TA1276AFG Datasheet, PDF(51/83 Page) Toshiba Semiconductor – PAL/NTSC Video Chroma And Deflection IC For CTV

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TA1276AFG Datasheet, PDF (51/83 Pages) Toshiba Semiconductor – PAL/NTSC Video Chroma And Deflection IC For CTV

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Note

Parameter

Text Block

T1 AC Gain

Unicolor Adjustment

Characteristics

Brightness Adjustment

Characteristics

T4 Brightness Sensitivity

T5 White Peak Slice Level

T6 Black Peak Slice Level

TA1276AFG

SW33

SW34

SW35

Test Conditions (unless otherwise stated, VCC1 = 5 V, VCC2/VCC3/DEF VCC = 9 V, Ta = 25 Â± 3Â°C)

Switching Mode

SW37 SW38 SW39 SW51 SW52 SW53

Test Conditions

Text block common test conditions

SW13: A, SW15: C, SW18: ON, SW20: ON,

SW23: ON, SW24: ON, SW25: ON

1) Input signal 1 (f0 = 100 kHz, picture period amplitude = 0.2 Vp-p) to pin 78.

2) Measure the picture period amplitude of pins 15, 13, 11 (V41, V42, and

V43).

3) GR = V43/0.2

GG = V42/0.2

GB = V41/0.2

1) Input signal 1 (f0 = 100 kHz, picture period amplitude = 0.2 Vp-p) to pin 78.

2) Set the unicolor data to maximum (7F), center (40), and minimum (00) and

measure the pin 11 picture period amplitudes for each case.

(vuMAX, vuCNT, vuMIN)

3) Calculate the unicolor maximum and minimum amplitude ratios using

digital conversion. (âvu)

1) Input signal 2 to pin 78 and adjust the picture period amplitude output of

pin 11 to 1 Vp-p.

â 2) Measure the voltage of pin 11 when the brightness is changed to

maximum (FF), center (80), and minimum (00). (VbrMAX, VbrCNT,

VbrMIN)

1) Using the results obtained from T3, calculate the brightness sensitivity

from the following formula.

2) Gbr = (VbrMAX â VbrMIN)/256

1) Change the bus data and set the sub-contrast to maximum.

2) Connect an external power supply to pin 78 and increase the voltage

gradually from 5.8 V.

â 3) Measure the picture period amplitude voltage of pin 11 when pin 11Â°s

picture period is clipped (Vwps1).

4) Change the subaddress (05) data to (81) and repeat steps 1) to 3) above.

(Vwps2)

1) Repeat step 1) of T5.

2) Connect an external power supply to pin 78 and decrease the voltage

gradually from 5.8 V.

3) Measure the voltages of pins 11, 13, and 15 when their picture periods are

clipped.

2002-04-01

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