參數(shù)資料
型號(hào)： TB1245N
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDIP56
封裝： PLASTIC, SDIP-56
文件頁(yè)數(shù)： 49/101頁(yè)
文件大小： 1490K
代理商： TB1245N
TB1245N
2001-07-26
51
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
A
↓
C
A
B
(1) Connect band pass filter (Q = 2), set to TV mode (fo = 600 kHz) with X’tal clock
conforming to European, Asian system.
(2) Set the gate to normal status.
(3) Input 3N CW signal of 100 mVp-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) 100 mVp-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 (4.433619 MHz) 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 3.582 MHz / 3.575 MHz 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 (3.575 MHz 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 ±50 mV 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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