參數(shù)資料
型號(hào): LA76075
廠商: Sanyo Electric Co.,Ltd.
英文描述: NTSC Color Television Sets
中文描述: NTSC制式彩電
文件頁數(shù): 17/35頁
文件大?。?/td> 712K
代理商: LA76075
Chroma Block Input Signals and Measurement Conditions
Unless otherwise specified for the items, apply the following conditions.
1. VIF and SIF blocks: No signals
2. Deflection block: Supply a composite horizontal and vertical synchronization signal and make sure that the deflection
block is locked onto that signal. (For details, see the section “Input Signals and Measurement Conditions.”)
3. Bus control conditions: Adjust the digital-to-analog converter to produce the best color (RGB) equality in the Y
signal levels from pins 28 (RED OUT), 29 (GRN OUT), and 30 (BLU OUT). Set Gamma Def to “1” (defeat). Unless
otherwise specified, use the initial values for all other settings.
4. Adjust the impedance (Z) of the crystal resonator, series capacitor, and resistor to the following value.
Z = 0deg @ 3.579545MHz ± 10Hz -40 ± 1deg @ 3.579345MHz
5. Y input: Unless otherwise specified, use the 0 IRE signal. (A synchronization signal is also necessary.)
6. C input: Connect this to pin 40 (CIN).
7. Calculate the demodulation angles with the following formulas.
R-Y axis = tan–1 (B(0)/B(270)) + 270°
B-Y axis = tan–1 (R(180)/R(90)) + 90°
G-Y axis = tan–1 (G(270)/G(180)) + 180°
8. Calculate the AF angle with the following formula, where BR is the B-Y/R-Y demodulation output ratio and
θ
is
ANGBR, the B-Y/R-Y demodulation angle.
AFXXX = tan–1
R–Y/B–Y
x
BR–cos
——————————
sin
No. 5845-17/35
LA76075
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