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參數資料
型號: LA76818A
廠商: SANYO SEMICONDUCTOR CO LTD
元件分類: 接收器
英文描述: AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP54
封裝: 0.600 INCH, DIP-54
文件頁數: 15/44頁
文件大小: 289K
代理商: LA76818A
LA76818A
No.8047-22/44
Chroma Block Input Signals and Test Conditions
Unless otherwise specified, the following conditions apply when each measurement is made.
1. VIF, SIF blocks: No signal
2. Deflection Block: Horizontal/vertical composite sync signals are input and the deflection block must be locked into the
sync signals (Refer to the Deflection Block Input Signals and the Test Conditions).
3. Bus control conditions: Set the following conditions unless otherwise specified.
Y Input is 42 Pin (EXT-V IN),
C Input is 44 Pin (S-C IN)
(Video SW=1, C.Ext=1)
Other DAC except the above-mentioned conditions is all initial conditions.
4. Y Input condition: No signal unless otherwise specified.
(Sync is necessary to obtain synchronization).
5. How to calculate the demodulation ratio and angle:
B-Y axis angle = tan-1(B(0)/B(270))+270°
R-Y axis angle = tan-1(R(180)/R( 90))+90°
G-Y axis angle = tan-1(G(270)/G(180))+180°
B-Y axis amplitude Vb = SQRT(B(0)*B(0)+B(270)*B(270))
R-Y axis amplitude Vr = SQRT(R(180)*R(180)+R(90)*R(90))
G-Y axis amplitude Vg = SQRT(G(180)*G(180)+G(270)*G(270))
90
°
180
°
270
°
0
°
B(0)
R(90)
G(270)
R(180)
G(180)
B(270)
R-Y axis
B-Y axis
G-Y axis
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