LA76814 Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LA76814

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

SANYO -> Panasonic 

Chroma Block Test Conditions

Parameter

ACC

Charac-

amplitude teristics 1

Symbol

ACCM1

Test point

Bout

21

Charac-

teristics 2

ACCM2

Bout

21

B-Y/Y amplitude

ratio

CLRBY

21

Color

Charac-

CLRMN

control

teristics 1

21

Charac-

CLRMM

teristics 2

21

Color control

sensitivity

CLRSE

21

Tint center

TINCEN

21

LA76814

Input signal

C-1

0dB

+6dB

C-1

-14dB

YIN: L77

C-1:No signal

C-2

C-3

C-3

C-3

C-1

Test method

Measure the output when 0dB is applied to the

chroma input and the output amplitude when +6dB

is applied to the chroma input and calculate the

ratio between them.

ACCM1 = 20Log (+6dBdata/0dBdata)

Measure the output when 0dB is applied to the

chroma input and the output amplitude when

-14dB is applied to the chroma input and calculate

the ratio between them..

ACCM2 = 20Log (-14dBdata/0dBdata)

Measure the Y system’s output level.

···· V1

Input a signal to the CIN (only sync signal to the

YIN) and measure the output level to calculate as

follows:

CLRBY = 100×(V2/V1)+15%

Measure the output amplitude V1 at color control

MAX mode and output amplitude V2 at color

control NOM mode.

CLRMN = V1/V2

Measure the output amplitude V3 at color control

MIN mode.

CLRMM = 20Log (V1/V3)

Measure the output amplitude V4 at color control

90 mode and output amplitude V5 at color control

38 mode to calculate as follows:

CLRSE = 100×(V4-V5)/(V2×52)

Measure each part of the output waveform and

calculate the B-Y axis angle.

Bus conditions

Color: 1111111 (Max)

Color: 1000000 (NOM)

Color: 0000000 (Min)

Color: 1011010

Color: 0100110

TINT: 1000000

Tint

control

MAX

MIN

TINMAX

TINMIN

Tint control sensitivity

TINSE

Demodulation

RB

output ratio

R-Y/B-Y

C-1

21

Measure each part of the output waveform and

calculate the B-Y axis angle as follows:

TINT: 1111111

TINMAX = B-Y axis angle-TINCEN

C-1

21

Measure each part of the output waveform and

calculate the B-Y axis angle as follows:

TINT: 0000000

TINMIN = B-Y axis angle-TINCEN

C-1

21

Measure the angle A1 at TINT control 85 mode

and angle A2 at TINT control 42 mode.

TINT: 1010101

TINT: 0101010

TINSE = (A1-A2)/43

YIN: L77

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

Color: 1000000

19

C-1:

drives so that the Y output levels at pins 17 and 19 Adjustment value in

No signal

become as close to the level at 18 as possible. (*1) B and R drives: *1

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

20

YIN: 0 IRE

Measure BOUT output amplitude Vb and ROUT

C-3

output amplitude Vr and calculate RB=Vr/Vb.

21

Demodulation

output ratio

G-Y/B-Y

Demodulation

angle R-Y/B-Y

GB

ANGRB

C-3

20

C-1

21

19

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.

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

Color: 1000000

Adjustment value in

B and R drives: *1

Continued on next page.

No.A0253-13/35

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