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參數資料
| 型號： | LA76818A |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 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： | 26/44頁 |
| 文件大小： | 289K |
| 代理商： | LA76818A |
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LA76818A
No.8047-32/44
High-voltage dependent vertical size correction
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Vertical size
correction@0
Vsizecomp
23
Y IN:
Horizontal/
vertical sync
signal
PAL
Monitor the pin 23 vertical ramp output and
measure the voltage at the line 24 and line 310
with VCOMP = 000.
Va = Vline310-Vline24
Apply 4.1V to pin 13 and measure the voltage at
the line 24 and line 310 again. Calculate as
follows:
Va = Vline310-Vline24
Vsizecomp = Vb/Va
VCOMP: 000
Vertical Screen Position Adjustment
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
PAL@32
Vertical
ramp DC
voltage
NTSC@32
Vdcpal32
Vdcnt32
23
Y IN:
Horizontal/
vertical sync
signal
PAL
NTSC
Monitor the pin 23 vertical ramp output and
measure the voltage at line 167. (PAL)
Monitor the pin 23 vertical ramp output and
measure the voltage at line 142. (NTSC)
PAL@0
Vertical
ramp DC
voltage
NTSC@0
Vdcpal0
Vdcnt0
23
Y IN:
Horizontal/
vertical sync
signal
PAL
NTSC
Monitor the pin 23 vertical ramp output and
measure the voltage at line 167. (PAL)
Monitor the pin 23 vertical ramp output and
measure the voltage at line 142. (NTSC)
VDC: 000000
PAL@63
Vertical
ramp DC
voltage
NTSC@63
Vdcpal63
Vdcnt63
23
Y IN:
Horizontal/
vertical sync
signal
PAL
NTSC
Monitor the pin 23 vertical ramp output and
measure the voltage at line 167. (PAL)
Monitor the pin 23 vertical ramp output and
measure the voltage at line 142. (NTSC)
VDC: 111111
Continued on next page.
Line 310
Line 24
Vertical ramp output
Line 167
Vertical ramp output
Line 167
Vertical ramp output
Line 167
Vertical ramp output
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