Data Sheet

Silicon Labs
13
RF Characteristics ................................................................................................................................. 32
14 Physical dimensions .............................................................................................................................. 34
15 Layout guidelines ................................................................................................................................... 35
15.1 WF121-E ............................................................................................................................................ 35
15.2 WF121-N............................................................................................................................................ 35
15.3 WF121-A ............................................................................................................................................ 36
15.4 Thermal considerations ..................................................................................................................... 37
15.5 EMC considerations ........................................................................................................................... 37
16 Soldering recommendations .................................................................................................................. 39
17 Certifications .......................................................................................................................................... 40
17.1 CE ...................................................................................................................................................... 40
17.2 FCC and IC ........................................................................................................................................ 40
17.2.1 FCC et IC ................................................................................................................................... 42
18 Qualified Antenna Types for WF121-E .................................................................................................. 45