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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： | 7/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-15/44
Video Block Test Conditions
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Video overall gain
(Contrast max)
CONT127
21
L-50
Measure the output signal’s 50IRE amplitude.
CNTHB [Vp-p]
CONT127 = 20Log (CNTHB/0.357).
CONTRAST:
1111111
Normal/
max
CONT63
21
L-50
Measure the output signal’s 50IRE amplitude.
CNTCB [Vp-p]
CONT63 = 20Log (CNTCB/0.357).
CONTRAST:
0111111
Contrast
adjustment
characteri
stics
Min/max
CONT0
21
L-50
Measure the output signal’s 50IRE amplitude.
CNTLB [Vp-p]
CONT0 = 20Log (CNTLB/0.357).
CONTRAST:
0000000
NTSC
BW1
With the input signal’s continuous wave = 100kHz,
measure the output signal’s continuous wave
amplitude. PEAKDC [Vp-p]
With the input signal’s continuous wave = 1.8MHz,
measure the output signal’s continuous wave
amplitude. CW1.8 [Vp-p]
BW1 = 20Log (CW1.8/PEAKDC).
FILTER SYS: 0000
SHARPNESS:
000000
PAL
BW2
With the input signal’s continuous wave = 2.2MHz,
measure the output signal’s continuous wave
amplitude. CW2.2 [Vp-p]
BW2 = 20Log (CW2.2/PEAKDC).
FILTER SYS: 0010
SHARPNESS:
000000
6MHz
TRAP
BW3
With the input signal’s continuous
wave = 2.3MHz, measure the output signal’s
continuous wave amplitude. CW2.3 [Vp-p]
BW3 = 20Log (CW2.3/PEAKDC).
FILTER SYS: 0100
SHARPNESS:
000000
Video
frequency
Characteri
stics
APF
BW4
21
L-CW
With the input signal’s continuous wave = 3.4MHz,
measure the output signal’s continuous wave
amplitude. CW3.4 [Vp-p]
BW3 = 20Log (CW3.4/PEAKDC).
FILTER SYS: 0000
SHARPNESS:
000000
Y APF: 1
With the input signal’s continuous wave =
4.43MHz, measure the output signal’s continuous
wave amplitude. F0P [Vp-p]
PAL
CtraPP
CtraP = 20Log (F0P/PEAKDC).
FILTER SYS: 010
Sharpness: 000000
With the input signal’s continuous wave =
3.58MHz, measure the output signal’s continuous
wave amplitude. F0N [Vp-p]
Chroma
trap
amount
NTSC
CtraPN
21
L-CW
CtraN = 20Log (F0N/PEAKDC).
FILTER SYS: 000
Sharpness: 000000
L-0
Measure the output signal’s 0IRE DC level.
BRTPL [V]
Brightness:
0000000
CONTRAST:
1111111
1
ClampG1
L-100
Measure the output signal’s 0IRE DC level
(DRVPH V) and 100IRE amplitude (DRVH Vp-p).
ClampG = 100
×
(1+(DRVPH - BRTPL)/DRVH). (PIN45: 3V)
Brightness:
0000000
Contrast:
1111111
DCREST=00
BLK.ST.DEF=1
WPL=0
2
ClampG2
With DCREST = 01, carry out measurement
similarly to the case of the DC transmission
amount 1. (PIN45: 3V)
DC.rest. = 01
3
ClampG3
With DCREST = 10, carry out measurement
similarly to the case of the DC transmission
amount 1. (PIN45: 3V)
DC.rest. = 10
With DCREST = 11, carry out measurement
similarly to the case of the DC transmission
amount 1. (PIN45: 3V)
DC.rest. = 11
DC
transmissi
on
amount
4
ClampG4
21
L-100
Measure the output signal’s 0IRE DC level
(DRVPH V) and 100IRE amplitude (DRVH Vp-p)
and calculate ClampG = 100
× (1+(DRVPH -
BRTPL)/DRVH).
Brightness:
0000000
Contrast:
1111111
Continued on next page.
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