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TB1227CNG Datasheet(PDF) 48 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) 48 Page - Toshiba Semiconductor

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TB1227CNG
2004-05-24
48
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
C9
APC Lead-In
Range
OFF
ON
A
B
B
B
A
A
C
A
A
B
(1) Connect band pass filter (Q = 2), set to TV mode (fo = 600kHz) with X’tal clock
conforming to European, Asian system.
(2) Set the gate to normal status.
(3) Input 3N CW signal of 100mVp-p to pin 42 of the chroma input terminal.
(4) While changing frequency of the CW (continuous waveform) signal, measure its
frequency when B-Y color difference signal of pin 36 is colored.
(5) Input 4N CW (continuous waveform) 100mVp-p signal to pin 42 (Chroma IN).
(6) While changing frequency of the CW signal, measure frequencies when B-Y color
difference output of pin 36 is colored and discolored. Find difference between the
measured frequency and fc (4.433619MHz) and express the differences as fPH and
fPL, which show the APC lead-in range.
(7) Variable frequency of VCXO is used to cope with lead-in of 3.582MHz / 3.575MHz PAL
system.
(8) Activate the test mode (S26-ON, Sub Add 02 ; 02h).
(9) Input nothing to pin 42 (Chroma IN).
(10) While varying voltage of pin 30 (APC Filter), measure variable frequency of VCXO at pin
35 (R-Y OUT) while observing color and discoloring of R-Y color difference signal.
Express difference between the high frequency (fH) and fo center as 3.582HH, and
difference between the low frequency (fL) and fo center as 3.582HL. Perform the same
measurement for the NP system (3.575MHz PAL).
C10
APC Control
Sensitivity
ON
C
(1) Activate the test mode (S26-ON, Sub Add 02 ; 02h).
(2) Connect band pass filter as same as the Note C9.
(3) Change the X’tal mode properly to the system.
(4) Input nothing to pin 42 (Chroma IN).
(5) When V30’s APC voltage ±50mV is impressed to pin 30 (APC Filter) while its voltage is
being varied, measure frequency change of pin 35 output signal as frH or frL and
calculate sensitivity according to the following equation.
b = (frH − frL) / 100


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