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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： | 11/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-19/44
OSD Block Test Conditions
When measuring the OSD block, set the bus bit to 63(0111111) for Contrast, 63(0111111) for Brightness.
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
OSD
Fast SW threshold
FSTH
21
L-0
O-2
Apply voltage to pin 17 and measure the voltage at
pin 17 at the point where the output signal
switches to the OSD signal.
Pin 16A: O-2
applied
L-50
Measure the output signal’s 50IRE amplitude.
CNTCR [Vp-p]
Measure the OSD output amplitude.
OSDHR [Vp-p]
Red RGB output
level
ROSDC
19
L-0
O-2
ROSDC = 50
× (OSDHR /CNTCR)
Pin 17: 3.5V
Pin 14A: O-2
applied
L-50
Measure the output signal’s 50IRE amplitude.
CNTCG [Vp-p]
Measure the OSD output amplitude.
OSDHG [Vp-p]
Green RGB output
level
GOSDC
20
L-0
O-2
GOSDC = 50
× (OSDHG /CNTCG)
Pin 17: 3.5V
Pin 15A: O-2
applied
L-50
Measure the output signal’s 50IRE amplitude.
CNTCB [Vp-p]
Measure the OSD output amplitude.
OSDHB [Vp-p]
Blue RGB output
level
BOSDC
21
L-0
O-2
BOSDC = 50
× (OSDHB/CNTCB)
Pin 17: 3.5V
Pin 16A: O-2
applied
Analog OSD R output
level
19
L-0
O-1
Measure the amplitudes at point A (0.35V portion
of the input signal 0-1) and point B (0.7V portion of
the input signal 0-1) of the output signal. Assign
the measured values to RGBLR Vp-p and RGBHR
Vp-p, respectively.
Pin 17: 3.5V
Pin 14A: O-1
applied
Gain match
RRGB
RRGB = RGBLR/CNTCR.
linearity
LRRGB
LRRGB = 100
× (RGBLR/RGBHR).
Analog OSD G output
level
20
L-0
O-1
Measure the amplitudes at point A (0.35V portion
of the input signal 0-1) and point B (0.7V portion of
the input signal 0-1) of the output signal. Assign
the measured values to RGBLG Vp-p and RGBHG
Vp-p, respectively.
Pin 17: 3.5V
Pin 15A: O-1
applied
Gain match
GRGB
GRGB = RGBLG/CNTCG.
linearity
LGRGB
LGRGB = 100
× (RGBLG/RGBHG).
Analog OSD B output
level
21
L-0
O-1
Measure the amplitudes at point A (0.35V portion
of the input signal 0-1) and point B (0.7V portion of
the input signal 0-1) of the output signal. Assign
the measured values to RGBLB Vp-p and RGBHB
Vp-p, respectively.
Pin 17: 3.5V
Pin 16A: O-1
applied
Gain match
BRGB
BRGB = RGBLB/CNTCB.
linearity
LBRGB
LBRGB = 100
× (RGBLB/RGBHB).
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