CC1020-RTR1 datasheet(32/91 Pages) TI

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CC1020

SWRS046

Page 32 of 92

transitions (or preamble bits) before

correct data slicing will depend on the

SETTLING[1:0] bits.

The automatic data slicer average value

function can be disabled by setting

SETTLING[1:0] = 00. In this case a

symmetrical

signal

around

the

frequency is assumed.

The internally calculated average FSK

frequency value gives a measure for the

frequency offset of the receiver compared

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]

Channel spacing

[kHz]

Deviation

[kHz]

Filter BW

[kHz]

NRZ

mode

Manchester

mode

UART

mode

2.4 optimized sensitivity

12.5

± 2.025

9.6

-115

-118

-115

2.4 optimized selectivity

12.5

± 2.025

12.288

-112

-114

-112

4.8

± 2.475

19.2

-112

9.6

± 4.95

25.6

-110

-111

-110

19.2

100

± 9.9

51.2

-107

-108

-107

38.4

150

± 19.8

102.4

-104

76.8

200

± 36.0

153.6

-101

153.6

500

± 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)

Note: “Optimized selectivity” in Table 19 is relevant for systems targeting compliance with

ARIB STD T-67, 12.5 kHz channel spacing.

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