參數(shù)資料
型號(hào): L64780
廠商: LSI Corporation
英文描述: DVB-T COFDM Demodulator(對(duì)地?cái)?shù)字視頻廣播 正交編碼頻率分割多路處理解調(diào)器)
中文描述: 的DVB - T COFDM解調(diào)器(對(duì)地?cái)?shù)字視頻廣播正交編碼頻率分割多路處理解調(diào)器)
文件頁(yè)數(shù): 27/126頁(yè)
文件大?。?/td> 953K
代理商: L64780
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Time Synchronization
2-9
This leads to K
I
and K
P
values equal to:
Equation 2.9
2.6.2 TIM_CLK_INIT Register Definition
The TIM_CLK_INIT register is defined as a two’s complement 15-bit
register that has the following meaning:
Equation 2.10
where W
0
is the central frequency of the VCXO.
2.6.3 TIM External Loop Filter
The control voltage signal of the VCXO drives the Sigma Delta
modulated output, VCXOUT. Use the VCXOUT to drive an external
passive RC filter that feeds the timing clock control stage. See
Figure 2.4
.
Figure 2.4
External Low-Pass Loop Filter
The
3 dB cutoff frequency of this system is f
0
= 212 Hz, giving an
estimate of the TIM Loop Bandwidth and resulting in a low-pass filter
time constant T1 = RC = 750
μ
s.
The R and C values for the low-pass filter must meet the following
requirement: R
TIM
C
TIM
= 750
μ
s.
K
I
0.1
K
VCXO
------------------
=
K
P
512
K
I
×
=
W
i
W
0
5K
-------------------------------------------------------------------
TIM_CLK_INIT
2
15
+
=
R
TIM
= 10 k
C
TIM
= 75 nF
R= 1 k
VCXOUT
5V
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