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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

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 57 58

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