SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015
5.9.4
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
and
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
which includes an external T/R switch.
Refer to
AN029 CC1020/1021 Automatic Frequency Control (AFC)
) for plots of sensitivity
versus frequency offset.
Table 5-6. Typical Receiver Sensitivity as a Function of Data Rate at 433 MHz, FSK Modulation,
BER = 10
–3
, Pseudo-random Data (PN9 Sequence)
SENSITIVITY [dBm]
CHANNEL
DATA RATE
DEVIATION
SPACING
FILTER BW
MANCHESTER
[kBaud]
[kHz]
NRZ MODE
UART MODE
[kHz]
MODE
2.4 optimized
12.5
±2.025
9.6
–115
–118
–115
sensitivity
(1)
2.4 optimized
12.5
±2.025
12.288
–112
–114
–112
selectivity
(1)
4.8
25
±2.475
19.2
–112
–112
–112
9.6
50
±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
–104
–104
76.8
200
±36.0
153.6
–101
–101
–101
153.6
500
±72.0
307.2
–96
–97
–96
(1)
Optimized selectivity
is relevant for systems targeting compliance with ARIB STD-T67, 12.5 kHz channel spacing.
Table 5-7. Typical Receiver Sensitivity as a Function of Data Rate at 868 MHz, FSK Modulation,
BER = 10
–3
, Pseudo-random Data (PN9 Sequence)
SENSITIVITY [dBm]
CHANNEL
DATA RATE
SPACING
DEVIATION [kHz]
FILTER BW
MANCHESTER
[kBaud]
NRZ MODE
UART MODE
[kHz]
MODE
2.4
12.5
±2.025
12.288
–112
–116
–112
4.8
25
±2.475
19.2
–111
–112
–111
9.6
50
±4.95
25.6
–109
–110
–109
19.2
100
±9.9
51.2
–107
–107
–107
38.4
150
±19.8
102.4
–103
–103
–103
76.8
200
±36.0
153.6
–99
–100
–99
153.6
500
±72.0
307.2
–94
–94
–94
30
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