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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： | 18/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-25/44
Continued from preceding page.
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Demodulation
angle
R-Y/B-Y:
PAL
ANGBR_P
21
19
C-1
Refer to 5. and measure the B-Y and R-Y
demodulation angle and calculate.
Color: 1000000
Killer operating
point 0 (PAL)
KILLP0
21
C-1
Reduce the input signal until the output Level
becomes 150mVp-p or less. Measure the input
level at that moment.
Color Killer Ope.: 0
Killer operating
point 3 (PAL)
KILLP3
21
C-1
Reduce the input signal until the output Level
becomes 150mVp-p or less. Measure the input
level at that moment.
Color Killer Ope.: 3
Difference between
two Killer operating
points (PAL)
DKILLP
DKILLP = KILLPO-KILLP3
APC pull-in range (+)
PULIN+_P
21
C-1
Decrease the chroma fsc frequency from
4.433619MHz+1000Hz and measure the
frequency at which the VCO locks.
APC pull-in range (-)
PULIN-_P
21
C-1
Increase the chroma fsc frequency from
4.433619MHz-1000Hz and measure the
frequency at which the VCO locks.
Chroma Block [NTSC] Test Conditions
1
ACCM1_N
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_N = 20Log (+6dBdata/0dBdata)
ACC
amplitude
characteri
stics
2
ACCM2_N
Bout
21
C-1
-20dB
Measure the output amplitude when 20dB is
applied to the chroma input and calculate the ratio
between them.
ACCM2_N = 20Log (-20dBdata/0dBdata)
Demodulation
output ratio
R-Y/B-Y: NTSC
RB_N
21
19
C-1
Refer to 5. and measure Bout output amplitude Vb
and ROUT output amplitude Vr. And calculate
RB_N = Vr/Vb.
Color: 1000000
Demodulation
output ratio
G-Y/B-Y: NTSC
GB_N
20
C-1
Refer to 5. and measure GOUT output amplitude
Vg. And calculate GB_N = Vg/Vb.
Color: 1000000
Demodulation
angle
B-Y/R-Y:
NTSC
ANGBR_N
21
19
C-1
Refer to 5. and measure the B-Y and R-Y
demodulation angle and calculate.
Reference: B-Y angle
Color: 1000000
Demodulation
angle
G-Y/B-Y:
NTSC
ANGGB_N
21
20
C-1
Refer to 5. and measure the B-Y and G-Y
demodulation angle and calculate.
Reference: B-Y angle
Color: 1000000
Killer operating
point 0 (NTSC)
KILLN0
21
C-1
Reduce the input signal until the output level
becomes 150mVp-p or less. Measure the input
level at that moment.
Color Killer Ope.: 0
Killer operating
point 3 (NTSC)
KILLN3
21
C-1
Reduce the input signal until the output level
becomes 150mVp-p or less. Measure the input
level at that moment.
Color Killer Ope.: 3
Continued on next page.
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