CC400-RTR2 datasheet(15/31 Pages) TI

15 / 31 page

CC400

SWRS050

Page 15 of 32

Item

Description

C10

1 nF, X7R, 0603

C11

33 nF, X7R, 0603

C12

4.7 nF, NP0, 1206

C24

33 pF, NP0, 0603

C25

220 pF, NP0, 0603

C51

220 pF, NP0, 0603

C61

12 pF, NP0, 0603

C91

4.7 pF, NP0, 06035

C92

8.2 pF, NP0, 0603

C93

3.9 pF, NP0, 0603

C121

33 nF, X7R, 0603

C122

1.5 nF, X7R, 0603

C123

330 pF, NP0, 0603

C161

15 pF, NP0, 0603

C151

15 pF, NP0, 0603

C210

1 nF, X7R, 0603

C211

33 nF, X7R, 0603

L51

39 nH, 0805

L61

6.8 nH, 0805

L91

10 nH, 0805

10 k

Ω, 0603 (optional)

R121

5.6 k

Ω, 0603

R122

27 k

Ω, 0603

R123

22 k

Ω, 0603

VAR

KV1837K, TOKO or similar

XTAL

12 MHz crystal, 12 pF load

Table 11: Bill of materials for the application circuit.

17.

Receiver sensitivity

The receiver sensitivity depends on which

IF frequency and IF filter that has been

selected (60, 200 or 455 kHz). It also

depends on the data rate (0.3 – 9.6 kbps)

and the FSK frequency separation (0 –

200 kHz). Frequency separation is twice

the frequency deviation (for example, 20

kHz separation is +/-10 kHz deviation).

Some typical figures are shown in Table

12.

Data rate

IF frequency

Separation

CC400

60 kHz

20 kHz

-110 dBm

200 kHz

40 kHz

-103 dBm

1.2 kbps

455 kHz ext

12 kHz

-108 dBm

60 kHz

30 kHz

-110 dBm

200 kHz

40 kHz

-103 dBm

2.4 kbps

455 kHz ext

20 kHz

-103 dBm

200 kHz

40 kHz

-101 dBm

4.8 kbps

455 kHz ext

20 kHz

-99 dBm

9.6 kbps

200 kHz

40 kHz

-97 dBm

Table 12: Sensitivity for different IF frequency, data rates and separation.

In a narrow band system with very low

frequency separation (less than 10 kHz)

the sensitivity will drop. To insure proper

operation the separation should always be

larger than 5 kHz (+/- 2.5 kHz deviation).

For even smaller separation, or to improve

the sensitivity, an external narrow band

demodulator

should

used.

See

Application Note AN005 “Selecting system

parameters and system configurations

using

CC400

CC900”

for

information on narrow band systems.

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