This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in

white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ...

FCA246

UAA3545

1

2

3

4

5

6

7

8

RFB

TXB

TXA

RFA

9

101112

13

14

15

16

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

R11

2.2 k

Ω

C18

8.2 nF

NPO

C13

560 pF

NPO

C22

82 pF

C57

100 nF

C58

10

µF

VCC

S_EN

R_DATAP

S_CLK

XTAL

C31

1 nF

C40

4.7 nF

SLCCTR

RSSI

C44

27 pF

C46

8.2 pF

VCC

L8

6.8 nH

C41

8.2 pF

C40

8.2 pF

L10

6.8 nH

L9

6.8 nH

C43

1.5 pF

C42

1.5 pF

RF input

C33

0.82 pF

C27

0.82 pF

TX output

C28

8.2 pF

C32

8.2 pF

L6

L5

2.7 nH

L4

12 nH

L7

12 nH

C70

8.2 pF

C62

1.8 pF

C68

8.2 pF

VCC

C69

8.2 pF

C23

100 nF

C67

6.8 pF

C65

6.8 pF

C66

100 nF

T_GFSK

VCO_ON

R

470

Ω

C

8.2pF

R

470

Ω

C

8.2 pF

PA

T_PWR

ADDITIONAL

IMPLEMENTATION

Fig.6 Evaluation board schematic (mode 3 operation).

(1) S_DATA input (pin 4) is subject to latch-up if a negative voltage is applied. The application circuit should be designed to prevent this occurring.

(2) TXA and TXB outputs (pins 20 and 21) are subject to latch-up if a negative output voltage occurs. To prevent this happening, the application circuit should use a DC biasing arrangement