Texas Instruments CC2500 - Page 69

CC2500
S
WRS040
C
Page
69
of
89
0x15: DEVIATN
–
Modem
D
eviation
S
etting
Bit
Field Name
Reset
R/W
Description
7
Reserved
R0
6:4
DEVIATION_E[2:0]
4 (100)
R/W
Deviation exponent
3
Reserved
R0
2:0
DEVIATION_M[2:0]
7 (111)
R/W
When MSK modula
tion is enabled:
Sets fraction of symbol period used for phase change.
Refer to
the
SmartRF

Studio software
[5]
for correct DEVIATN setting
when using MSK.
When
2
-
FSK
/GFSK
modulation is enabled:
Deviation manti
ssa, interpreted as a 4
-
bit value with MSB implicit
1. The resulting deviation is given by:
E
DEVIATION
xosc
dev
M
DEVIATION
f
f
_
17
2
)
_
8
(
2




The default values give ±47.607 kHz deviation, assuming 26.0
MHz crystal frequency.