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參數(shù)資料
| 型號： | TVP5146M1PFP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 顏色信號轉換 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP80 |
| 封裝： | POWERPAD, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 23/104頁 |
| 文件大?。?/td> | 593K |
| 代理商： | TVP5146M1PFP |
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For CbCr components, a saturation (gain) factor is applied to the CbCr inputs in order to map them to the CbCr output
code range and provide saturation control. Similarly, the limit block can limit CbCr outputs to a valid range:
Cb,Crmin = 64 / Cb,Crmax = 960
x
Gain
CbCr
Limit
Figure 217. CbCr Component Gain, Offset, Limit
2.2.5
Color Space Conversion
The formulas for RGB to YCbCr conversion are given as:
Y = 0.299
× R + 0.587 × G + 0.114 × B
Cb = –0.172
× R – 0.339 × G + 0.511 × B + 512
Cr = 0.511
× R – 0.428 × G – 0.083 × B + 512
2.3
Clock Circuits
An internal line-locked PLL generates the system and pixel clocks. A 14.31818-MHz clock is required to drive the PLL.
This can be input to the TVP5146 decoder at the 1.8-V level on terminal 74 (XTAL1), or a crystal of 14.31818-MHz
fundamental resonant frequency can be connected across terminals 74 and 75 (XTAL2). If a parallel resonant circuit
is used as shown in Figure 218, then the external capacitors must have the following relationship:
CL1 = CL2 = 2CL – CSTRAY,
where CSTRAY is the terminal capacitance with respect to ground. Figure 218 shows the reference clock
configurations. The TVP5146 decoder generates the DATACLK signal used for clocking data.
TVP5146
74
XTAL1
14.31818-MHz
Crystal
75
XTAL2
TVP5146
74
XTAL1
75
XTAL2
CL1
CL2
14.31818-MHz
Clock
Figure 218. Reference Clock Configurations
2.4
Real-Time Control (RTC)
Although the TVP5146 decoder is a line-locked system, the color burst information is used to determine accurately
the color subcarrier frequency and phase. This ensures proper operation with nonstandard video signals that do not
follow exactly the required frequency multiple between color subcarrier frequency and video line frequency. The
frequency control word of the internal color subcarrier PLL and the subcarrier reset bit are transmitted via terminal 37
(GLCO) for optional use in an end system (for example, by a video encoder). The frequency control word is a 23-bit
binary number. The instantaneous frequency of the color subcarrier can be calculated from the following equation:
F
PLL
+
F
ctrl
223
F
sclk
where FPLL is the frequency of the subcarrier PLL, Fctrl is the 23-bit PLL frequency control word, and Fsclk is two times
the pixel frequency. Figure 219 shows the detailed timing diagram.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TVP5146M1PFPG4 | 功能描述:IC VIDEO DECODER 10BIT 80TQFP-EP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| TVP5146M1PFPR | 功能描述:視頻 IC 10-Bit Digital Video Decoder RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TVP5146M1PFPRG4 | 功能描述:視頻 IC 10-Bit Digital Video Decoder RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TVP5146M2 | 制造商:Texas Instruments 功能描述:4x10-bit Video Decoder TVP5146M2PFP |
| TVP5146M2IPFP | 功能描述:視頻 IC 10B Hi Qual Sgl-Chip Dig Video Decoder RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
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