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TB1227CNG Datasheet(PDF) 73 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) 73 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
73
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
09H 0AH 0CH 0DH 0EH
MEASURING METHOD
T20
Cutoff Control
Characteristic
B
B
B
B
B
A
80H 80H
FFH
00H
FFH
00H
FFH
00H
T21
Cutoff Center Level
——
80H 80H 80H
T22
Cutoff Variable Range
——
(1) Short circuit pin 31 (Y IN), pin 33 (B-Y IN) and pin 34 (R-Y IN) in
AC coupling.
(2) Input 0.3V synchronizing signal to pin 51 (Sync IN).
(3) Connect pin 21 (Digital Ys) and pin 22 (Analog Ys) to ground.
(4) Set bus data on brightness at center value.
(5) While changing data on cutoff from maximum to minimum,
measure video voltage of pin 13 (G OUT) to find maximum and
minimum values (max : Vcomx, min : Vcomn).
(6) Set cutoff data at center value and measure video voltage of pin 13
(G OUT) (Vcoct).
(7) On the condition that bus data with which Vcomx is obtained in
measurement of the above step 5 is Dcomx and bus data with
which Vcomn is obtained in the same is Dcomn, calculate number
of steps (∆Dcut).
∆Dcut = Dcomx − Dcomn
T23
Drive Variable Range
——
FFH
00H
FFH
00H
80H 80H 80H
(1) Short circuit pin 33 (B-Y IN) and pin 34 (R-Y IN) in AC coupling.
(2) Input a stepping signal whose amplitude in video period is 0.3V to
pin 31 (Y IN).
(3) Input 0.3V synchronizing signal to pin 51 (Sync IN).
(4) Connect pin 21 (Digital Ys) and pin 22 (Analog Ys) to ground.
(5) Set bus data so that contrast is maximum and Y sub contrast is
minimum.
(6) While changing drive data from minimum to maximum, measure
video amplitude of pin 13 (G OUT) to find maximum and minimum
values (max : Vdrmx, min : Vdrmn).
(7) Set drive data at center value and measure video amplitude of pin
13 (G OUT) (Vdrct). Calculate amplitude ratio of the measured
value to the maximum and minimum amplitudes measured in the
above step 6 respectively (DR+, DR−).


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