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参数资料
| 型号： | TVP5146M2PFP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 颜色信号转换 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP80 |
| 封装： | GREEN, PLASTIC, HTQFP-80 |
| 文件页数： | 17/107页 |
| 文件大小： | 949K |
| 代理商： | TVP5146M2PFP |
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SLES141G
– JULY 2005 – REVISED APRIL 2011
2.1.1
Video Input Switch Control
The TVP5146M2 decoder has four analog channels that accept up to ten video inputs. The user can
configure the internal analog video switches via the I2C interface. The ten analog video inputs can be used
for different input configurations, some of which are:
Up to ten selectable individual composite video inputs, as well as other combinations of YPbPr,
S-Video, and SCART can be supported (see Table 2-12)
The input selection is performed by the input select register at I2C subaddress 00h (see Table 2-12).
2.1.2
Analog Input Clamping
An internal clamping circuit restores the ac-coupled video signal to a fixed dc level. The clamping circuit
provides line-by-line restoration of the video sync level to a fixed dc reference voltage. The selection
between bottom and mid clamp is performed automatically by the TVP5146M2 decoder.
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 them 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
ADCs
All ADCs have a resolution of 11 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 2-2 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
Copyright
2005–2011, Texas Instruments Incorporated
Functional Description
17
Product Folder Link(s): TVP5146M2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TVP5146M2PFP_0708 | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL/SECAM 4X10-Bit Digital Video Decoder With Macrovision Detection, YPbPr/RGB Inputs, 5-Line Comb Filter, and SCART Support |
| TVP5146M2PFPG4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL/SECAM 4X10-Bit Digital Video Decoder With Macrovision Detection, YPbPr/RGB Inputs, 5-Line Comb Filter, and SCART Support |
| TVP5146M2PFPR | 功能描述:视频 IC 10B Hi Qual Sgl-Chip Dig Vid Dec RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| TVP5146M2PFPRG4 | 制造商:Texas Instruments 功能描述: |
| TVP5146PFP | 功能描述:视频 IC 10B High Qual S-Chip Dig Vid Decoder RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
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