CC1050_15 datasheet(9/40 Pages) TI1

Part #	CC1050

Description	Single Chip Very Low Power RF Transmitter

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CC1050

SWRS044

Page 9 of 40

Application Circuit

Very few external components are

required for the operation of CC1050. A

typical application circuit is shown Figure

2. Component values are shown in Table

1.

Output matching

C1, C2 and L2 are used to match the

transmitter to 50

Ω. See Output Matching

p.24 for details.

VCO inductor

The VCO is completely integrated except

for the inductor L1. For further details see

p. 17.

Component values for the matching

network and VCO inductor are easily

calculated using the SmartRF

® Studio

software.

Crystal oscillator

C3 and C4 are the loading capacitors for

the crystal. See page 26 for details.

Additional filtering

Additional filtering (e.g. a low pass LC-

filter) may be used in order to reduce the

harmonic emission. See also Optional LC

Filter p.27 for further information.

Power supply decoupling and filtering

must be used (not shown in the

application circuit). The placement and

size of the decoupling capacitors and the

power supply filtering are very important to

achieve

the

optimum

performance.

Chipcon provides a reference design

(CC1050EB) that should be followed very

closely.

Figure 2. Typical

CC1050 application circuit

LC filter

11

12

RF_OUT

AGND

L1

AVDD

L2

R_BIAS

CHP_OUT

AGND

PALE

PDATA

PCLK

DCLK

DI

DVDD

DGND

AGND

XOSC_ Q1

AGND

XOSC_ Q2

AVDD

L1

1

3

2

4

5

6

8

9

10

7

24

23

22

20

21

19

18

17

15

14

13

16

C4

C3

Antenna

(50 Oh m)

AVDD=3V

DVDD=3V

Optional

XTA L

NC

L2

C1

C2

AVDD=3V

R1

DGND

AVDD

Not Recommended for New Designs

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