SX1231-31SKB915 Semtech, SX1231-31SKB915 Datasheet - Page 25

• Manufacturer Part Number: SX1231-31SKB915
• Description: TVS
• Manufacturer: Semtech

Specifications of SX1231-31SKB915

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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