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TB1227CNG Datasheet(PDF) 37 Page - Toshiba Semiconductor

Part No. TB1227CNG
Description  VIDEO, CHROMA AND SYNCHRONIZING SIGNALS PROCESSING IC FOR PAL / NTSC / SECAM SYSTEM COLOR TV
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Maker  TOSHIBA [Toshiba Semiconductor]
Homepage  http://www.semicon.toshiba.co.jp/eng
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TB1227CNG Datasheet(HTML) 37 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
37
TEST CONDITION (Unless otherwise specified : H, RGB VCC = 9V ; VDD, Fsc VDD, Y / C VCC = 5V ; Ta = 25±3°C)
SW MODE
SUB-ADDRESS & BUS DATA
NOTE
ITEM
S39
S42
S44
S45
S51
04H 08H 0FH 10H 13H 14H
MEASURING METHOD
Y4
Chroma Trap
Attenuation (4.43MHz)
A
C
A
B
A
20H 04H
Vari-
able
Vari-
able
Vari-
able 03H
(1) Set the 358 TRAP mode to AUTO by setting bus data.
(2) Set the bus data so that Q of chroma trap is 1.5.
(3) Set the bus data so that f0 of chroma trap is 0.
(4) Input TG7 sine wave signal whose frequency is 4.43MHz and video amplitude is
0.5V to pin 45 (Y1 IN).
(5) Perform the same measurement as the steps 5 through 7 of the preceding item Y3.
The measurement result shall be expressed as Gtr4.
Y5
Chroma Trap
Attenuation (SECAM)
(1) Set the bus data so that the 358 TRAP mode is AUTO and the Dtrap is ON.
(2) Set the bus data so that Q of chroma trap is 1.5.
(3) Set the bus data so that f0 of chroma trap is 0.
(4) Input SECAM signal whose amplitude in video period is 0.5V to pin 45 (Y1 IN).
(5) Perform the same measurement as the steps 5 through 7 of the preceding item Y3
to find the maximum attenuation (Gtrs).
Y6
Yγ Correction Point
Vari-
able
80H 00H BAH
(1) Connect the power supply to pin 45 (Y1 IN).
(2) Turn off Yγ by setting the bus data.
(3) While raising the supply voltage from the level
measured in the preceding item Y1, measure
voltage change characteristic of Y1 output at pin
37.
(4) Set the bus data to turn on Yγ.
(5) Perform the same measurement as the above
step 3.
(6) Find a gamma (γ) point from the measurement
results of the steps 3 and 5.
γp = Vr÷0.7V
Y7
Yγ Correction Curve
From the measurement in the above item Y6, find gain of the portion that the γ
correction has an effect on.


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