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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： | 13/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-20/44
RGB Output Block [Cutoff, Drive Block] Test Conditions
When measuring the RGB block, set the bus bit to 127(01111111) for Contrast.
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Measure the 0IRE DC levels of the respective output
signals of R output (19), G output (20), and B output
(21). Assign the measured values to BRTPCR,
BRTPCG, and BRTPCB V, respectively.
Normal
BRT63
19
20
21
BRT63 = (BRTPCR+BRTPCG+BRTPCB)/3
Brightness:
01111111
normal-H
BRT63H
Measure the 0IRE DC level of the output signal of
B output (21) and assign the measured value to
BRTPCBH.
Brightness: 0111111
B Bias: 11111111
Sub Bias: 1111111
Measure the 0IRE DC level of the output signal of
B output (21) and assign the measured value to
BRTPHB.
Max
BRT127
BRT127 = 50
× (BRTPHB-BRTPCB)/CNTHB
Brightness: 1111111
B Bias: 11111111
Sub Bias: 1111111
Measure the 0IRE DC level of the output signal of
B output (21) and assign the measured value to
BRTPLB.
Brightnes
s control
Min
BRT0
21
L-0
BRT0 = 50
× (BRTPLB-BRTPCBH)/CNTHB
Brightness: 0000000
B Bias: 11111111
Sub Bias: 1111111
Min
Vbias0
Measure the 0IRE DC levels (Vbias0* V) of the
respective output signals of R output (19), G
output (20), and B output (21).
*: R, G, and B
Sub-Brightness:
1111111
Max
Vbias255
Measure the 0IRE DC levels (Vbias255* V) of the
respective output signals of R output (19), G
output (20), and B output (21).
*: R, G, and B
Sub-Brightness:
1111111
Red/Green/Blue
Bias: 11111111
Measure the 0IRE DC levels (BAS80* V) of the
respective output signals of R output (19), G
output (20), and B output (21).
*: R, G, and B
Red/Green/Blue
Bias:01010000
Sub Bias: 1111111
Measure the 0IRE DC levels (BAS48* V) of the
respective output signals of R output (19), G
output (20), and B output (21).
Bias
(cutoff)
control
resolution
Vbiassns
19
20
21
L-50
Vbiassns* = (BAS80*-BAS48*)/32
Red/Green/Blue
Bias: 00110000
Sub Bias: 1111111
Measure the 0IRE DC levels (SBTPM* V) of the
respective output signals of R output (19), G
output (20), and B output (21).
Sub-bias control
resolution
Vsbiassns
19
20
21
L-50
Vsbiassns* = (BRTPC*-SBTPM*)
Sub-Brightness:
0101010
Contrast: 0111111
Red/Green/Blue
Bias: 11111111
Continued on next page.
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