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TB1227CNG Datasheet(PDF) 66 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) 66 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
66
TEXT SECTION
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
00H 02H
MEASURING METHOD
T1
Y Color Difference
Clamping Voltage
B
B
B
B
B
A
FFH 00H
(1) Short circuit pin 31 (Y 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) Measure voltage at pin 31, pin 34 and pin 33 (Vcp31, Vcp34,
Vcp33).
(1) Input TG7 sine wave signal whose frequency is 100kHz and video
amplitude is 0.7V to pin 31 (Y IN).
(2) Input 0.3V Synchronizing Signal to pin 51 (Sync IN).
(3) Connect both pin 21 (Digital Ys) and pin 22 (Analog Ys) to ground.
(4) Set bus data so that Y sub
contrast and drive are set at
each center value and color is
minimum.
(5) Varying data on contrast from
maximum (FF) to minimum (00),
measure maximum and
minimum amplitudes of
respective outputs of pin 14 (R
OUT), pin 13 (G OUT) and pin
12 (B OUT) in video period, and
read values of bus data at the
same time.
T2
Contrast Control
Characteristic
——
FFH
80H
00H
00H
Also, measure the respective amplitudes with the bus data set to
the center value (80).
(Vc12mx, Vc12mn, D12c80)
(Vc13mx, Vc13mn, D13c80)
(Vc14mx, Vc14mn, D14c80)
(6) Find ratio between amplitude with maximum unicolor and that with
minimum unicolor in conversion into decibel (∆V13ct).
T3
AC Gain
———
——
In the test condition of Note T2, find output / input gain (double) with
maximum contrast.
G = Vc13mx / 0.7V


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