Data Sheet

LJ1269HC
Rev1.0 Page 65 Web: www.ljelect.com
6.4. Receiver Registers
Table 26 Receiver Registers
Name (Address)
Bits
Variable Name
Mode
Default
Value
Description
Reserved14 (0x14)
7-0
-
r
0x40
unused
Reserved15 (0x15)
7-0
-
r
0xB0
unused
Reserved16 (0x16)
7-0
-
r
0x7B
unused
Reserved17 (0x17)
7-0
-
r
0x9B
unused
RegLna (0x18)
7
LnaZin
rw
1
*
LNA‟s input impedance
0 → 50 ohms
1 → 200 ohms
6
-
r
0
unused
5-3
LnaCurrentGain
r
001
Current LNA gain, set either manually, or by the AGC
2-0
LnaGainSelect
rw
100
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
101 → G5 = highest gain – 36 dB
111 → reserved
RegRxBw (0x19)
7-5
DccFreq
rw
010
*
Cut-off frequency of the DC offset canceller (DCC):
fc =
4𝑅𝑥𝐵𝑤
2𝜋×2
𝐷𝑐𝑐𝐹𝑟𝑒𝑞 +2
~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:
FSK Mode:
RxBw =
𝐹𝑋𝑂𝑆𝐶
𝑅𝑥𝐵𝑤𝑀𝑎𝑛𝑡 ×2
𝑅𝑥𝐵𝑤𝐸𝑥𝑝 +2
OOK Mode:
RxBw =
𝐹𝑋𝑂𝑆𝐶
𝑅𝑥𝐵𝑤𝑀𝑎𝑛𝑡 ×2
𝑅𝑥𝐵𝑤𝐸𝑥𝑝 +3
See Table 14 for tabulated values
RegAfcBw (0x1A)
7-5
DccFreqAfc
rw
100
DccFreq parameter used during the AFC
4-3
RxBwMantAfc
rw
01
RxBwMant parameter used during the AFC
2-0
RxBwExpAfc
rw
011*
RxBwExp parameter used during the AFC
Sub GHz FSK/OOK Transceiver Module DATASHEET