LA76818 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA76818

The BUS Control Functions of LA76818 (Tentative)

SANYO -> Panasonic 

Technical Note of LA76818

2002/01/23

This filter is set ‘OFF’ when IC tester is used for measuring.

0 : TV operating mode

1 : Filter OFF

RF AGC Delay

6 Align RF AGC threshold

Adjust RF AGC Delay point

De-emphasis TC

1 Select De-emphasis Time Constant

Switch of De-emphasis time constant

0 = 50uS

1 = 75uS

VIF System SW

2 Select 38.0/38.9/45.75/58.75

IF frequency switch

00 = 38.0MHz

01 =38.9MHz

10 = 45.75MHz

11 =39.5MHz

SIF System SW

SIF frequency switch

00 = 4.5MHz

10 = 6.0MHz

2 Select 4.5/5.5/6.0/6.5 Mhz

01 =5.5MHz

11 =6.5MHz

FM Gain

1 Select FM Output Level

Switch of FM detection output

0:900mVrms @±50KHz.deviation

1:900mVrms @±25KHz.deviation

IF AGC Defeat

1 Disable IF and RF AGC

Usually, the IF block of the television is not in operation when the input signal is VTR

signal. But, it is possible that the output of IF signal or noise signal of IF circuit may

interfere the video signal in some expected conditions. In this case, we can minimize the

gain of IF AGC to solute this problem.

0 : Normal mode

1 : Minimize the gain of VIF amplifier.

Video Level

3 Align IF video level

The video detection output is adjusted to 2Vpp.

The accuracy of video signal is 2Vpp±0.1Vpp after adjustment.

FM Level

5 Align WBA output level

The output of FM is adjusted to 900mVrms. The accuracy of FM output after

adjustment is 900mVrms± 10 mV.

Pre/Over Select

1 Select Pre/Over-shoot adjustment.

0 = Pre-shoot adjustment.

12/ 46

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