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TB1227CNG Datasheet(PDF) 68 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) 68 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
68
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 S42
00H 02H 05H 1BH 08H
MEASURING METHOD
T5
Y Sub-Contrast
Control Characteristic
B
B
B
B
B
A
FFH 00H
1FH
00H
——
(1) Connect both pin 21 (Digital Ys) and pin 22 (Analog Ys) to ground.
(2) Input TG7 sine wave signal whose frequency is 100kHz and video
amplitude is 0.7V to pin 31 (Y IN).
(3) Input 0.3V synchronizing signal to pin 51 (Sync IN).
(4) Set bus data so that contrast is maximum, drive is set at center
value and color is minimum.
(5) Set bus data on Y sub contrast at maximum (FF) and measure
amplitude (Vscmx) of pin 14 output (R OUT). Then, set data on Y
sub contrast at minimum (00), measure the same (Vscmn).
(6) From the results of the above step 5, find ratio between Vscmx and
Vscmn in conversion into decibel (∆Vscnt).
T6
Y2 Input Level
——
——
BFH 44H
(1) Set bus data so that contrast is maximum, Y sub contrast and drive
are at each center value.
(2) Input 0.3V synchronizing signal to pin 51 while inputting TG7 sine
wave signal whose frequency is 100kHz to pin 31 (TY IN).
(3) While increasing the amplitude of the sine wave signal, measure
video amplitude of signal 1 just before R output of pin 14 is
distorted. (Vy2d)


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