LA76818 Ver la hoja de datos (PDF) - Unspecified
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LA76818 Datasheet PDF : 45 Pages
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Technical Note of LA76818
2002/01/23
Video SW
1 Video signal selector
The switch of Int./Ext. video input
0 = Internal
1 = External
Trap Test
Sound trap control.
3 Sound trap control for testing
Filter System
3 Select Y/C Filter mode
Select the trap frequency and the peaking frequency of color trap filter of Y.
・ 3.58MHz Trap Mode / peaking at 2.2MHz
・ 4.43MHz Trap Mode/ peaking at 2.7MHz
・ No trap (High band mode)/
・ 4.286MHz Trap Mode/ peaking at 2.3 MHz
Y Block
Chroma Block
0
3.58MHz Trap
3.58MHz unsymmetrical
1
3.58MHz Trap
3.58MHz symmetrical
2
4.43MHz Trap
4.43MHz unsymmetrical
3
4.43MHz Trap
4.43MHz symmetrical
4
No trap
3.58MHz unsymmetrical
5
No trap
3.58MHz symmetrical
6
No trap
4.43MHz unsymmetrical
7
No trap
4.43MHz symmetrical
8 ~ 15
4.286MHz Trap
4.43MHz symmetrical
The switch of chroma band-pass filter.
Unsymmetrical Mode
Symmetrical Mode
Gray Mode
1 Service Test Mode (White/Gray)
Switch to white level when Cross B/W is set as ‘10’ or ‘11’.
0 : White(100%)
1 : Gray (15%)
Cross B/W
2 Service Test Mode ( normal/Cross/Black/White)
It is possible to generate crosshatch, white level, black level pattern.
00 = TV operating mode
01 = Black pattern
10 = White pattern
11 = Crosshatch pattern
• Set the Cross B/W function as “black pattern” and input a chroma signal, then a
differential RGB output can be achieved. (Switch on the BLK Defeat SW, the
blanking pulse can also be defeated.)
• Set the Cross B/W function as “black pattern” and minimize color level, then the
DC level of RGB can be used for adjusting the cutoff of CRT.
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