LA76835 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA76835

Monolithic Linear IC For PAL/NTSC Color Television Sets VIF/SIF/Y/C/Deflection Implemented in a Single Chip

SANYO -> Panasonic 

Continued from preceding page.

Parameter

Symbol

R-Y/B-Y

RB

Demodulation

output ratio

R-Y/B-Y

Demodulation

output ratio

G-Y/B-Y

Demodulation

angle R-Y/B-Y

GB

ANGRB1

Demodulation

angle R-Y/B-Y

Control 1

Demodulation

angle R-Y/B-Y

Control 2

ANGRB2

ANGRB3

LA76835NM

Test point

18

19

20

Input signal

YIN: L77

C-1:

No signal

YIN: 0 IRE

C-3

Test method

Input a signal to YIN and adjust DAC in R and B

drives so that the Y output levels at pins 18 and 20

become as close to the level at 19 as possible. (*1)

After that, input 0 IRE to YIN and C-3 to CIN.

Measure BOUT output amplitude Vb and ROUT

output amplitude Vr and calculate RB=Vr/Vb.

Bus conditions

Color: 1000000

Adjustment value in

B and R drives: *1

C-3

19

C-1

20

18

Measure GOUT output amplitude Vg and

calculate GB = Vg/Vb.

For the R/B Drive, the adjustment value: *1

applies.

Measure each output level of the BOUT and ROUT

and calculate the angles of the B-Y axis and R-Y

axis.

ANGBR1 = (R-Y angle)-(B-Y angle)

Color: 1000000

Adjustment value in

B and R drives: *1

C-1

20

18

C-1

20

18

With R-Y/B-Y angle set at maximum, carry out the

same measurement as for ANGRB1.

ANGBR2 = (R-Y angle)-(B-Y angle)

R-Y/B-Y angle

1111

With R-Y/B-Y angle set at minimum, carry out the

same measurement as for ANGRB1.

ANGBR3 = (R-Y angle)-(B-Y angle)

Reset R-Y/B-Y angle to 1000.

R-Y/B-Y angle

0000

Demodulation

angle G-Y/B-Y

Demodulation

angle G-Y/B-Y control

Killer operating

point 2

ANGGB1

ANGGB2

KILL

Killer operating

point 4

KILL

Killer operating

point difference

Chroma VCO

free-running

frequency

APC pull-in range (+)

D_KILL

CVCOF

PLINP0

APC pull-in range (-)

PLINN0

Static phase error (+)

SPER_P

C-1

19

C-1

19

C-3

20

Measure each output level of the GOUT and

calculate the angle of the G-Y axis.

ANGBG1 = (G-Y angle)-(B-Y angle)

Measure each output level of the GOUT and

calculate the angle of the G-Y axis.

ANGBG2 = (G-Y angle)-(B-Y angle)

Reduce the input signal until the output level

becomes 50mVp-p or less. Measure the input level

at that moment.

G-Y_Angle: 1

Filter Sys: 1

C. Bypass: 0

ColorKillerope.: 2

C-3

20

Reduce the input signal until the output level

becomes 50mVp-p or less. Measure the input level

at that moment.

Filter Sys: 1

C. Bypass: 0

ColorKillerope.: 4

D_KILL = KILL-KILL4

CIN:

Measure oscillation frequency f.

44

No signal

CVCOF = f-3579545 (Hz)

C-1

20

C-1

20

C-1

20

Decrease the chroma fsc frequency from

3.579545MHz+1000Hz and measure the frequency

at which the VCO locks.

Increase the chroma fsc frequency from

3.579545MHz-1000Hz and measure the

frequency at which the VCO locks.

Set the fsc frequency to 3.579545MHz+200Hz,

measure the B-Y axis angle.

SPER_P = B-Y axis angle-TINCEN

Continued on next page.

No.7962-18/50

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