CC1110Fx / CC1111Fx
0xDF0C: MDMCFG4 – Modem configuration
Bit Field Name
Reset
R/W
Description
7:6 CHANBW_E[1:0]
5:4 CHANBW_M[1:0]
10
00
R/W
R/W
Sets the decimation ratio for the delta-sigma ADC input stream and thus the
channel bandwidth.
fref
BWchannel
=
8⋅(4 + CHANBW _ M )·2CHANBW _ E
The default values give 203 kHz channel filter bandwidth when fRef = 26 MHz
and 188 kHz when fRef = 24 MHz.
3:0 DRATE_E[3:0]
1100
R/W
The exponent of the user specified symbol rate.
0xDF0D: MDMCFG3 – Modem Configuration
Bit Field Name
Reset
R/W
Description
7:0 DRATE_M[7:0]
0x22
R/W
The mantissa of the user specified symbol rate. The symbol rate is configured
using an unsigned, floating-point number with 9-bit mantissa and 4-bit
exponent. The 9th bit is a hidden ‘1’. The resulting data rate is:
256 + DRATE _ M
⋅ 2DRATE _ E
RDATA
=
⋅ fref
228
The default values give a data rate of 115.051 kBaud when fRef = 26 MHz and
106.201 kHz when fRef = 24 MHz.
SWRS033E
Page 212 of 239
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