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4.3 Receiver Configuration Registers (RXCFG)
0x10 - RXCFG10 [defaul t 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
7,6,5,4
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)/(F+1), where F CBW is the 3 dB cutoff frequency of the Butterworth filters in
kHz, J is the integer value of BW_filt with a range of 0 to 15, and F is the integer value of the bit pattern in
RXCFG13 , which has a default value of 7.
or
BW_filt
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)/(F+1), 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, J is the integer value of BW_filt with the usable range of 0 to 1, and F is the integer
value of the bit pattern in RXCFG13 , which has a default value of 7.
BW_filt default = 0011b, F CBW = 100 kHz for a 12,800 kHz crystal and RXCFG13 = 7
Table 29
0x11 - RXCFG11 [defaul t 0x38]
Name
Bits
R/W
Description
Center frequency of the polyphase filter:
F OPP = 200*(F XTAL /12800)*(L + 1)/(F+1), where F OPP is the center frequency of the OOK polyphase filter in
Polyfilt
7,6,5,4
r/w
kHz, F XTAL is the crystal frequency in kHz, L is the integer value of Polyfilt, and F is the integer value of the
bit pattern in RXCFG13 , which has a default value of 7
Polyfilt default = 0011b, F OPP = 100 kHz for a 12,800 kHz crystal and RXCFG13 = 7
Power Amp Step regulation mode:
PA_reg
3
r/w
0 → Regulation disabled
1 → Regulation enabled
-
2,1,0
Not used
Table 30
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TRC103 - 11/29/12
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