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TB1227CNG Datasheet(PDF) 47 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) 47 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
47
TEST CONDITION (Unless otherwise specified : H, RGB VCC = 9V ; VDD, Fsc VDD, Y / C VCC = 5V ; Ta = 25±3°C)
SW MODE
NOTE
ITEM
S26
S1
S31
S33
S34
S39
S42
S44
S45
S51
MEASURING METHOD
(1) Activate the test mode (S26-ON, Sub Add 02 ; 08h).
(2) Connect band pass filter (Q = 2), set crystal mode to conform to European, Asian
system and set the gate to normal status.
(3) Input 3N rainbow color bar signal (100mVp-p) to pin 42 (Chroma IN).
(4) Measure phase shift of B-Y color difference output of pin 36.
(5) While shifting color phase (tint) from minimum to maximum by the bus control, measure
phase change of B-Y color difference output of pin 36. On the condition that 6 bars in
the center have the peak level (regarded as center of color phase), the side of 5 bars is
regarded as positive direction while the side of 7 bars is regarded as negative direction
C6
Tint Control
Sharing Range
(fo = 600kHz)
ON
A
B
B
B
A
A
A
A
B
when the 5 bars or the 7 bars are in the peak level.
Based on this assumption,open angle toward the
positive direction is expressed as ∆θ1 and that
toward the negative direction is expressed as ∆θ2 as
viewed from the phase center. ∆θ1 and ∆θ2 show
the tint control sharing range.
(6) Variable range is expressed by sum of ∆θ1 sharing
range and ∆θ2 sharing range.
∆θT = ∆θ1+∆θ2
C7
Tint Control
Variable Range
(fo = 600kHz)
(7) While shifting color phase from minimum to maximum with the bus control, measure
phase shift of B-Y color difference output of pin 36. When center 6 bars have peak level,
value of color phase bus step is expressed as θTin.
(8) While shifting color phase from minimum to maximum with the bus control, measure
values of color phase bus step corresponding to 10% and 90% of absolutely variable
phase shift of B-Y color difference output of pin36.
The range of color phase shifted by the bus control is
expressed as While shifting color phase from
minimum to maximum with the bus control, measure
phase shift of B-Y color difference output of pin 36.
When center 6 bars have peak level, value of color
phase bus step is expressed as ∆Tin (conforming to
TV mode, fo = 600kHz).
C8
Tint Control
Characteristic
(9) Input 4N rainbow color bar signal to pin 42 (Chroma IN), and perform the same
measurement as the 3N signal.


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