LA76075 查看數據表（PDF） - SANYO -> Panasonic

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LA76075

NTSC Color Television Sets / Color TV Single-Chip Signal Processor

SANYO -> Panasonic 

LA76075

Item

[Chroma Block]

ACC amplitude

characteristic 1

ACC amplitude

characteristic 2

B-Y/Y amplitude ratio

Color control

characteristic 1

Color control

characteristic 2

Color control sensitivity

Tint center

Tint control maximum

Tint control minimum

Tint control sensitivity

Demodulator output R-

Y/B-Y ratio

Demodulator output G-

Y/B-Y ratio

Measurement

Symbol

Point

Input

Signal

Measurement Procedure

Bus Condition

ACCM1

ACCM2

CLRBY

CLRMN

CLRMM

CLRSE

TINCEN

TINMAX

TINMIN

TINSE

RB

GB

Bout

30

Bout

30

30

30

30

30

30

30

30

30

29

28

30

29

C-1

0 dB

+6 dB

Measure the outputs for chroma inputs of 0 dB and +6

dB and substitute in the following formula.

ACCM1 = 20log

(+6 dBdata/0 dBdata)

C-1

–14 dB

Measure the outputs for chroma inputs of 0 dB and -14

dB and substitute in the following formula.

ACCM1 = 20log

(–14 dBdata/0 dBdata)

YIN : L77

C-1 : No signal

Measure V1, the Y output level.

Next supply the CIN signal (with only the

C-2

synchronization signal for YIN), measure V2, the

output level, and substitute in the following formula.

CLRBY = 100 × (V2/V1) + 15%

C-3

Measure V1, the output amplitude (Vp-p) for the

maximum color control setting, and V2, the output

amplitude (Vp-p) for the medium one, and substitute in

the following formula.

CLRMN = V1/V2

Color.1111111

(MAX)

Color.1000000

(NOM)

Measure V3, the output amplitude (Vp-p) for minimum

C-3

color control setting, and substitute in the following Color.0000000

formula.

(MIN)

CLRMN = 20 log (V1–V3)

Measure V4, the output amplitude (V{p-p}) for a color

C-3

control setting of 90, and V5, the output amplitude (Vp-

p) for one of 38, and substitute in the following

formula.

Color.1011010

Color.0100110

CLRSM = 100 × (V4–V5) / (V2 × 52)

C-1

Measure the output waveform and calculate the B-Y

angle.

TINT : 1000000

Measure the output waveform, calculate the B-Y

C-1

angle, and substitute in the following formula.

TINT : 1111111

TINMAX = B-Y angle - TINCEN

Measure the output waveform, calculate the B-Y

C-1

angle, and substitute in the following formula.

TINT : 0000000

TINMIN = B-Y angle - TINCEN

Measure A1, the angle for a tint control setting of 85,

C-1

and A2, the angle for one of 42, and substitute in the TINT : 1010101

following formula.

TINT : 0101010

TINSE = (A1–A2)/43

Supply the L77 signal to the YIN pin and adjust the red

and blue drive digital-to-analog converters until the Y

YIN : L77

C-1 : No signal

YIN : 0RE

C-3

output levels at pins 28 (RED OUT) and 30 (BLU OUT)

are closest to that at pin 29 (GRN OUT).

1. After the above adjustment, supply 0 RE to the YIN

pin and C-3 to the CIN pin, measure Vb, the BOUT

output amplitude (Vp-p), and Vr, the ROUT output

amplitude (Vp-p), and substitute in the following

Color : 1000000

B Drive

R Drive

Adjusted red and blue

drive values.

formula.

RB = Vr/Vb

Measure Vg, the GOUT output amplitude (V{p-p}), and Color : 1000000

substitute in the following formula.

B Drive

C-3

GB = Vg/Vb

Use adjusted red and blue

Use the adjusted red and blue drive values from the drive values from the RB

RB determination above.

determination above.

Continued on next page.

No. 5845-19/35

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