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VCT3801A 参数 Datasheet PDF下载

VCT3801A图片预览
型号: VCT3801A
PDF下载: 下载PDF文件 查看货源
内容描述: 视频/控制/图文电视IC系列 [Video/Controller/Teletext IC Family]
分类和应用: 电视
文件页数/大小: 172 页 / 2219 K
品牌: MICRONAS [ MICRONAS ]
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ADVANCE INFORMATION  
VCT 38xxA  
2.10.12.Priority Decoder  
2.10.13.Scan Velocity Modulation  
The priority decoder selects the picture source  
depending on the programmed priorities. Up to eight  
levels can be selected for OSD and the picture frame –  
where 0 is the highest. The video source always has  
the lowest priority. A 5-bit information is attached to  
each priority (see Table 2–4 on page 34). These bits  
are programmable via the I2C bus and have the follow-  
ing meanings:  
The RGB input signal of the SVM is converted to Y in a  
simple matrix. Then the Y signal is differentiated by a  
filter of the transfer function 1-Z-N, where N is program-  
mable from 1 to 6. With a coring, some noise can be  
suppressed. This is followed by a gain adjustment and  
an adjustable limiter. The analog output signal is gen-  
erated by an 8-bit D/A converter.  
The signal delay can be adjusted by ±3.5 clocks in  
half-clock steps. For the gain and filter adjustment  
there are two parameter sets. The switching between  
these two sets is done with the same RGB switch sig-  
nal that is used for switching between video-RGB and  
OSD-RGB for the RGB outputs (see Fig. 2–17).  
– one of two contrast, brightness and matrix values for  
main and side picture  
– RGB from video signal or color look-up table  
– disable/enable black-level expander  
– disable/enable peaking transient suppression when  
signal is switched  
– disable/enable analog Fast-Blank input  
RGB Switch  
R
G
B
Coring  
Gain1  
Gain2  
N1  
N2  
Limit  
Delay  
Matrix and  
Shaping  
Modulation  
Notch  
Differen-  
tiator  
Output  
Delay  
adjustment  
D/A  
Converter  
Coring  
adjustment  
Gain  
adjustment  
Limiter  
-Nx  
1-Z  
Fig. 2–17: SVM Block diagram  
2.10.14.Display Phase Shifter  
A phase shifter is used to partially compensate the  
phase differences between the video source and the  
flyback signal. By using the described clock system,  
this phase shifter works with an accuracy of approxi-  
mately 1 ns. It has a range of 1 clock period which is  
equivalent to ±24.7 ns at 20.25 MHz. The large  
amount of phase shift (full clock periods) is realized in  
the front-end circuit.  
Micronas  
23  
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