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参数资料
| 型号： | TVP5031PFP |
| 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： | POWER, PLASTIC, TQFP-80 |
| 文件页数： | 10/92页 |
| 文件大小： | 415K |
| 代理商： | TVP5031PFP |
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2–2
2.1.2
Analog Input Clamping and Automatic Gain Control Circuits
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. Two modes of clamping are provided,
coarse and fine. In coarse mode, the most negative portion of the input signal (typically the sync tip) is clamped to
a fixed dc level. Fine clamp mode may be enabled to prevent spurious level shifting caused by noise more negative
than the sync tip on the input signal. If fine clamp mode is selected, clamping is only enabled during the sync period.
S-video requires fine clamp mode on the chroma channel for proper operation. External capacitors of 0.1
F on
terminal CLAMP1 and CLAMP2 are required to store and filter the clamp voltage.
Input video signal amplitude may vary significantly from the nominal level of 1Vpp. An automatic gain control circuit
(AGC) adjusts the signal amplitude to utilize the maximum range of the A/D converter without clipping. The AGC
adjusts gain to achieve desired sync amplitude. Some nonstandard video signals contain peak white levels that
saturate the A/D converter. In these cases, AGC automatically cuts back gain to avoid clipping.
In the digital data path, scaling is applied to the A/D output data to reach CCIR601 Y, Cr, Cb levels. This scaling
introduces distortion if digitized sync tip and back porch levels are not precise. The fine gain and offset adjustment
block precisely controls the sync tip and back porch levels to achieve best linearity performance.
2.1.3
A/D Converter
The TVP5031 contains one 9-bit oversampling A/D converter that digitizes the analog video inputs. As the input is
digitized at greater than two times the Nyquist sampling rate, only a simple external antialiasing low pass filter is
needed to prevent out-of-band frequencies. A/D converter reference voltages on terminals REFP and REFM require
an external capacitor network for filtering, as shown in Figure 2–1.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TVP5031TQFP | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL VIDEO DECODER |
| TVP5040 | 制造商:TI 制造商全称:Texas Instruments 功能描述:NTSC/PAL Digital Video Decoder With Macrovision Detection |
| TVP5040CPFP | 功能描述:IC NTSC/PAL VIDEO DECODER 80TQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 编码器，解码器，转换器 系列:- 产品变化通告:Development Systems Discontinuation 26/Apr/2011 标准包装:1 系列:- 类型:编码器 应用:DVB-S.2 系统 电压 - 电源，模拟:- 电压 - 电源，数字:- 安装类型:- 封装/外壳:模块 供应商设备封装:模块 包装:散装 其它名称:Q4645799 |
| TVP5040CPFPG4 | 功能描述:IC NTSC/PAL VIDEO DECODER 80TQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 编码器，解码器，转换器 系列:- 产品变化通告:Development Systems Discontinuation 26/Apr/2011 标准包装:1 系列:- 类型:编码器 应用:DVB-S.2 系统 电压 - 电源，模拟:- 电压 - 电源，数字:- 安装类型:- 封装/外壳:模块 供应商设备封装:模块 包装:散装 其它名称:Q4645799 |
| TVP5040EVM | 制造商:Texas Instruments 功能描述:EVAL BD TVP5040EVM USER S GUIDE - Bulk |
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