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參數(shù)資料
| 型號(hào)： | TEA2028-TEA2029 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁(yè)數(shù)： | 9/47頁(yè) |
| 文件大?。?/td> | 532K |
| 代理商： | TEA2028-TEA2029 |
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V.2.3 - Sync pulse detection
This function is fulfilled by comparing the inverted
video signal (V
S1
+ V
D
) whose black level is con-
stant at 2V, with the sync 50% voltage level on
Pin 26 (see Figure 10).
ComparatorC4 will deliverthe line sync pulse(LS)
which will be used for 3 functions :
- Horizontalscanningfrequency locking: output to
1 phasecomparator.
- Framesync extraction for vertical scanning syn-
chronization.
- Detectingthepresence ofa videosignal at circuit
input.
The LS signal in two latter functions is filtered for
noise by using combination of current generator I
and a zenerdiode equivalentto acapacitor.
Using this extraction technique at a very noisy
video signal yields remarkabledisplay stability.
Figure10
The device also provides for scanning synchroni-
zationat aerialsignal attenuation of approximately
75dB, i.e. 15 to 20dB better than other sync proc-
essors.
V.3 - FirstPhase Locked-loop Stage ”
1”
This stage is commonly called the first Phase
Locked-Loop”
1”.
Its duty is to lock the frequency and the phase of
the horizontal time base with respect to the line
sync signal.
In the absence of transmission (i.e. lack of line
sync), the horizontal scanning frequency is ob-
tained by dividing the output frequency of a VCO
device. This VCO oscillates at approximately
500kHz and uses a low frequency drift ceramic
resonator.Thismethodeliminatesthe needof hori-
zontal frequencyadjustment.
26
V
50%
C4
V
50%
V
V
+
S1
D
V+
CC
+
3V
Frame
Separator
i
I
I
+
LS
C
LS
On Video
Recognition Output
V+
CC
250ns
LS
Video at Pin 27
Line Sync. Output
toward Phase Comparator
1
2
V.3.1 - Phase locked-loop”
1”block diagram
Figure11
A
(mA/rd)
LOW-PASS
FILTER
F(P)
BY-32-DIVIDER
STAGES
VCO
B (kHz/V)
1
P
+
-
i
PhaseComparator
ω
S
Horizontal
Frequency
CeramicResonator
φ
IN
φ
OUT
LS
1
V
e
ω
1
2
TEA2028 - TEA2029 APPLICATIONNOTE
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| TEA2028 | APPLICATION NOTE |
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| TEA2164S | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2029C | COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA2029 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:APPLICATION NOTE |
| TEA2029C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
| TEA2029CV | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Timing Processor (LINE, FRAME, SMPS) for TV Sets |
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| TEA2031A_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:COLOR TV EAST-WEST CORRECTION |
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