LA76070 View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LA76070

NTSC Color Television IC

SANYO -> Panasonic 

Continued from preceding page.

LA76070

Parameter

Demodulation angle B-Y/R-Y

Demodulation angle B-Y/G-Y

Killer operating point

Chrominance VCO free-running

frequency

Chrominance pull-in range (+)

Chrominance pull-in range (–)

Auto flesh characteristic 73°

Auto flesh characteristic 118°

Auto flesh characteristic 163°

Symbol

ANGBR

ANGBG

KILL

CVCOF

PULIN +

PULIN –

AF073

AF118

AF163

Measurement

point

Input signal

30

C-1

28

29

C-1

30

C-3

15

CIN

No signal

30

C–1

30

C–1

30

C–4

28

30

C–4

28

30

C–4

28

Measurement procedure

Bus and other conditions

Measure the BOUT and ROUT output levels,

calculate the angles of the B-Y and R-Y axes,

and determine ANGBR as

<the R-Y angle> – <the B-Y angle>.

Measure the GOUT output level, calculate the

angle of the G-Y axis, and determine ANGBG

as <the G-Y angle> – <the B-Y angle>

Gradually lower the input signal level, and

measure the input signal level at the point the

output level falls under 150 mV p-p

Measure the oscillator frequency f, and

determine CVCOF from the following formula.

CVCOF = f – 3579545 (Hz)

Gradually lower the input signal subcarrier

frequency starting from 3.57545 MHz +

2000 Hz, and measure the frequency when

the output waveform locks

Gradually raise the input signal subcarrier

frequency starting from 3.57545 MHz –

2000 Hz, and measure the frequency when the

output waveform locks

With Auto Flesh = 0, measure the level that

corresponds to 73° for the BOUT and ROUT

output waveforms, and calculate the angle

AF073A.

With Auto Flesh = 1, determine the angle

AF073B in the same way.

Calculate AF073 from the following formula.

AF073 = AF073B – AF073A

TR22:

Auto flesh:

0*******

TR22:

Auto flesh:

1*******

With Auto Flesh = 0, measure the level that

corresponds to 118° for the BOUT and ROUT

output waveforms, and calculate the angle

AF118A.

With Auto Flesh = 1, determine the angle

AF118B in the same way.

Calculate AF118 from the following formula.

AF118 = AF118B – AF118A

TR22:

Auto flesh:

0*******

TR22:

Auto flesh:

1*******

With Auto Flesh = 0, measure the level that

corresponds to 163° for the BOUT and ROUT

output waveforms, and calculate the angle

AF163A.

With Auto Flesh = 1, determine the angle

AF163B in the same way.

Calculate AF163 from the following formula.

AF163 = AF163B – AF163A

TR22:

Auto flesh:

0*******

TR22:

Auto flesh:

1*******

No. 5844-17/27

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