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參數(shù)資料
| 型號： | STV9428 |
| 廠商： | 意法半導體 |
| 英文描述： | High Speed Multisynch On-Screen Display for Monitor(用于監(jiān)視器的屏上顯示) |
| 中文描述： | 高速Multisynch屏幕的顯示器顯示（用于監(jiān)視器的屏上顯示） |
| 文件頁數(shù)： | 17/20頁 |
| 文件大小： | 559K |
| 代理商： | STV9428 |
FUNCTIONAL DESCRIPTION
(continued)
VI.2 - How to choose the value of the time
constant
The time response of the PLL is given by its char-
acteristic equation which is :
(
x
1
)
2
+
(α
+
β
)
(
x
1
)
+
β
=
0.
Where :
α
=
3
LD[6:1]
2
A
11
and
β
=
3
LD[6:1]
2
B
19
.
(LD[6:1] = value of the LINE DURATION register,
A = value of the 1st time constant, AF or AS and
B = value of the 2
d
time constant, BF or BS).
As you can see, the solution depend only on the
LINE DURATION and the TIME CONSTANTS
given by the I
2
C registers.
If
(α
+
β)
2
4
β
≥
0 and
2
α
β
<
4, the PLL is sta-
ble and its response is like this presented on Figure
13.
t
PLL
Frequency
f
0
f
1
t
Input
Frequency
f
0
f
1
9
Figure 13 :
Time Response of the PLL/Charac-
teristic Equation Solutions
(with real solutions)
If
(α
+
β)
2
4
β
≤
0, the response of the PLL is like
this presented on Figure 14.
In this case the PLL is stable if
τ
> 0.7 damping
coefficient).
t
PLL
Frequency
f
0
f
1
t
Input
Frequency
f
0
f
1
9
Figure 14 :
Time Response of the PLL/Charac-
teristic Equation Solutions (with
Complex Solutions)
The Table 6 gives some good values for A and B
constants for different values of the LINE DURA-
TION.
Summary
For a good working of the PLL :
- A and B time constants must be chosen among
values for which the PLL is stable,
- B must be equal or greater than A and the differ-
ence between them must be less than 3,
- The greater (A, B) are, the faster the capture is.
An optimal choice for the most of applications might
be :
- For locking condition : AS = 0 and BS = 1,
- For capture process : AF = 2 and BF = 4.
But for each application the time constants can be
calculated by solving the characteristic equation
and choosing the best response.
Table 6 :
Valid Time Constants Examples
B \ A
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
YYYY
YYYY
NYYY
NNNY
NNNN
NNNN
NNNN
NNNN
YYYY
YYYY
YYYY
YYYY
NYYY
(1)
NNNY
NNNN
NNNN
YYYY
YYYY
YYYY
YYYY
YYYY
YYYY
NYYY
NNNY
YYYN
YYYN
YYYN
YYYN
YYYN
YYYN
YYYN
YYYN
YNNN
YNNN
YNNN
YNNN
YNNN
YNNN
YNNN
YNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
NNNN
9
Note 1 :
Case of A[2:0] = 1 (001) and B[2:0] = 4 (100) :
LD
Valid Time Constants
16
N
32
Y
48
Y
64
Y
Value of LINE DURATION Register (@ 3FF0) :
LD = 16 :LD[6:0] = 0010000, LD[6:1] = 001000
LD = 32 :LD[6:0] = 0100000
LD = 48 :LD[6:0] = 0110000
LD = 64 :LD[6:0] = 1000000, LD[6:1] = 100000.
Table meaning : N = No possible capture - No stability
Y = PLL can lock
STV9427 - STV9428 - STV9429
17/20
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