CC1000
SWRS048A Page 36 of 55
25. Optional LC Filter
An optional LC filter may be added
between the antenna and the matching
network in certain applications. The filter
will reduce the emission of harmonics and
increase the receiver selectivity.
The filter topology is shown in Figure 25.
Component values are given in Table 13.
The filter is designed for 50
Ω
terminations. The component values may
have to be tuned to compensate for layout
parasitics.
L71
C71
C72
L71
C71
C72
Figure 25. LC filter
Item
315 MHz
433 MHz
868 MHz
915 MHz
C71
30 pF
20 pF
10 pF
10 pF
C72
30 pF
20 pF
10 pF
10 pF
L71
15 nH
12 nH
5.6 nH
4.7 nH
Table 13. LC filter component values