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參數(shù)資料
型號: TVP5147PFPRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 顏色信號轉(zhuǎn)換
英文描述: COLOR SIGNAL DECODER, PQFP80
封裝: GREEN, PLASTIC, HTQFP-80
文件頁數(shù): 17/100頁
文件大小: 1465K
代理商: TVP5147PFPRG4
Functional Description
16
SLES099C—March 2007
TVP5147PFP
f Frequency MHz
1
0
1
2
3
4
5
6
7
01234567
Gain = 0
Gain = 2
Peak at
f = 2.89 MHz
Gain = 0.5
Gain = 1
Amplitude
dB
Figure 215. Peaking Filter Response, PAL Square Pixel Sampling
2.2.3.1
Color Transient Improvement
Color transient improvement (CTI) enhances horizontal color transients. The color difference signal transition
points are maintained, but the edges are enhanced for signals which have bandwidth-limited color
components.
2.3
Clock Circuits
An internal line-locked PLL generates the system and pixel clocks. A 14.318-MHz clock is required to drive
the PLL. This can be input to the TVP5147 decoder at the 1.8-V level on terminal 74 (XTAL1), or a crystal of
14.318-MHz fundamental resonant frequency can be connected across terminals 74 and 75 (XTAL2). If a
parallel resonant circuit is used as shown in Figure 216, then the external capacitors must have the following
relationship:
CL1 = CL2 = 2CL CSTRAY,
where CSTRAY is the terminal capacitance with respect to ground. Figure 216 shows the reference clock
configurations. The TVP5147 decoder generates the DATACLK signal used for clocking data.
TVP5147
74
XTAL1
14.318-MHz
Crystal
75
XTAL2
TVP5147
74
XTAL1
75
XTAL2
CL1
CL2
14.318-MHz
Clock
Figure 216. Reference Clock Configurations
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