參數(shù)資料
型號(hào)： TB1274BFG
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： 10 X 14 MM, 0.80 MM PITCH, QFP-48
文件頁(yè)數(shù)： 10/37頁(yè)
文件大?。?/td> 839K
代理商： TB1274BFG
TB1274BFG
2005-08-18
18
EXTERNAL INPUT SWs
External inputs are selected by the BUS data and fast SWs. Final outputs from pin 21/22/23 are shown in
Table 6. RGB1-IN interface complies with SCART connector. Therefore it is active, when RGB1-IN is enable
by the BUS data and when YS3(pin 15) is also high. The status of YS3(pin 15) is responded to the Read BUS
data, V15.
Table 6 Outputs from pin 21/22/23
RGB
SELECT
RGB1 ENB
YS3
(RGB1)
YS1
(YCbCR2)
YS2
(RGB2)
Output
L
0
H
Main
(from V-SW)
00
1
H
RGB1
L
0
H
L
YCbCr1
01
1
H
RGB1
L
0
H
L
10
1
H
RGB1
11
－
L
－
H
L
YCbCr2
－
L
－
H
RGB2
RGB SELECT/RGB1 ENB : I2C BUS data, YS1/2/3 : Fast SW
COLOR SYSTEM
Distinguishable color systems are selected
by the write BUS data, COLOR SYSTEM.
The demodulated color system is responded
to the read BUS data, COLOR SYSTEM and
X’TAL.
(Refer
to
BUS
CONTROL
FUNCTION) The system data is also
responded to Comb SYS(pin 45) and
fsc-OUT(pin 46) as Table 7. If distinguishable
color system signal is not received, the
system data is responded with B/W.
Besides, if pin 7 is connected to VCC(more than 3.5V), Forced SECAM mode is active. In this mode, SECAM
system is identified forcibly. It has priority over the BUS selection.
SECAM BELL FILTER
SECAM bell filter characteristics can be changed by the BUS data, BELL/HPF. The group delay near
chroma band is corrected by changing filter characteristic. As a result, S/N looks better. Besides, center
frequency f0 of bell is changed by BELL f0. Indirectly, it is changed by BPF(TOF) f0.
Normal bell
HPF
Boost 2
Normal bell
Boost 1
(a) Boost mode
(b) HPF mode
Fig.2 SECAM bell filter characteristics
Table 7 DC level of pin 45 and 46 on each color system
COLOR SYSTEM
Pin 45
Pin46
M-PAL
Low
4.43PAL,
SECAM,
B/W
High
Low
3.58/4.43NTSC
Low
High
N-PAL
High
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