CC1021-RTR1 datasheet(32/92 Pages) TI

32 / 92 page

CC1021

SWRS045

Page 32 of 91

to the transmitter. This information can

also be used for an automatic frequency

control (AFC) as described in section

12.13.

Digital filtering

Average

filter

Data

filter

Decimator

Frequency

detector

Data slicer

comparator

Bit

synchronizer

and data

decoder

Figure 13. Demodulator block diagram

12.4. Receiver Sensitivity versus Data Rate and Frequency Separation

The receiver sensitivity depends on the

channel filter bandwidth, data rate, data

format, FSK frequency separation and the

RF frequency. Typical figures for the

receiver sensitivity (BER = 10 3) are

shown in Table 19 and Table 20 for FSK.

For best performance, the frequency

deviation should be at least half the baud

rate in FSK mode.

The sensitivity is measured using the

matching network shown in the application

circuit in Figure 3, which includes an

external T/R switch.

Refer

Application

Note

AN029

CC1020/1021 AFC for plots of sensitivity

versus frequency offset.

Sensitivity [dBm]

Data rate

[kBaud]

Deviation

[kHz]

Filter BW

[kHz]

NRZ

mode

Manchester

mode

UART

mode

4.8

± 4.95

38.4

-109

-112

-109

19.2

± 9.9

51.2

-107

-108

-107

19.2

± 19.8

102.4

-104

-106

-104

38.4

± 19.8

102.4

-104

76.8

± 36.0

153.6

-101

153.6

± 72.0

307.2

-96

-97

-96

Table 19. Typical receiver sensitivity as a function of data rate at 433 MHz, FSK

modulation, BER = 10 3, pseudo-random data (PN9 sequence).

Sensitivity [dBm]

Data rate

[kBaud]

Deviation

[kHz]

Filter BW

[kHz]

NRZ

mode

Manchester

mode

UART

mode

4.8

± 4.95

38.4

-108

-111

-108

19.2

± 9.9

51.2

-107

19.2

± 19.8

102.4

-103

-106

-103

38.4

± 19.8

102.4

-103

76.8

± 36.0

153.6

-99

-100

-99

153.6

± 72.0

307.2

-94

Table 20. Typical receiver sensitivity as a function of data rate at 868 MHz, FSK

modulation, BER = 10 3, pseudo-random data (PN9 sequence).

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