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TB1227CNG Datasheet(PDF) 87 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) 87 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
87
TEST CONDITION (Unless otherwise specified : H, RGB VCC = 9V ; VDD, Fsc VDD, Y / C VCC = 5V ; Ta = 25±3°C ; BUS = preset value)
SW MODE
SUB-ADDRESS & BUS DATA
NOTE
ITEM
S21 S22 S31 S33 S34 S51
01H 15H
MEASURING METHOD
T74
ABL Point
Characteristic
B
B
B
B
B
A
——
FFH
10H
90H
F0H
———
(1) Input TG7 sine wave signal (f = 4MHz, video amplitude = 0.5V) to
pin 31 (Y2 IN).
(2) Short circuit pin 23 (Analog R IN), pin 25 (Analog G IN) and pin 26
(Analog B IN) in AC coupling.
(3) Set bus data so that brightness is maximum and ABL gain is at
center value, and supply pin 16 with external supply voltage. While
turning down voltage supplied to pin 16 gradually from 7V,
measure voltage at pin16 when the voltage supplied to pin 12
decreases by 0.3V in three conditions that data on ABL point is set
at minimum, center and maximum values respectively. (Vablpl,
Vablpc, Vablph)
T75
ACL Characteristic
——
——
———
(1) Input TG7 sine wave signal (f = 4MHz, video amplitude = 0.5V) to
pin 31 (Y2 IN).
(2) Input 0.3V synchronizing signal to pin 51 (Sync IN).
(3) Measure video amplitude at pin 12. (Vacl1)
(4) Measure DC voltage at pin 16 (ABCL).
(5) Supply pin 16 with a voltage that the voltage measured in the
above step 4 minus 2V.
(6) Measure video amplitude at pin 12 (Vacl2) and its ratio to the
amplitude measured in the above step 3.
Vacl = 20ℓog (Vacl2 / Vacl1)
T76
ABL Gain
Characteristic
——
FFH
00H
10H
1CH
———
(1) Short circuit pin 31 (Y2 IN), pin 34 (R-Y IN) and pin 33 (B-Y IN) in
AC coupling.
(2) Input 0.3V synchronizing signal to pin 51 (Sync IN).
(3) Set bus data on brightness at maximum and measure video DC
voltage at pin 12 (Vmax).
(4) Measure voltage at pin 16 which is being supplied with the voltage
measured in the step 5 of the preceding Note 75.
(5) Changing setting of bus data on ABL gain at minimum, center and
maximum values one after another, measure video DC voltage at
pin 12. (Vabl1, Vabl2, Vabl3)
(6) Find respective differences of Vabl1, Vabl2 and Vabl3 from the
voltage measured in the above step 3.
Vabll = Vmax − Vabl1
Vablc = Vmax − Vabl2
Vablh = Vmax − Vabl3


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