User's Guide

LM940 HW Design Guide
1VV0301352 Rev. 2 Page 7 of 68 2017-07-19
Using the Temperature Monitor Function ..................................... 44
7. RF SECTION ................................................................................ 45
Antenna requirements .................................................................. 45
Main Antenna Requirements ........................................................ 45
Antenna Diversity Requirements .................................................. 45
GNSS Receiver ............................................................................ 46
7.4.1. GNSS RF Front End Design......................................................... 46
Antenna connection ...................................................................... 47
7.5.1. Antenna Connector ...................................................................... 47
7.5.2. Antenna Cable .............................................................................. 48
7.5.3. Antenna Installation Guidelines .................................................... 48
8. AUDIO SECTION ......................................................................... 50
Audio Interface ............................................................................. 50
Digital Audio ................................................................................. 50
9. MECHANICAL DESIGN............................................................... 51
General ......................................................................................... 51
Finishing & Dimensions ................................................................ 51
Drawing ........................................................................................ 51
10. APPLICATION GUIDE ................................................................. 52
Debug of the LM940 Module in Production .................................. 52
Bypass Capacitor on Power Supplies .......................................... 52
EMC Recommendations .............................................................. 53
11. PACKAGING ............................................................................... 56
Tray .............................................................................................. 56
12. CONFORMITY ASSESSMENT ISSUES ..................................... 58
Approvals ..................................................................................... 58
Declaration of Conformity ............................................................. 58
FCC certificates ............................................................................ 58
IC certificates ................................................................................ 58
FCC/IC Regulatory notices ........................................................... 58
13. SAFETY RECOMMENDATIONS ................................................. 62
READ CAREFULLY ..................................................................... 62
14. REFERENCE TABLE OF RF BANDS CHARACTERISTICS ..... 63
15. ACRONYMS ................................................................................ 65