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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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VCT 38xxA  
ADVANCE INFORMATION  
FP Display Control Register, Vertical Sawtooth  
DC offset of SAWTOOTH output  
h’110  
0
OFS  
This offset is independent of EHT compensation.  
h’11b  
h’11c  
h’11d  
h’11e  
accu0 init value  
accu1 init value  
accu2 init value  
accu3 init value  
1365 A0  
900 A1  
0
0
A2  
A3  
FP Display Control Register, East-West Parabola  
h’12b  
h’12c  
h’12d  
h’12e  
h’12f  
accu0 init value  
accu1 init value  
accu2 init value  
accu3 init value  
accu4 init value  
1121 A0  
219 A1  
479 A2  
1416 A3  
1052 A4  
2.15.1.2. Calculation of Vertical and East-West  
Deflection Coefficients  
Vertical Deflection 60 Hz  
a
b
–1365.3  
1083.5  
c
+682.7  
–1090.2  
429.9  
d
–682.7  
In Table 2–8 the formula for the calculation of the  
deflection initialization parameters from the polynomi-  
nal coefficients a,b,c,d,e is given for the vertical and  
East-West deflection. Let the polynomial be:  
a0  
a1  
a2  
a3  
128  
+1645.5  
–1305.8  
1023.5  
P = a + b(x – 0.5) + c(x – 0.5)2 + d(x – 0.5)3 + e(x – 0.5)4  
The initialization values for the accumulators a0..a3 for  
vertical deflection and a0..a4 for East-West deflection  
are 12-bit values. The coefficients that should be used  
to calculate the initialization values for different field  
frequencies are given below, the values must be  
scaled by 128, i.e. the value for a0 of the 50 Hz vertical  
deflection is:  
East-West Deflection 50 Hz  
a
b
–341.3  
111.9  
c
1365.3  
–899.6  
586.8  
d
–85.3  
84.8  
e
341.3  
a0  
a1  
a2  
a3  
a4  
128  
–454.5  
898.3  
a0 = (a · 128 – b · 1365.3 + c · 682.7 – d · 682.7) / 128  
–111.1  
72.1  
–1171.7  
756.5  
Table 2–8: Calculation of Initialization values for  
Vertical Sawtooth and East-West Parabola  
East-West Deflection 60 Hz  
Vertical Deflection 50 Hz  
a
b
–341.3  
134.6  
c
1365.3  
–1083.5  
849.3  
d
–85.3  
102.2  
–161.2  
125.6  
e
341.3  
a
b
–1365.3  
899.6  
c
+682.7  
–904.3  
296.4  
d
–682.7  
+1363.4  
–898.4  
585.9  
a0  
a1  
a2  
a3  
a4  
128  
a0  
a1  
a2  
a3  
128  
–548.4  
1305.5  
–2046.6  
1584.8  
46  
Micronas  
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