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參數(shù)資料
| 型號： | GS4881-ITA |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Monolithic Video Sync Separators |
| 中文描述： | 單片視頻同步分離器 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 279K |
| 代理商： | GS4881-ITA |
13
520 - 23 - 03
VIDEO
0.1μF
CH1
CH2
2
75
560
4
8
680k
0.1μ
6
Photograph 3 shows the amount of sync clipping for a 560
source resistor. A graph of V
CLIP
versus R
S
is shown in
Figure 23, and Figure 24 shows the corresponding capacitor
value for a particular series resistor to provide a corner
frequency of 500 kHz.
In applications where signal levels are small the amount of
attenuation should be minimized. It follows from Figure 23 and
Figure 24 that in order to minimize attenuation a small series
resistor and a larger capacitor to ground should be chosen.
This however, increases the capacitive loading of the signal
source.
Another way to minimize the amount of attenuation is to control
the source resistance seen by the sync separator by using a
PNP emitter follower (Figure 25). A PNP emitter follower works
well to drive the sync separator, and does not require much
DC current because the transistor provides the current when
it is needed during sync. Figure 26 is a typical application
circuit that minimizes sync tip clipping.
Test Circuit 3
Fig. 25 PNP Emitter Follower Buffer
Photograph 3
100
90
80
70
60
50
40
30
20
10
0
0 100 200 300 400 500 600 700
SERIES RESISTOR (
)
V
C
SERIES RESISTOR (
)
0 100 200 300 400 500 600 700
10
9
8
7
6
5
4
3
2
1
0
C
Fig. 23 V
CLIP
vs Series Resistor
Fig. 24 C vs Series Resistor
5.6k
C
C
2
V
CC
75
VIDEO
INPUT
FILTER
4
8
-5V
680k
0.1μ
6
V
CC
6
-5V
C
C
2
75
VIDEO
INPUT
4
8
5.6k
56p
5.6k
680k
0.1μ
Fig. 26 Typical NTSC Application Circuit
CH1
CH2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GS4981 | Monolithic Video Sync Separators |
| GS4981-CDA | Monolithic Video Sync Separators |
| GS4981-CKA | Monolithic Video Sync Separators |
| GS4981-CTA | Monolithic Video Sync Separators |
| GS4981-IDA | Monolithic Video Sync Separators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GS4882 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Sync Separators with 50% Sync Slicing |
| GS4882-CDA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Gennum Corporation 功能描述: |
| GS4882CKA | 制造商:Gennum Corporation 功能描述: |
| GS4882-CKA | 制造商:Gennum Corporation 功能描述: |
| GS4882-CKAE3 | 制造商:Semtech Corporation 功能描述:Video Sync Separator 8-Pin SOIC 制造商:Gennum Corporation 功能描述: 制造商:Semtech Corporation 功能描述:Sync Separators |
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