User's Manual
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 UICC/SIM/USIM Interface
- 2.1.7 Digital Audio Interface
- 2.1.8 Pulse Code Modulation Interface (PCM)
- 2.1.9 Inter IC Sound Interface (I2S)
- 2.1.10 GPIO Interface
- 2.1.11 I2C Interface
- 2.1.12 SPI Interface
- 2.1.13 Pulse Counter
- 2.1.14 HSIC Interface (ELS51-VA Only)
- 2.1.15 SDIO Interface (ELS51-VA Only)
- 2.1.16 Control Signals
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 2.1 Application Interface
- 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
Cinterion
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ELS31-VA/ELS51-VA Hardware Interface Description
2.2 RF Antenna Interface
56
ELS31-VA_ELS51-VA_HID_v01.000 2017-01-04
Confidential / Preliminary
Page 46 of 106
2.2 RF Antenna Interface
The RF interface has an impedance of 50Ω. ELS31-VA/ELS51-VA is capable of sustaining a
total mismatch at the antenna line without any damage, even when transmitting at maximum
RF power.
The external antenna must be matched properly to achieve best performance regarding radi-
ated power, modulation accuracy and harmonic suppression. Antenna matching networks are
not included on the ELS31-VA/ELS51-VA module and should be placed in the host application
if the antenna does not have an impedance of 50
Ω.
Regarding the return loss ELS31-VA/ELS51-VA provides the following values in the active
band:
2.2.1 Antenna Interface Specifications
ELS31-VA/ELS51-VA is equipped with two receiver ports. The sensitivity results according to
Table 13 are verified by using both antenna ports according to the recommendation given in
3GPP TS 36.521-1, Chapter 7.2. The sensitivity results also depend on the selected band-
width.
Table 12: Return loss in the active band
State of module Return loss of module Recommended return loss of application
Receive >
8dB > 12dB
Transmit not applicable >
12dB
Table 13: RF Antenna interface LTE
Parameter Conditions Min. Typical Max. Unit
LTE connectivity Band 4 and 13
Static Receiver input Sensi-
tivity @ ARP (ch. bandwidth
5MHz)
LTE Band 4 -99.3 -103 -- dBm
LTE Band 13 -99.3 -101 -- dBm
RF Power @ ARP with 50
Load
LTE Band 4 21 23 25 dBm
LTE Band 13 21 23 25 dBm