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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： | 10/44頁 |
| 文件大?。?/td> | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-18/44
Continued from preceding page.
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
With the input signal’s continuous wave = 3.0MHz,
measure the output signal’s continuous wave
amplitude. F05S32 [Vp-p]
APF
Sharp32T5
Sharp32T5 = 20Log (F05S32/PEAKDC)
FILTER SYS: 0000
Sharpness: 100000
Y APF: 1
With the input signal’s continuous wave = 3.0MHz,
measure the output signal’s continuous wave
amplitude. F05S63 [Vp-p]
Max
Sharp63T5
Sharp63T5 = 20Log (F05S63/PEAKDC)
FILTER SYS: 0000
Sharpness: 111111
Y APF: 1
With the input signal’s continuous wave = 3.0MHz,
measure the output signal’s continuous wave
amplitude. F05S0 [Vp-p]
Sharpnes
s variable
range
Min
Sharp0T5
21
L-CW
Sharp0T5 = 20Log (F05S0/PEAKDC).
FILTER SYS: 1000
Sharpness: 000000
Y APF:1
1
WPL1
Set WPL to 00, apply a 3.0 V level to pin 13, and
measure the output amplitude (pedestal to white).
Gradually increase the input signal amplitude and
measure the output amplitude (pedestal to white)
when the output clips (WP1).
WPL1=WP1/CNTCB1*100
WPL = 00
2
WPL2
Set WPL to 01, gradually increase the input signal
amplitude and measure the output amplitude
(pedestal to white) when the output clips (WP2).
WPL2=WP2/CNTCB1*100
WPL = 01
3
WPL3
Set WPL to 10, gradually increase the input signal
amplitude and measure the output amplitude
(pedestal to white) when the output clips (WP3).
WPL3=WP3/CNTCB1*100
WPL = 10
White
peak
limiter
operating
point
4
WPL4
21
L-100
Set WPL to 10, gradually increase the input signal
amplitude and measure the output amplitude
(pedestal to white) when the output clips (WP4).
WPL4=WP4/CNTCB1*100
WPL = 10
1
YG1
21
Measure the output amplitude (0 to 100 IR) when
Y GAMMA is 0. After that, set Y GAMMA to 1 and
measure the output amplitude (0 to 100 IR). This is
GAM1. Calculate YG1 with the formula YG1 =
GAM1/GAM0 * 100.
Y GAMMA = 1
2
YG2
21
Measure the output amplitude (0 to 100 IR) when
Y GAMMA is 0. After that, set Y GAMMA to 2 and
measure the output amplitude (0 to 100 IR). This is
GAM2. Calculate YG1 with the formula YG2 =
GAM2/GAM0 * 100.
Y GAMMA = 2
Y gamma
effective
point
3
YG3
21
L-100
Measure the output amplitude (0 to 100 IR) when
Y GAMMA is 0. After that, set Y GAMMA to 3 and
measure the output amplitude (0 to 100 IR). This is
GAM3. Calculate YG3 with the formula YG3 =
GAM3/GAM0 * 100.
Y GAMMA = 3
GRAY MODE level
GRAY
21
Measure the DC level (deviation from pedestal) of
pin21, and transfer IRE.
CROSS B/W:2
GRAY MODE:1
Horizontal/vertical
blanking output
level
RGBBLK
21
L-100
Measure the DC level (RGBBLK V) for the output
signal’s blanking period.
Pre-shoot adjust1
PreShoot1
21
L-100
Measure the pre-shoot width (Tpre) and
over-shoot width (Tover) at rise of 100IRE
amplitude of the output signal.
PreShoot = Tpre/Tover.
Pre-shoot adj. = 00
Filter Sys: 000
Sharpness = 111111
Pre-shoot adjust2
PreShoot2
21
L-100
With Pre-shoot adj. = 11, carry out the same
measurement as for the case of Pre-Shoot 1.
Pre-shoot adj. = 11
Filter Sys: 000
Sharpness = 111111
Over-shoot adjust
OverShoot
21
L-100
With Over-shoot adj. = 11 Measure the pre-shoot
width (Tpre) and over-shoot width (Tover) at rise of
100IRE amplitude of the output signal.
OverShoot = Tover/Tpre.
Over-shoot adj. = 11
Filter Sys: 000
Sharpness = 111111
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