Texas Instruments CC2500 User Manual

CC2500
S
WRS040
C
Page
66
of
89
0x10: MDMCFG4
–
Modem C
onfiguration
Bit
Field Name
Reset
R/W
Description
7:6
CHANBW_E[1:0]
2 (10)
R/W
5:4
CHANBW_M[1:0]
0 (00)
R/W
Sets the decimation ratio for the delta
-
sigma ADC input s
tream
and thus the channel bandwidth.
E
CHANBW
XOSC
channel
M
CHANBW
f
BW
_
2
)·
_
4
(
8



The default values give 203 kHz channel filter bandwidth,
assuming a 26.0 MHz crystal.
3:0
DRATE_E[3:0]
12 (1100)
R/W
The exponent of the user specified symbol rate
0x11: MDMCFG3
–
Modem
C
on
figuration
Bit
Field Name
Reset
R/W
Description
7:0
DRATE_M[7:0]
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:


XOSC
E
DRATE
DATA
f
M
DRATE
R




28
_
2
2
_
256
The default values give a data rate of 115.051
kBaud
(closest
setting to 115.2
kBaud
), assuming a 26.0 MHz crystal.

Texas Instruments CC2500 Specifications

General

Brand	Texas Instruments
Model	CC2500
Category	Transceiver
Language	English