參數(shù)資料
型號(hào)： 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(shù)： 25/44頁
文件大?。?/td> 289K
代理商： LA76818A
LA76818A
No.8047-31/44
Continued from preceding page.
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
Burst gate pulse
I phase
BGPPH
28
42
Y IN:
Horizontal/
vertical sync
signal
PAL
Measure the time from the left end of Hsync at pin
42 Y IN to the left end of the pin 28 FBP IN wave
form for Hsync period.
Horizontal output stop
voltage
Hstop
25
47
Y IN:
Horizontal/
vertical sync
signal
Decrease the current from a source connected to
pin 25 and measure the pin 25 voltage at which
HOUT stops.
Vertical screen size correction
Input signal
Symbol
Test point
Input signal
Test method
Bus conditions
PAL@64
Vertical
ramp
output
amplitude
NTSC@6
4
Vspal64
Vsnt64
23
Y IN:
Horizontal/
vertical sync
signal
PAL
NTSC
Monitor the pin 23 vertical ramp output and
measure the voltage at line 24 (22: NTSC) and line
310 (262: NTSC).
Vspal64 = Vline310-Vline24
Vsnt64 = Vline262-Vline22
PAL@0
Vertical
ramp
output
amplitude
NTSC@0
Vspal0
Vsnt0
23
Y IN:
Horizontal/
vertical sync
signal
PAL
NTSC
Monitor the pin 23 vertical ramp output and
measure the voltage at line 24 (22: NTSC) and line
310 (262: NTSC).
Vspal0 = Vline310-Vline24
Vsnt0 = Vline262-Vline22
VSIZE: 0000000
PAL@127
Vertical
ramp
output
amplitude
NTSC@127
Vspal127
Vsnt127
23
Y IN:
Horizontal/
vertical sync
signal
PAL
NTSC
Monitor the pin 23 vertical ramp output and
measure the voltage at line 24 (22: NTSC) and line
310 (262: NTSC).
Vspal27 = Vline310-Vline24
Vsnt127 = Vline262-Vline22
VSIZE: 1111111
Y IN
Hsync
FB PIN
T
Line 310
Line 24
Vertical ramp output
Line 310
Line 24
Vertical ramp output
Line 310
Line 24
Vertical ramp output
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