Specifications
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 USB Interface
- 2.1.2 Serial Interface ASC0
- 2.1.3 Serial Interface ASC1
- 2.1.4 UICC/SIM/USIM Interface
- 2.1.5 Analog Audio Interface
- 2.1.6 Digital Audio Interface
- 2.1.7 GPIO Interface
- 2.1.8 I2C Interface
- 2.1.9 SPI Interface
- 2.1.10 HSIC Interface
- 2.1.11 PWM Interfaces
- 2.1.12 Pulse Counter
- 2.1.13 Status LED
- 2.1.14 Fast Shutdown
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 2.1 Application Interface
- 3 Operating Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
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EHS6-A Hardware Interface Overview
2.2 RF Antenna Interface
22
EHS6-A_HIO_v04.000 2019-03-05
Confidential / Preliminary
Page 20 of 40
2.2.1 Antenna Installation
The antenna is connected by soldering the antenna pad (ANT_GSM, i.e., pad #59) and its
neighboring ground pads (GND, i.e., pads #58 and #60) directly to the application’s PCB. The
antenna pad is the antenna reference point (ARP) for EHS6-A. All RF data specified throughout
this document is related to the ARP.
The distance between the antenna ANT_GSM pad (#59) and its neighboring GND pads (#58,
#60) has been optimized for best possible impedance. On the application PCB, special atten-
tion should be paid to these 3 pads, in order to prevent mismatch.
The wiring of the antenna connection line, starting from the antenna pad to the application an-
tenna should result in a 50
line impedance. Line width and distance to the GND plane needs
to be optimized with regard to the PCB’s layer stack.
To prevent receiver desensitization due to interferences generated by fast transients like high
speed clocks on the application PCB, it is recommended to realize the antenna connection line
using embedded Stripline rather than Micro-Stripline technology.
For type approval purposes, the use of a 50
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 EHS6-A‘s antenna pad.