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參數(shù)資料
| 型號： | AN5693 |
| 廠商： | Panasonic Corporation |
| 英文描述： | Luminance,Chroma and Sync. Signals Processing ICwith Built-in I2Cbus Interfacefor PAL/NTSC Color-TV |
| 中文描述： | 亮度，色度和同步。信號處理ICwith內(nèi)置I2Cbus Interfacefor PAL / NTSC制式彩色電視 |
| 文件頁數(shù)： | 22/34頁 |
| 文件大?。?/td> | 325K |
| 代理商： | AN5693 |
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22
AN5693K
ICs for TV
I
Pin Equivalent Circuit(continued)
Pin No.
Equivalent Circuit
Function
Status
33
34
Pin33 : Vertical Sync. Separation Input Pin
Pin34 : Horizontal Sync. Separation
Input Pin
Pin33, 34 internal circuits are similar
Usually, vertical synchronous threshold
is deeper than horizontal synchronous'
threshold. Thus R
V
>
R
H
R
H
and C
H
determine cutoff frequency
at about 500 kHz
R
→
big, threshold becomes deeper
(Sync. compression is weaker).
R
→
small, threshold becomes shallower
(fluctuation becomes weaker due to
vertical sag)
Sync. top is clamped at 1.3 V
AC
2 V
PP
35
V
CC3
(typ.5V) :
For chroma and jungle circuit
DC
5 V
36
Chroma Signal Input Pin
Black Expansion Starting Point
Adjustment Pin :
Pin36 is chroma signal input pin and
external DC voltage is applied to adjust
the starting point of black expansion
AC
+
DC
Burst typ.
300 mV
PP
DC typ.
4.5 V
37
GND :
For video,chroma and jungle circuit
DC
0 V
38
FBP Input Pin :
The FBP input pin is for horizontal
blanking and AFC circuit
Threshold level for
HBLK : 0.7 V
AFC : 1.9 V
External DC 1.3 V must be applied to
become all blanking
Input voltage below 0 V is prohibited
AC
FBP
5 V
(V
CC3
)
16 k
16 k
1.3 V
33
R
560
To H sync.
sep.
To V sync.
sep.
20
μ
A
1
μ
F
0.1
μ
F
C
H
1200 pF
C
V
680 pF
16 k
20
μ
A
34
R
270
2 V
PP
5 V
(V
CC3
)
To
Chroma
amp.
50
μ
A
12.5 pF
1000 pF
15 k
2.5 V
9 V
To
black level
expansion
25
μ
A
9 V
(V
CC1
)
100
μ
A
36
10 k
10 k
Chroma
signal
5 V
(V
CC3
)
50
μ
A
100
μ
A
50
μ
A
50
μ
A
40
k
40 k
100
μ
A
60 k
38
To
AFC
To
HBLK
1.9 V
24 k
0.7 V
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