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參數(shù)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(shù)： | 8/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-16/44
Continued from preceding page.
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
NTSC
TdY1
Obtain the time difference (the delay time) from
when the rise of the input signal's 50IRE amplitude
to the output signal's 50IRE amplitude.
FILTER SYS: 0100
PAL
TdY2
Obtain the time difference (the delay time) from
when the rise of the input signal's 50IRE amplitude
to the output signal's 50IRE amplitude.
FILTER SYS: 0010
SECAM
TdY3
Obtain the time difference (the delay time) from
when the rise of the input signal's 50IRE amplitude
to the output signal's 50IRE amplitude.
FILTER SYS: 1000
6MHz
TRAP
TdY4
Obtain the time difference (the delay time) from
when the rise of the input signal's 50IRE amplitude
to the output signal's 50IRE amplitude.
FILTER SYS: 0100
Y-DL
TIME
APF
TdY5
21
L-50
Obtain the time difference (the delay time) from
when the rise of the input signal's 50IRE amplitude
to the output signal's 50IRE amplitude.
FILTER SYS: 0000
Y APF: 1
Measure the 0IRE DC level at point A of the output
signal in the Black Stretch Defeat (Black Stretch
OFF) mode. BKST1 [V]
Measure the 0IRE DC level at point A of the output
signal in the Black Stretch ON mode. (PIN45: 3V)
BKST2 [V]
Black
stretch
gain
MAX
BKSTmax
BKSTmax = 50
× (BKST1-BKST2)/ CNTHB
Blk.str.gain = 10
Blk.str.start = 01
MID
BKSTmid
With Blk.str.gain = 01, carry out the same
measurement as for the case of black stretch gain
(MAX). (PIN45: 3V)
Blk.str.gain = 01
Blk.str.start = 01
MIN
BKSTmin
21
L-BK
With Blk.str.gain = 00, carry out the same
measurement as for the case of black stretch gain
(max). (PIN45: 3V)
Blk.str.gain = 00
Blk.str.start = 01
Measure the DC level at 60IRE of the output signal
in the Black Stretch ON mode.
(PIN45: 3V) BKST3 [V]
Measure the 60IRE DC level of the output signal in
the Black Stretch Defeat (Black Stretch OFF)
mode. BKST4 [V]
Black stretch start max
(60IRE
Black)
BKSTTHmax
21
L-60
Calculate BKSTTHmax = 50
× (BKST4-BKST3)/
CNTHB.
Blk.str.gain = 01
Blk.str.start = 10
Measure the 50IRE DC level of the output signal in
the Black Stretch Defeat ON mode. (PIN45: 3V)
BKST5 [V]
Measure the 50IRE DC level of the output signal in
the Black Stretch Defeat (Black Stretch OFF)
mode. BKST6 [V]
Black stretch start mid
(50IRE
Black)
BKSTTHmid
21
L-50
Calculate BKSTTHmid = 50
× (BKST6-BKST5)/
CNTHB.
Blk.str.gain = 01
Blk.str.start = 01
Measure the 40IRE DC level of the output signal in
the Black Stretch Defeat ON mode. (PIN45: 3V)
BKST7 [V]
Measure the 40IRE DC level of the output signal in
the Black Stretch Defeat (Black Stretch OFF)
mode. BKST8 [V]
Black stretch start min
(40IRE
Black)
BKSTTHmin
21
L-40
Calculate BKSTTHmin = 50
× (BKST8-BKST7)/
CNTHB.
Blk.str.gain = 01
Blk.str.start = 00
Continued on next page.
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