Texas Instruments CC2500 - Page 73

CC2500
S
WRS040
C
Page
73
of
89
0x19: FOCCFG
–
Frequency Offset Compensation
C
onfiguration
Bit
Field Name
Reset
R/W
Description
7:6
Reserved
R0
5
FOC_BS_CS_GATE
1
R/W
If set, the demodulator freezes the frequency offset
compensat
ion and clock recovery feedback loops until the
CARRIER_SENSE signal goes high.
4:3
FOC_PRE_K[1:0]
2 (10)
R/W
The frequency compensation loop gain to be used before a sync
word is detected.
Setting
Freq. compensation loop gain before sync word
0 (00)
K
1 (01)
2
K
2 (10)
3
K
3 (11)
4
K
2
FOC_POST_K
1
R/W
The frequency compensation loop gain to be used after a sync
word is detected.
Setting
Freq. compensation loop gain after sync word
0
Same as FOC_PRE_K
1
K
/2
1:0
FOC_LIMIT[1:0]
2 (10)
R/W
The satur
ation point for the frequency offset compensation
algorithm:
Setting
Saturation point (max compensated offset)
0 (00)
±0 (no frequency offset compensation)
1 (01)
±BW
CHAN
/8
2 (10)
±BW
CHAN
/4
3 (11)
±BW
CHAN
/2
Frequency offset compensation is not support
ed for OOK;
A
lways use FOC_LIMIT=0 with this
modulation format
.