LA76850 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA76850

Black & White Television IC

SANYO -> Panasonic 

Continued from preceding page.

Input signal

Symbol

<Vertical screen size correction>

Vertical ramp output

Amplitude

PAL@64

NTSC@64

Vspal64

Vsnt64

LA76850

Test point

Input signal

Test method

Bus conditions

Y IN:

Monitor the pin 18 vertical ramp output and

18

Horizontal/

measure the voltage at line 24 (22:NTSC) and line

vertical sync 310 (262:NTSC).

signal

Calculate as follows:

PAL

Vspal64 = Vline310-Vline24

NTSC

Vsnt64 = Vline262-Vline22

Vertical ramp output

Vertical ramp output

amplitude PAL@0

NTSC@0

Vspal0

Vsnt0

Line 310

Line 24

Y IN:

Monitor the pin 18 vertical ramp output and

VSIZE: 0000000

18

Horizontal/

measure the voltage at line 24 (22:NTSC) and line

vertical sync 310 (262:NTSC).

signal

Calculate as follows:

PAL

Vspal0 = Vline310-Vline24

NTSC

Vsnt0 = Vline262-Vline22

Vertical ramp output

Vertical ramp output

amplitude PAL@127

NTSC@127

Vspal127

Vsnt127

Line 310

Line 24

Y IN:

Monitor the pin 18 vertical ramp output and

VSIZE: 1111111

18

Horizontal/

measure the voltage at line 24 (22: NTSC) and line

vertical sync 310 (262: NTSC).

signal

Calculate as follows:

PAL

Vspal27 = Vline310-Vline24

NTSC

Vsnt127 = Vline262-Vline22

Vertical ramp output

<High-voltage dependent vertical size correction>

Vertical size

correction@0

Vsizecomp

18

Line 310

Line 24

Y IN:

Horizontal/

vertical sync

signal

PAL

Monitor the pin 18 vertical ramp output and

measure the voltage at the line 24 and line 310

with VCOMP = 000. Calculate as follows:

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

Calculate as follows:

Vsizecomp = Vb/Va

Vertical ramp output

VCOMP: 000

Line 310

Line 24

Continued on next page.

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