection line using embedded Stripline rather than Micro-Stripline technology. Please see Sec-
tion 2.2.3.1 for examples of how to design the antenna connection in order to achieve the
required 50
Ω line impedance.
For type approval purposes, the use of a 50
Ω coaxial antenna connector (U.FL-R-SMT) might
be necessary. In this case the U.FL-R-SMT connector should be placed as close as possible
to ELS61-AUS‘s antenna pad.
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GND
GND
ANT_MAIN
GND
ANT_DRX