User's Manual

UE910 3G HARDWARE USER GUIDE 1vv0301171 Rev.3 • 2015-04-17 6 of 78
Reproduction forbidden without Telit Communications PLC written authorization – All Rights Reserved
MODEM SERIAL PORT 1 (USIF0) 42
MODEM SERIAL PORT 2 (USIF1) 44
RS232 LEVEL TRANSLATION 45
5.6 General Purpose I/O 46
Using a GPIO as INPUT 47
Using a GPIO as OUTPUT 47
Indication of network service availability 48
5.7 External SIM Holder 49
5.8 ADC Converter 49
6 RF Section 50
6.1 Bands Variants 50
6.2 TX Output Power 50
6.3 RX Sensitivity 50
6.4 Antenna Requirements 51
PCB design guidelines 51
PCB Guidelines in case of FCC Certification 53
Transmission line design 53
Transmission Line Measurements 54
Antenna Installation Guidelines 56
7 Audio Section 57
7.1 Overview 57
7.2 Analog Voice Interface 57
MIC connection 58
LINE IN Connection 60
EAR Connection 61
7.3 Digital Voice Interface 62
CODEC Examples 62
8 Mechanical Design 63
8.1 Drawing 63
9 Application Design 64
9.1 Footprint 64
9.2 PCB pad design 65
9.3 PCB pad dimensions 65
9.4 Stencil 67
9.5 Solder paste 67
9.6 Solder reflow 67