SX1231-31SKB915 Semtech, SX1231-31SKB915 Datasheet - Page 65

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

Specifications of SX1231-31SKB915

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

6.4. Receiver Registers
Table 24 Receiver Registers
Rev 3 - April 2010
ADVANCED COMMUNICATIONS & SENSING
Name
(Address)
Reserved14
(0x14)
Reserved15
(0x15)
Reserved16
(0x16)
Reserved17
(0x17)
RegLna
(0x18)
RegRxBw
(0x19)
RegAfcBw
(0x1A)
Bits Variable Name
7-0
7-0
7-0
7-0
5-3
2-0
7-5
4-3
2-0
7-5
4-3
2-0
7
6
-
-
-
-
LnaZin
-
LnaCurrentGain
LnaGainSelect
DccFreq
RxBwMant
RxBwExp
DccFreqAfc
RxBwMantAfc
RxBwExpAfc
Mode
rw
rw
rw
rw
rw
rw
rw
rw
r
r
r
r
r
r
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Default
Value
0xB0
0x7B
0x9B
011 *
0x40
001
000
010
101
100
10
01
1
0
*
*
*
*
Description
unused
unused
unused
unused
LNA’s input impedance
0
1
unused
Current LNA gain, set either manually, or by the AGC
LNA gain setting:
000
001
010
011
100
101
110
111
Cut-off frequency of the DC offset canceller (DCC):
~4% of the RxBw by default
Channel filter bandwidth control:
00
01
Channel filter bandwidth control:
FSK Mode:
OOK Mode:
See Table 13 for tabulated values
DccFreq parameter used during the AFC
RxBwMant parameter used during the AFC
RxBwExp parameter used during the AFC
50 ohms
200 ohms
RxBwMant = 16
RxBwMant = 20
reserved
G3 = highest gain – 12 dB
G6 = highest gain – 48 dB
gain set by the internal AGC loop
G1 = highest gain
G2 = highest gain – 6 dB
G4 = highest gain – 24 dB
G5 = highest gain – 36 dB
RxBw
RxBw
fc
=
=
----------------------------------------------------------------- -
RxBwMant 2
----------------------------------------------------------------- -
RxBwMant 2
=
----------------------------------------- -
2 π 2
×
4 RxBw
×
DccFreq
FXOSC
FXOSC
10
11
×
×
RxBwExp
RxBwExp
+
reserved
RxBwMant = 24
2
DATASHEET
www.semtech.com
SX1231
+
+
2
3