SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015
In this mode, AGC_AVG in the VGA2 register must be set to 3. The channel bandwidth must be 4 times
the Baud rate for data rates up to 9.6 kBaud. For the highest data rates the channel bandwidth must be 2
times the Baud rate (see
). Manchester coding must always be used for OOK.
NOTE
The automatic frequency control (AFC) cannot be used when receiving OOK, as it requires a
frequency shift.
The AGC has a certain time-constant determined by FILTER_CLK, which depends on the IF filter
bandwidth. There is a lower limit on FILTER_CLK and hence the AGC time constant. For very low data
rates the minimum time constant is too fast and the AGC will increase the gain when a “0” is received and
decrease the gain when a “1” is received. For this reason the minimum data rate in OOK is 2.4 kBaud.
Typical figures for the receiver sensitivity (BER = 10
–3
) are shown in
for OOK.
9.6 kBaud
Figure 5-29. OOK Eye Diagram
Table 5-14. Typical Receiver Sensitivity as a Function of Data Rate at 433 and 868 MHz, OOK Modulation,
BER = 10
–3
, Pseudo-random Data (PN9 Sequence)
SENSITIVITY [dBm]
DATA RATE
FILTER BW
433 MHz
868 MHz
[kBaud]
[kHz]
MANCHESTER MODE
MANCHESTER MODE
2.4
9.6
–116
—
4.8
19.2
–113
–107
9.6
38.4
–103
–104
19.2
51.2
–102
–101
38.4
102.4
–95
–97
76.8
153.6
–92
–94
153.6
307.2
–81
–87
54
Detailed Description
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