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4.3 Receiver Configuration Registers (RXCFG)
0x10 - RXCFG10 [default 0xA3]
Name
Bits
R/W
Description
Bandwidth of the low-pass filter.
0000 → 65 kHz
0001 → 82 kHz
0010 → 109 kHz
0011 → 137 kHz
0100 → 157 kHz
0101 → 184 kHz
0110 → 211 kHz
LP_filt(7..4)
7,6,5,4
r/w
0111 → 234 kHz
1000 → 262 kHz
1001 → 321 kHz
1010 → 378 kHz
1011 → 414 kHz
1100 → 458 kHz
1101 → 514 kHz
1110 → 676 kHz
1111 → 987 kHz
Cutoff frequency of the receiver FSK Butterworth low-pass filters:
F CBW = 200*(F XTAL /12800)*((J + 1)/8), where F CBW is the 3 dB cutoff frequency of the Butterworth filters in
kHz, and J is the integer value of BW_filt with a range of 0 to 15.
or
BW_filt(3..0)
3,2,1,0
r/w
Upper cutoff frequency of the OOK polyphase band-pass filters:
F CPP = F OPP + 200*(F XTAL /12800)*((J + 1)/8), where F CPP is the upper cutoff frequency of polyphase filters in
kHz , F OPP is the center frequency of the OOK polyphase filters in kHz (see RXCFG11 below), F XTAL is the
crystal frequency in kHz, and J is the integer value of BW_filt with the usable range of 0 to 1.
BW_filt default = 0011b, F CBW = 100 kHz for a 12,800 kHz crystal
Table 31
0x11 - RXCFG11 [default 0x38]
Name
Bits
R/W
Description
Center frequency of the polyphase filter:
Polyfilt(7..4)
7,6,5,4
r/w
F OPP = 200*(F XTAL /12800)*((L + 1)/8), where F OPP is the center frequency of the OOK polyphase filter in
kHz, F XTAL is the crystal frequency in kHz, and L is the integer value of Polyfilt.
Polyfilt default = 0011b, F OPP = 100 kHz for a 12,800 kHz crystal
Power Amp Step regulation mode:
PA_reg
3
r/w
0 → Regulation disabled
1 → Regulation enabled
-
2,1,0
Not used
Table 32
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Page 35 of 67
TRC105 - 05/29/13
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