參數(shù)資料
型號： LA76850
廠商： Sanyo Electric Co.,Ltd.
英文描述： Monolithic Linear IC Black & White Television IC
中文描述： 單片線性集成電路黑色
文件頁數(shù)： 15/31頁
文件大小： 295K
代理商： LA76850
LA76850
NoA0017-15/31
Continued from preceding page.
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Y gamma effective
point1
YG1
L-100
Measure the output amplitude (0 to 100 IR) when
the Y gamma is 0 (GAM0). Then set Y gamma to 1
and measure the output amplitude (0 to 100 IR)
again (GAM1).
Calculate YG1 = (GAM1/GAM0)
×
100.
Measure the output amplitude (0 to 100 IR) when
the Y gamma is 0 (GAM0). Then set Y gamma to 2
and measure the output amplitude (0 to 100 IR)
again (GAM2).
Calculate YG2 = (GAM2/GAM0)
×
100.
Measure the output amplitude (0 to 100 IR) when
the Y gamma is 0 (GAM0). Then set Y gamma to 3
and measure the output amplitude (0 to 100 IR)
again (GAM3).
Calculate YG3 = (GAM3/GAM0)
×
100.
Measure the DC level (RGBBLK V) for the output
signal’s blanking period.
Y GAMMA = 1
Y gamma effective
point12
YG2
L-100
Y GAMMA = 2
Y gamma effective
point1
YG3
L-100
Y GAMMA = 3
Horizontal/vertical
blanking output
level
[OSD block]
RGBBLK
L-100
Bus control bit conditions:
Contrast = 63, Brightness = 63
Contrast: 0111111
Brightness:
0111111
OSD
Fast SW threshold
FSTH
L-0
O-2
Apply voltage to pin 15 and measure the voltage at
pin 15 at the point where the output signal switches
to the OSD signal.
Measure the output signal’s 50IRE amplitude
(CNTCB Vp-p).
Measure the OSD output amplitude
(OSDHB Vp-p).
Calculate OSDH =
50
×
(OSDHB/CNTCB)
Bus control bit conditions: Contrast = 127
Pin 14A: O-2
applied
L-50
Osd cont = 0111111
Digital osd = 1
Pin 15: 3.5V
Pin 14A: O-2
applied
OSD output
level
OSDH
L-0
O-2
[Y output block] (Cutoff, drive block)
Contrast:
1111111
Brightness:
01111111
Brightness control
(normal)
BRT63
L-0
Measure the 0IRE DC levels of the
respective output signals of Y output
(17)
Measure the 0IRE DC level of the output Signal of
Y output (17) and assign the Measured value to
BRTPC.
Measure the 0IRE DC level of the output Signal of
Y output (17) and assign the Measured value to
BRTPH.
Calculate BRT127 =
50
×
(BRTPH-BRTPC)/CNTHB.
Measure the 0IRE DC level of the output
Signal of Y output (17) and assign the
Measured value to BRTPL.
Calculate BRT0 =
50
×
(BRTPL-BRTPC)/CNTHB.
Measure the 0IRE DC levels (BTPM V) of the
respective output signals of Y output (17).
Vbiassns = (BRTPH-BTPM)/127
Brightness control
(normal-H)
BRT63H
L-0
Brightness:
0111111
Sub Bias: 1111111
Brightness:
1111111
Sub Bias: 1111111
Brightness control
(max)
BRT127
L-0
Brightness control
(min)
BRT0
L-0
Brightness:
0000000
Sub Bias: 1111111
Bright control
resolution
Vsiassns
L-50
Brightness:
0000000
Sub Bias:
1111111
Brightness:
0111111
Sub Bias: 0000000
Sub-bias control
resolution
Vsbiassns
L-50
Measure the 0IRE DC levels (SBTPM V) of the
respective output signals of Y output (17).
Vsbiassns = (BRTPCH-SBTPM)/127
17
17
17
17
17
17
17
17
17
17
17
17
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