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TB1227CNG Datasheet(PDF) 36 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) 36 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
36
TEST CONDITION
VIDEO SECTION
TEST CONDITION (Unless otherwise specified : H, RGB VCC = 9V ; VDD, Fsc VDD, Y / C VCC = 5V ; Ta = 25±3°C)
SW MODE
SUB-ADDRESS & BUS DATA
NOTE
ITEM
S39
S42
S44
S45
S51
04H 08H 0FH 10H 13H 14H
MEASURING METHOD
Y1
Y Input Pedestal
Clamping Voltage
A
C
B
A
A
20H 04H 80H 00H BAH 03H
(1) Short circuit pin 45 (Y1 IN) in AC coupling.
(2) Input synchronizing signal to pin 51 (SYNC IN).
(3) Measure DC voltage at pin 45, and express the measurement result as VYcIp.
Y2
Chroma Trap
Frequency
A
B
(1) Set the 358 TRAP mode to AUTO by setting the bus data.
(2) Set the bus data so that chroma trap is ON and f0 is 0.
(3) Input TG7 sine wave signal whose frequency is 3.58MHz (NTSC) and video
amplitude is 0.5V to pin 45 (Y1 IN).
(4) While observing waveform at pin 37 (Y1out), find a frequency with minimum
amplitude of the waveform. The obtained frequency shall be expressed as fIr3.
(5) Change the frequency of the signal 1 to 4.43MHz (PAL) and perform the same
measurement as the preceding step 4. The obtained frequency shall be expressed
as fIr4.
Y3
Chroma Trap
Attenuation
(3.58MHz)
Vari-
able
Vari-
able
Vari-
able
(1) Set the 358 TRAP mode to AUTO by setting bus data.
(2) Set the bus data so that Q of chroma trap is 1.5.
(3) Set the bus data so that f0 of chroma trap is 0.
(4) Input TG7 sine wave signal whose frequency is 3.58MHz (NTSC) and video
amplitude is 0.5V to pin 45 (Y1 IN).
(5) While turning on and off the chroma trap by controlling the bus, measure chroma
amplitude (VTon) at pin 37 (Y1out) with the chroma trap being turned on and
measure chroma amplitude (VToff) at pin 37 (Y1out) with the chroma trap being
turned off.
Gtr = 20ℓog (VToff / VTon)
(6) Change f0 of the chroma trap to −100kHz, −50kHz, 0 and +50kHz, and perform the
same measurement as the preceding steps 4 and 5 with the respective f0 settings.
(7) Change Q of the chroma trap t 1, 1.5, 2 and 2.5, and perform the same
measurement as the preceding steps 4 through 6. The maximum Gtr shall be
expressed as Gtr3a.
(8) Set the 358 TRAP mode to the forces 358 mode by setting bus data, and perform
the same measurement as the preceding steps 2 through 7 (Gtr3f).


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