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參數資料
| 型號： | TVP5146M2PFPRG4 |
| 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： | GREEN, PLASTIC, HTQFP-80 |
| 文件頁數： | 18/107頁 |
| 文件大小： | 1427K |
| 代理商： | TVP5146M2PFPRG4 |
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Functional Description
10
SLES141B—August 2007
TVP5146M2PFP
2.1.3 Automatic Gain Control
The TVP5146M2 decoder uses four programmable gain amplifiers (PGAs), one per channel. The PGA can
scale a signal with a voltage-input compliance of 0.5-VPP to 2-VPP to a full-scale 10-bit A/D output code range.
A 4-bit code sets the coarse gain with individual adjustment per channel. Minimum gain corresponds to a code
0x0 (2-VPP full-scale input, –6-dB gain) while maximum gain corresponds to code 0xF (0.5 VPP full scale,
+6-dB gain). The TVP5146M2 decoder also has 12-bit fine gain controls for each channel and applies
independently to coarse gain controls. For composite video, the input video signal amplitude can vary
significantly from the nominal level of 1 VPP. The TVP5146M2 decoder can adjust its PGA setting
automatically: an AGC can be enabled and can adjust the signal amplitude such that the maximum range of
the ADC is reached without clipping. Some nonstandard video signals contain peak white levels that saturate
the ADC. In these cases, the AGC automatically cuts back gain to avoid clipping. If the AGC is on, then the
TVP5146M2 decoder can read the gain currently being used.
The TVP5146M2 AGC comprises the front-end AGC before Y/C separation and the back-end AGC after Y/C
separation. The back-end AGC restores the optimum system gain whenever an amplitude reference such as
the composite peak (which is only relevant before Y/C separation) forces the front-end AGC to set the gain
too low. The front-end and back-end AGC algorithms can use up to four amplitude references: sync height,
color burst amplitude, composite peak, and luma peak.
The specific amplitude references being used by the front-end and back-end AGC algorithms can be
independently controlled using the AGC white peak processing register located at subaddress 74h. The
TVP5146M2 gain increment speed and gain increment delay can be controlled using the AGC increment
speed register located at subaddress 78h and the AGC increment delay register located at subaddress 79h,
respectively.
2.1.4 A/D Converters
All ADCs have a resolution of 10 bits and can operate up to 30 MSPS. All A/D channels receive an identical
clock from the on-chip phase-locked loop (PLL) at a frequency between 24 MHz and 30 MHz. All ADC
reference voltages are generated internally.
2.2
Digital Video Processing
Figure 22 is a block diagram of the TVP5146M2 digital video decoder processor. This processor receives
digitized video signals from the ADCs and performs composite processing for CVBS and S-video inputs,
YCbCr signal enhancements for CVBS and S-video inputs, and YPbPr/RGB processing for component video
inputs. It also generates horizontal and vertical syncs and other output control signals such as genlock for
CVBS and S-video inputs. Additionally, it can provide field identification, horizontal and vertical lock, vertical
blanking, and active video window indication signals. The digital data output can be programmed to two
formats: 20-bit 4:2:2 with external syncs or 10-bit 4:2:2 with embedded/separate syncs. The circuit detects
pseudosync pulses, AGC pulses, and color striping in Macrovision-encoded copy-protected material.
Information present in the VBI interval can be retrieved and either inserted in the ITU-R BT.656 output as
ancillary data or stored in internal FIFO and/or registers for retrieval via the host port interface.
相關PDF資料 |
PDF描述 |
|---|---|
| TVP5146M2PFPG4 | COLOR SIGNAL DECODER, PQFP80 |
| TVP5146PFPRG4 | COLOR SIGNAL DECODER, PQFP80 |
| TVP5146PFP | COLOR SIGNAL DECODER, PQFP80 |
| TVP5146PFPR | COLOR SIGNAL DECODER, PQFP80 |
| TVP5146PFPG4 | COLOR SIGNAL DECODER, PQFP80 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TVP5146PFP | 功能描述:視頻 IC 10B High Qual S-Chip Dig Vid 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 |
| TVP5146PFP | 制造商:Texas Instruments 功能描述:IC VIDEO DECODER 10BIT 30MSPS HTQFP-80 制造商:Texas Instruments 功能描述:IC, VIDEO DECODER, 10BIT 30MSPS HTQFP-80 |
| TVP5146PFPG4 | 制造商:Texas Instruments 功能描述:10BIT VIDEO DECODER SMD HTQFP80 |
| TVP5146PFPR | 功能描述:視頻 IC NTSC/PAL/SECAM 4x10B Dig Vid Dec 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 |
| TVP5147EVM | 功能描述:視頻 IC 開發工具 TVP5147 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Boards 類型:YPbPr to RGBHV Converters 工具用于評估:LMH1251 工作電源電壓:5 V |
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