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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.

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
TVP5031TQFP	制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:NTSC/PAL VIDEO DECODER
TVP5040	制造商:TI 制造商全稱(chēng):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:是類(lèi)別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:編碼器應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類(lèi)型:- 封裝/外殼:模塊供應(yīng)商設(shè)備封裝:模塊包裝:散裝其它名稱(chēng):Q4645799
TVP5040CPFPG4	功能描述:IC NTSC/PAL VIDEO DECODER 80TQFP RoHS:是類(lèi)別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:編碼器應(yīng)用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類(lèi)型:- 封裝/外殼:模塊供應(yīng)商設(shè)備封裝:模塊包裝:散裝其它名稱(chēng):Q4645799
TVP5040EVM	制造商:Texas Instruments 功能描述:EVAL BD TVP5040EVM USER S GUIDE - Bulk

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