CC2500_06 Datasheet, PDF (60/84 Pages) Texas Instruments – Single Chip Low Cost Low Power RF Transceiver

CC2500
Bit Field Name
7:6 CHANBW_E[1:0]
5:4 CHANBW_M[1:0]
3:0 DRATE_E[3:0]
0x10: MDMCFG4 – Modem configuration
Reset
R/W Description
2 (10)
0 (00)
12 (1100)
R/W
R/W Sets the decimation ratio for the delta-sigma ADC input stream
and thus the channel bandwidth.
BW_channel
=
f _XOSC
8 ⋅ (4 + CHANBW _ M )·2^{CHANBW _ E}
The default values give 203 kHz channel filter bandwidth,
assuming a 26.0 MHz crystal.
R/W The exponent of the user specified symbol rate
Bit Field Name
7:0 DRATE_M[7:0]
0x11: MDMCFG3 – Modem configuration
Reset
R/W Description
34 (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 9^th bit is a hidden
‘1’. The resulting data rate is:
( ) _{RDATA =}
256 + DRATE _ M
2²⁸
⋅ 2^{DRATE _ E} _{⋅ f XOSC}
The default values give a data rate of 115.051 kbps (closest
setting to 115.2 kbps), assuming a 26.0 MHz crystal.
PRELIMINARY Data Sheet (Rev.1.2) SWRS040A
Page 60 of 83