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TB1227CNG Datasheet(PDF) 76 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) 76 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
76
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
S18 S19 S20 S21 S22 S31 S33 S34 S51 15H 1CH
MEASURING METHOD
T30
Halftone Ys Level
B
B
B
A
B
B
B
B
A
00H 80H
T31
Halftone Gain 1
———
T32
Halftone Gain 2
01H
———
T33
Text ON Ys, Low
Level
———
T34
Text / OSD Output,
Low Level
———
(1) Input stepping signal whose amplitude is 0.3V in video period to pin
31 (Y IN) and pin 51 (Sync IN).
(2) Set bus data so that blanking is off and halftone is −3dB in on
status.
(3) Connect power supply to pin 21 (Digital Ys). While impressing 0V
to it, measure amplitude and pedestal level of pin 13 (G OUT) in
video period (Vm13, Vp13).
(4) Raising supply voltage to pin 21 gradually from 0V, measure level
(Vtht1) of pin 21 when amplitude of pin 13 output signal changes.
At the same time, measure amplitude and pedestal level of pin 13
in video period after the pin 13 output signal changed in amplitude.
(Vm13b, Vp13b)
(5) According to results of the above steps 3 and 4, calculate gain of
−3dB halftone and variation of pedestal level.
G3ht13 = 20 og
l
(Vm13b / Vm13)
(6) Set bus data so that halftone is −6dB in on status, and perform the
same measurement as the above steps 4 and 5 to find gain of
−6dB halftone and variation of pedestal level (G6th13).
(7) Raising supply voltage to pin 21 further from Vtht1, measure level
(Vttx1) of pin 21 when output signal of pin 13 (G OUT) changes in
amplitude and DC level of pin 13 after the change of its output
(Vtx13).
(8) From results of the above steps 3 and 7, calculate low level of the
output in the text mode.
Vtxl13 = Vtx13 − Vp13
(9) Raising supply voltage to pin 21 by 3V from that in the above step
7, confirm that there is no change in output level of pin 13.


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