參數(shù)資料
型號: L64780
廠商: LSI Corporation
英文描述: DVB-T COFDM Demodulator(對地數(shù)字視頻廣播 正交編碼頻率分割多路處理解調器)
中文描述: 的DVB - T COFDM解調器(對地數(shù)字視頻廣播正交編碼頻率分割多路處理解調器)
文件頁數(shù): 30/126頁
文件大?。?/td> 953K
代理商: L64780
2-12
Architectural Overview
2.7.4 AFC_INIT_FREQ Register Definition
In AFC digital loop mode, the AFC_INIT_FREQ register is defined as a
two’s complement 24-bit register with the following usage:
Equation 2.13
where W
0
is the central frequency of the VCXO.
In AFC analog loop mode, the AFC_INIT_FREQ register is defined as a
two’s complement 24-bit register and in the L64780 has the following
usage:
Equation 2.14
where W
0
is the frequency of the VCXO.
2.7.5 AFC External Loop Filter
The control signal of the frequency loop drives the Sigma-Delta
modulated output AFCOUT. Use the AFCOUT signal to drive an external
passive RC filter that feeds the timing clock control stage, as shown in
Figure 2.5
.
Figure 2.5
AFC Loop Pass Filter
The
3 dB cutoff frequency of this circuit is f
0
= 482 Hz, giving a rough
estimate of the Frequency Loop Bandwidth and resulting in a low-pass
filter time constant:
Equation 2.15
W
i
W
0
143
-------------------------
10
3
×
2
23
AFC_INIT_FREQ
×
+
=
W
i
W
0
5K
2
20
------------------
AFC_INIT_FREQ
×
+
=
R
AFC
= 100 k
C
AFC
= 3.3 nF
R= 10 k
AFCOUT
5V
T
1
RC
300
μ
s
=
=
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