SI2107 SILABS [Silicon Laboratories], SI2107 Datasheet - Page 54

• Manufacturer Part Number: SI2107
• Description: SATELLITE RECEIVER FOR DVB-S/DSS
• Manufacturer: SILABS [Silicon Laboratories]

Si2107/08/09/10
Register 29h. Carrier Estimation Control
Register 36h. Carrier Estimator Offset L
54
Name
Bit
7:4
2:0
Name
3
Bit
Bit
7:0
Bit
D7
D7
0
CESR[2:0]
Reserved
Reserved
Name
CFO[7:0]
Name
D6
D6
0
Carrier Frequency Offset (Low Byte).
Designed to store a residual carrier frequency offset for future acquisi-
tions. Used during carrier offset estimation to adjust the center fre-
quency.
Note: CFO is a 16-bit Twos complement number.
Default: 00h
D5
D5
0
Program to zero.
Program to one.
Carrier Estimation Search Range.
000 = Reserved
001 = ± f
010 = ± f
011 = ± f
100 = ± f
101 = ± f
110 = ± f
111 = ± f
Preliminary Rev. 0.7
s
s
s
s
s
s
s
/ 2048
/ 128
/ 1024
/ 32
/ 64
/ 256
/ 512
Search center frequency
D4
D4
0
CFO[7:0]
(± 0.2 MHz typ.)
(± 6.3 MHz typ.) (default)
(± 3.1 MHz typ.)
(± 1.6 MHz typ.)
(± 0.8 MHz typ.)
(± 0.4 MHz typ.)
(± 0.1 MHz typ.)
D3
D3
1
Function
Function
=
f
desired
D2
D2
+
CFO
CESR[2:0]
×
------- -
2
D1
D1
f
15
s
Hz
D0
D0