SX1231-31SKB915 Semtech, SX1231-31SKB915 Datasheet - Page 25
SX1231-31SKB915
Manufacturer Part Number
SX1231-31SKB915
Description
TVS
Manufacturer
Semtech
Specifications of SX1231-31SKB915
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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3.5.5. Channel Filter
The role of the channel filter is to filter out the noise and interferers outside of the channel. Channel filtering on the SX1231
is implemented with a 16-tap Finite Impulse Response (FIR) filter, providing an outstanding Adjacent Channel Rejection
performance, even for narrowband applications.
Note
The single-side channel filter bandwidth RxBw is controlled by the parameters RxBwMant and RxBwExp in RegRxBw:
The following channel filter bandwidths are accessible (oscillator is mandated at 32 MHz):
Table 13 Available RxBw Settings
Rev 3 - April 2010
ADVANCED COMMUNICATIONS & SENSING
When FSK modulation is enabled:
When OOK modulation is enabled:
to respect oversampling rules in the decimation chain of the receiver, the Bit Rate cannot be set at a higher value
than 2 times the single-side receiver bandwidth (BitRate < 2 x RxBw)
(binary/value)
RxBwMant
10b / 24
01b / 20
00b / 16
10b / 24
01b / 20
00b / 16
10b / 24
01b / 20
00b / 16
10b / 24
01b / 20
00b / 16
10b / 24
01b / 20
00b / 16
10b / 24
01b / 20
00b / 16
10b / 24
01b / 20
00b / 16
10b / 24
01b / 20
00b / 16
RxBwExp
(decimal)
RxBw
RxBw
7
7
7
6
6
6
5
5
5
4
4
4
3
3
3
2
2
2
1
1
1
0
0
0
=
=
----------------------------------------------------------------- -
RxBwMant
----------------------------------------------------------------- -
RxBwMant
ModulationType=00
Page 25
FXOSC
FXOSC
100.0
125.0
166.7
200.0
250.0
333.3
400.0
500.0
FSK
10.4
12.5
15.6
20.8
25.0
31.3
41.7
50.0
62.5
83.3
2.6
3.1
3.9
5.2
6.3
7.8
×
×
2
2
RxBwExp
RxBwExp
RxBw (kHz)
+
+
2
3
ModulationType=01
100.0
125.0
166.7
200.0
250.0
OOK
10.4
12.5
15.6
20.8
25.0
31.3
41.7
50.0
62.5
83.3
1.3
1.6
2.0
2.6
3.1
3.9
5.2
6.3
7.8
DATASHEET
www.semtech.com
SX1231
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