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參數(shù)資料
| 型號(hào)： | UPC1830 |
| 廠商： | NEC Corp. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | RSO-S_D(Z) Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 15V; Power: 1W; 2:1 and 4:1 Wide Input Voltage Ranges; 1kVDC, 2kVD & 3kVDC Isolation; UL94V-0 Package Material; Continuous Short Circuit Protectionwith Current Foldback; Low Noise; No External Capacitor needed; Efficiency to 83% |
| 中文描述： | 過濾含視頻色度，同步信號(hào)處理LSI兼容NTSC制式/ PAL制 |
| 文件頁數(shù)： | 14/44頁 |
| 文件大小： | 338K |
| 代理商： | UPC1830 |
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μ
PC1830
14
Figure 5-1. Contrast Control Characteristic
(a) NTSC mode
(b) PAL mode
5.2 Chroma Signal Processing Section
(1) Input signal
Composite video signal input
After coupling by a capacitor (0.22
μ
F), a 1 V
p-p
composite video signal is input to the composite video signal
input pin (pin 36).
Separate chroma signal input
After coupling by a capacitor (1000 pF), a chroma signal whose burst signal amplitude is 150 mV
p-p
is input
to the separate chroma input pin (pin 34).
(2) Chroma BPF circuit
Separates the chroma signal from a composite video signal.
(3) Separate/composite switching circuit
When the potential of the separate chroma input pin (pin 34) is 3.7 V or higher (in composite mode), switches the ACC
amp input from the chroma input pin to the chroma BPF circuit output. Processing of the brightness signal at this time
is switched so that it passes through the chroma trap circuit.
Operation when switching separate/composite signals is shown in Table 5-1.
(4) ACC (Auto Color Control) amplification circuit
Extracts the burst signal, detects its level and smoothes the voltage of the ACC filter pin (pin 32) by an external
capacitor.
This smoothed voltage controls color gain to keep the amplitude of the burst signal constant.
2
1
0
1
2
3
4
5
Y
p
)
Contrast control pin voltage (V)
V
CC
= 5 V
400 mV
p-p
stair step (composite) input
2
1
0
1
2
3
4
5
Y
p
)
Contrast control pin voltage (V)
V
CC
= 5 V
400 mV
p-p
stair step (composite) input
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