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參數資料
| 型號： | LA76818A |
| 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： | 17/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-24/44
Chroma Block [PAL/NTSC Common] Test Conditions
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
YIN:L77
No signal
Measure the Y system’s output level.
V1
B-Y/Y amplitude
ratio
CLRBY
Bout
21
C-2
Input a signal to the CIN (only sync signal to the
YIN) and measure the output level.
CLRBY = 100
× (V2/V1)+15%
Color: 1000000
1
CLRMN
Measure the output amplitude V1 at color control
MAX mode and output amplitude V2 at color
control CEN mode.
CLRMN = V1/V2
Color: 1111111
Color: 1000000
Color
control
characteris
tics
2
CLRMM
21
C-1
Measure the output amplitude V3 at color control
MIN mode. V3
CLRMM = 20Log (V1/V3)
Color: 0000000
Color control
sensitivity
CLRSE
21
C-1
Measure the output amplitude V4 at color control
90 mode and output amplitude V5 at color control
38 mode.
CLRSE = 100
× (V4-V5)/(V2× 52)
Color: 1011010
Color: 0100110
B
E_CAR_B
21
Measure the 8.86MHz component output
amplitude at pin 21.
R
E_CAR_R
Rout
19
Measure the 8.86MHz component output
amplitude at pin 19.
Residual
higher
harmonic
level
G
E_CAR_G
Gout
20
C-1
Burst only
Measure the 8.86MHz component output
amplitude at pin 20.
Chroma Block [PAL] Test Conditions
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
1
ACCM1_P
C-1
0dB
+6dB
Measure the output amplitude when 0dB is applied
to the chroma input and the output amplitude when
+6dB is applied to the chroma input and calculate
the ratio between them.
ACCM1_P = 20Log (+6dBdata/0dBdata)
Color: 1000000
ACC
amplitude
characteristi
cs
2
ACCM2_P
Bout
21
C-1
-20dB
Measure the output amplitude when –20dB is
applied to the chroma input and calculate the ratio
between them.
ACCM2_P = 20Log (-20dBdata/0dBdata)
Color: 1000000
Demodulation
output ratio
R-Y/B-Y: PAL
RB_P
21
19
C-1
Refer to 5. and measure Bout output amplitude Vb
and ROUT output amplitude Vr.
RB_P = Vr/Vb.
Color: 1000000
Demodulation
output ratio
G-Y/B-Y: PAL
GB_P
21
20
C-4
Measure Bout output amplitude Vbp and GOUT
output amplitude Vgbp.
GB_P = Vgbp/Vbp.
Color: 1000000
Demodulation
output ratio
G-Y/R-Y: PAL
GR_P
20
19
C-5
Measure Rout output amplitude Vrp and GOUT
output amplitude Vgbp.
GR_P = Vgrp/Vbp.
Color: 1000000
Continued on next page.
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