CC1050SLASHT datasheet(27/40 Pages) TI

27 / 40 page

CC1050

SWRS044

Page 27 of 40

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.

A Pi-type filter topology is shown in Figure

17. Component values are given in Table

5. The filter is designed for 50

Ω

terminations. The component values may

have to be tuned to compensate for layout

parasitics.

A T-Type LC filter can be used to further

attenuate harmonics if the Pi-type filter is

not sufficient. A T-type filter provides much

better stop-band attenuation than a Pi-

type filter due to improved insulation

between input and output. For more

details refer to Application Note AN028 LC

Filter

with

Improved

High-Frequency

Attenuation available from the Chipcon

web

site.

L71

C71

C72

L71

C71

C72

Figure 17. LC filter

Item

315 MHz

433 MHz

868 MHz

915 MHz

C71

30 pF

20 pF

10 pF

C72

30 pF

20 pF

10 pF

L71

15 nH

12 nH

5.6 nH

4.7 nH

Table 5. LC filter component values

Not Recommended for New Designs

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