CC1010-RTY1 datasheet(128/150 Pages) TI2

Teilenummer	CC1010-RTY1

Bauteilbeschribung	Single Chip Very Low Power RF Transceiver with 8051-Compatible Microcontroller

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CC1010

SWRS047A

Page 128 of 146

17.22 Optional LC Filter

An optional low-pass 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 44.

Component values are given in Table 38.

The

filter

designed

for

Ω

terminations. The component values may

have to be tuned to compensate for layout

parasitics.

The design equations for a 3dB equal

ripple filter are:

⎟

⎠

⎞

⎜

⎝

⎛

−

⋅

≈

1333

067

where

c is the cut-off frequency and fRF is

the transmitted RF frequency.

L71

C71

C72

L71

C71

C72

Figure 44. LC Filter

Item

315 MHz

434 MHz

869 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 38. LC Filter component values

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