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LA76818

The BUS Control Functions of LA76818 (Tentative)

SANYO -> Panasonic 

Technical Note of LA76818

2002/01/23

Bright ABL Threshold 3 Align brightness ABL threshold

Bright Mid Stop Defeat 1 Disable brightness mid stop

In order to make the design of TV chassis more easier, ABL(Auto Beam

Limiter)function can be controlled by BUS.

Bright ABL Defeat： The defeat SW of Brightness ABL

1 = ABL Defeat ON

0 = ABL Defeat OFF

Bright ABL Threshold: Adjust the start operating point of Brightness ABL

Bright Mid Stop Defeat: The defeat switch for the limit operation of brightness ABL by

brightness control

1 = Disable limit operation

0 = Enable limit operation

RGB Temp. SW

0 = -1VBE.

1 = Flat

1 Select the temperature characteristics for RGB DC output.

R/B Gain Balance

4 R-Y/B-Y Gain Balance

Adjust the demodulation ratio of R-Y and B-Y.

R/B Angle

4 R-Y/B-Y Angle

Adjust the demodulation angle of R-Y and B-Y.

B-Y DC Level

4 B-Y DC Level ( White-Balance )

R-Y DC Level

4 R-Y DC Level ( White-Balance )

*Fine adjust the offset of the DC level (white balance) when switch PAL/SECAM

system. SECAM decoder is using external IC.

Audio SW

1

The switch of Int./Ext. audio input.

0 = Internal

1 = External

Volume

7 Customer volume control

Sound volume control (attenuation mode)

Maximum gain = 0dB, step = 0.5dB

OVER.MOD.SW

Drive control test mode

1:Test mode.

0:Nomal mode

1 Select over moduration function

VOL.FIL

1 Disable volume DAC filter

In order to get rid of the “POP” noise which is caused by the DAC of volume control,

volume filter is built-in into the IC.

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