LA76850 データシートの表示（PDF） - SANYO -> Panasonic
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LA76850 Datasheet PDF : 31 Pages
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Input signal
Symbol
Y gamma effective
point1
YG1
Y gamma effective
point12
YG2
Y gamma effective
point1
YG3
Horizontal/vertical
blanking output
level
[OSD block]
RGBBLK
OSD
Fast SW threshold
OSD output
level
FSTH
OSDH
[Y output block] (Cutoff, drive block)
Brightness control
(normal)
BRT63
Brightness control
(normal-H)
BRT63H
Brightness control
(max)
BRT127
Brightness control
(min)
BRT0
Bright control
resolution
Sub-bias control
resolution
Vsiassns
Vsbiassns
LA76850
Test point
17
17
17
17
Input signal
L-100
L-100
L-100
L-100
Test method
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.
Bus conditions
Y GAMMA = 1
Y GAMMA = 2
Y GAMMA = 3
L-0
17
O-2
L-50
17
L-0
O-2
L-0
17
L-0
17
L-0
17
L-0
17
L-50
17
L-50
17
Bus control bit conditions:
Contrast = 63, Brightness = 63
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
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
Measure the 0IRE DC levels (SBTPM V) of the
respective output signals of Y output (17).
Vsbiassns = (BRTPCH-SBTPM)/127
Contrast: 0111111
Brightness:
0111111
Pin 14A: O-2
applied
Osd cont = 0111111
Digital osd = 1
Pin 15: 3.5V
Pin 14A: O-2
applied
Contrast:
1111111
Brightness:
01111111
Brightness:
0111111
Sub Bias: 1111111
Brightness:
1111111
Sub Bias: 1111111
Brightness:
0000000
Sub Bias: 1111111
Brightness:
0000000
Sub Bias:
1111111
Brightness:
0111111
Sub Bias: 0000000
NoA0017-15/31
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