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SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
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10b / 24
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4
4
3
3
3
2
2
2
1
1
1
0
0
0
25.0
31.3
41.7
50.0
62.5
83.3
100.0
125.0
166.7
200.0
250.0
333.3
400.0
500.0
12.5
15.6
20.8
25.0
31.3
41.7
50.0
62.5
83.3
100.0
125.0
166.7
200.0
250.0
3.5.7. DC Cancellation
DC cancellation is required in zero-IF architecture transceivers to remove any DC offset generated through self-reception.
It is built-in the SX1231 and its adjustable cutoff frequency fc is controlled in RegRxBw :
Table 14 Available DCC Cutoff Frequencies
DccFreq
in RegRxBw
000
001
010 (default)
011
100
101
110
111
fc in
% of RxBw
16
8
4
2
1
0.5
0.25
0.125
The default value of DccFreq cutoff frequency is typically 4% of the RxBw (channel filter BW). The cutoff frequency of the
DCC can however be increased to slightly improve the sensitivity, under wider modulation conditions. It is advised to adjust
the DCC setting while monitoring the receiver sensitivity.
3.5.8. Complex Filter - OOK
In OOK mode the SX1231 is modified to a low-IF architecture. The IF frequency is automatically set to half the single side
bandwidth of the channel filter (F IF = 0.5 x RxBw ). The Local Oscillator is automatically offset by the IF in the OOK receiver.
A complex filter is implemented on the chip to attenuate the resulting image frequency by typically 30 dB.
Note
this filter is automatically bypassed when receiving FSK signals (ModulationType = 00 in RegDataModul).
3.5.9. RSSI
The RSSI block evaluates the amount of energy available within the receiver channel bandwidth. Its resolution is 0.5 dB,
and it has a wide dynamic range to accommodate both small and large signal levels that may be present. Its acquisition
Rev. 7 - June 2013
Page 29
www.semtech.com
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