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SX1231
WIRELESS & SENSING PRODUCTS
6.4. Receiver Registers
Table 25 Receiver Registers
DATASHEET
Name
(Address)
Bits Variable Name
Mode
Default
Value
Description
Reserved14
7-0
-
r
0x40
unused
(0x14)
Reserved15
7-0
-
r
0xB0
unused
(0x15)
Reserved16
7-0
-
r
0x7B
unused
(0x16)
Reserved17
7-0
-
r
0x9B
unused
(0x17)
RegLna
(0x18)
7
6
5-3
2-0
LnaZin
-
LnaCurrentGain
LnaGainSelect
rw
r
r
rw
1
*
0
001
000
LNA’s input impedance
0 ? 50 ohms
1 ? 200 ohms
unused
Current LNA gain, set either manually, or by the AGC
LNA gain setting:
000 ? gain set by the internal AGC loop
001 ? G1 = highest gain
010 ? G2 = highest gain – 6 dB
011 ? G3 = highest gain – 12 dB
100 ? G4 = highest gain – 24 dB
101 ? G5 = highest gain – 36 dB
110 ? G6 = highest gain – 48 dB
111 ? reserved
fc = ----------------------------------------- 2 -
2 π × 2
RegRxBw
(0x19)
7-5
DccFreq
rw
010
*
Cut-off frequency of the DC offset canceller (DCC):
4 × RxBw
DccFreq +
~4% of the RxBw by default
4-3
RxBwMant
rw
10
Channel filter bandwidth control:
*
00 ? RxBwMant = 16 10 ? RxBwMant = 24
01 ? RxBwMant = 20 11 ? reserved
2-0
RxBwExp
rw
101
Channel filter bandwidth control:
RxBw = ----------------------------------------------------------------- 2 -
RxBwMant × 2
RxBw = ----------------------------------------------------------------- 3 -
RxBwMant × 2
*
FSK Mode:
FXOSC
RxBwExp +
OOK Mode:
FXOSC
RxBwExp +
See Table 13 for tabulated values
RegAfcBw
(0x1A)
7-5
4-3
2-0
DccFreqAfc
RxBwMantAfc
RxBwExpAfc
rw
rw
rw
100
01
011 *
DccFreq parameter used during the AFC
RxBwMant parameter used during the AFC
RxBwExp parameter used during the AFC
Rev. 7 - June 2013
Page 69
www.semtech.com
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