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| 型号： | TVP5154APNPR |
| 厂商： | Texas Instruments |
| 文件页数： | 3/93页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO DECODER 4CH 128-HTQFP |
| 产品培训模块： | Data Converter Basics |
| 标准包装： | 1 |
| 类型： | 视频解码器 |
| 应用： | 安全系统 |
| 电压 - 电源，模拟： | 1.8V |
| 电压 - 电源，数字： | 1.8V，3.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 128-TQFP 裸露焊盘 |
| 供应商设备封装： | 128-HTQFP（14x14） |
| 包装： | 标准包装 |
| 产品目录页面： | 887 (CN2011-ZH PDF) |
| 配用： | TVP5154EVM-ND - TVP5154EVM 296-23058-ND - EVAL MODULE FOR DM642 |
| 其它名称： | 296-23027-6 |
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www.ti.com
SLES214C – DECEMBER 2007 – REVISED SEPTEMBER 2010
3.4
Color Low-Pass Filter
In some applications, it is desirable to limit the Cb/Cr bandwidth to avoid crosstalk. This is especially true
in the case of video signals that have asymmetrical Cb/Cr sidebands. The provided color LP filters limit the
bandwidth of the Cb/Cr signals. Color LP filters are needed when the comb filtering turns off, due to
extreme color transitions in the input image. See Chrominance Control #2 Register (Section 7.2.27), for
the response of these filters. The filters have three options that allow three different frequency responses
based on the color frequency characteristics of the input video as shown in Figure 3-3.
Figure 3-3. Color Low-Pass Filter with Filter Characteristics, NTSC/PAL ITU-R BT.601 Sampling
3.5
Luminance Processing
The luma component is derived from the composite signal by subtracting the remodulated chroma
information. A line delay exists in this path to compensate for the line delay in the adaptive comb filter in
the color processing chain. The luma information is then fed into the peaking circuit, which enhances the
high-frequency components of the signal, thus, improving sharpness.
3.6
Chrominance Processing
For NTSC/PAL formats, the color processing begins with a quadrature demodulator. The Cb/Cr signals
then pass through the gain control stage for chroma saturation adjustment. An adaptive comb filter is
applied to the demodulated signals to separate chrominance and eliminate cross-chrominance artifacts.
An automatic color-killer circuit is also included in this block. The color killer suppresses the chrominance
processing when the burst amplitude falls below a programmable threshold (see I2C subaddress 06h,
Section 7.2.7). The SECAM standard is similar to PAL except for the modulation of color, which is FM
instead of QAM.
3.7
Timing Processor
The timing processor is a combination of hardware and software running in the internal microprocessor
that serves to control horizontal lock to the input sync pulse edge, AGC and offset adjustment in the
analog front end, and vertical sync detection.
Copyright 2007–2010, Texas Instruments Incorporated
Functional Description
11
Product Folder Link(s): TVP5154A
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相关代理商/技术参数 |
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|---|---|
| TVP5154EVM | 功能描述:视频 IC 开发工具 TVP5154 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Boards 类型:YPbPr to RGBHV Converters 工具用于评估:LMH1251 工作电源电压:5 V |
| TVP5154PNP | 功能描述:视频 IC 4Ch Lo Pwr PAL/NTSC/ SECAM Video 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 |
| TVP5154PNP | 制造商:Texas Instruments 功能描述:4-Channel Video Decoder |
| TVP5154PNPG4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4-CHANNEL LOW-POWER PAL/NTSC/SECAM VIDEO DECODER WITH INDEPENDENT SCALERS AND FAST LOCK |
| TVP5154PNPR | 功能描述:视频 IC 4Ch Lo Pwr PAL/NTSC SECAM Video 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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