CC1021_12 datasheet(20/94 Pages) TI

Part #	CC1021

Description	Single Chip Low Power RF Transceiver for Narrowband Systems

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CC1021

SWRS045C

Page 20 of 87

The LC filter in Figure 3 is inserted in the

TX path only. The filter will reduce the

emission of harmonics and the spurious

emissions in the TX path. An alternative is

to insert the LC filter between the antenna

and the T/R switch as shown in Figure 4.

The filter will reduce the emission of

harmonics and the spurious emissions in

the TX path as well as increase the

receiver selectivity. The sensitivity will be

slightly reduced due to the insertion loss of

the LC filter.

1

PCLK

PDI

PDO

DGND

DCLK

DIO

DVDD

2

3

4

6

5

7

8

CC1020

24

VC

AVDD

RF_OUT

RF_IN

AVDD

R_BIAS

AVDD

23

22

21

19

20

18

17

C4

C5

XTAL

LC Filter

Monopole

antenna

(50 Ohm)

L2

C3

AVDD=3V

L1

C1

R1

AVDD=3V

DVDD=3V

AVDD=3V

C7

R3

C8

C6

R2

AVDD=3V

T/R Switch

C60

R10

1

PCLK

PDI

PDO

DGND

DCLK

DIO

DVDD

2

3

4

6

5

7

8

CC1020

24

VC

AVDD

RF_OUT

RF_IN

AVDD

R_BIAS

AVDD

23

22

21

19

20

18

17

C4

C5

XTAL

LC Filter

Monopole

antenna

(50 Ohm)

L2

C3

AVDD=3V

L1

C1

R1

AVDD=3V

DVDD=3V

AVDD=3V

C7

R3

C8

C6

R2

AVDD=3V

T/R Switch

C60

R10

Figure 4. Alternative application circuit (power supply decoupling not shown)

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CC1021 Datasheet(PDF) 20 Page - Texas Instruments

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