參數資料
型號： TVP5020CPFP
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： POWERPAD, PLASTIC, HTQFP-80
文件頁數： 7/87頁
文件大?。?/td> 394K
代理商： TVP5020CPFP
2–1
2 Detailed Description
2.1
Analog Video Processors and A/D Converter
Figure 2–1 is a functional diagram of the TVP5020 analog video processors and A/D converter. This block
accepts up to two inputs and performs analog signal conditioning (i.e., video clamping, video amplifying),
and carries out analog-to-digital conversion.
2.1.1
Video Input Selection
Two high-impedance video inputs are sources for a single internal analog channel in the TVP5020. The user
can connect the two analog video inputs to two selectable individual composite video inputs.
2.1.2
Analog Input Clamping and Automatic Gain Control Circuits
The internal clamp circuit restores the ac-coupled video signals to a fixed dc level before A/D conversion.
The clamping circuit provides line-by-line restoration of the video sync level to a fixed dc reference voltage.
The circuit has two modes of clamping, coarse and fine. In coarse mode, the most negative portion of the
signal (typically the sync tip) is clamped to a fixed dc level. The circuit uses fine mode to prevent spurious
level shifting caused by noise that is more negative than the sync tip on the input signal. When fine mode
is enabled, after the sync position is detected, clamping is only enabled during the sync period.
Input video signal amplitudes may vary significantly from the nominal level of 1 Vpp. An automatic gain
control (AGC) circuit adjusts the signal amplitude to use the maximum range of the A/D converter without
clipping.
The AGC circuit adjusts the signal amplitude based on the detected amplitude of the sync portion of the input
signal. Signal peaks may be present on nonstandard signals that cause clipping at the A/D converter after
gain adjustment based only on sync amplitude. In these cases, the signal will be attenuated before A/D
conversion.
Clamp
Clamp and AGC
Control Logic
Sync Processor
Amplifier
Input Multiplexer
A/D
VI_1A
VI_1B
Analog Input Video
Digitized Video
Channel 1 (0–7)
Figure 2–1. Analog Video Processors and A/D Converters
2.1.3
A/D Converter
The TVP5020 contains one 8-bit A/D converter which digitizes the selected analog video signal input. To
prevent high frequencies which are above half of the sampling rate from entering into the system, video
inputs may require external anti-aliasing low pass filters.
2.2
Digital Processing
Figure 2–2 is a block diagram of the TVP5020 digital video processing. This block receives digitized
composite or signals from the A/D converter, and performs Y/C separation, chroma demodulation, and
Y-signal enhancements. It also generates the horizontal and vertical syncs. The YUV digital output may be
programmed into various formats: 16-bit or 8-bit 4:2:2, 12-bit 4:1:1 and ITU-R BT.656 parallel interface
standard. The circuit uses comb filters to reduce the cross-chroma and cross-luma noise.
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PDF描述
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相關代理商/技術參數
參數描述
TVP5020PFC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
TVP5020TQFP 制造商:TI 制造商全稱:Texas Instruments 功能描述:NTSC/PAL VIDEO DECODER
TVP5021PFP 功能描述:視頻 IC NTSC/PAL DIGITAL VIDEO 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
TVP5021PFPG4 功能描述:視頻 IC NTSC/PAL DIGITAL VIDEO 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
TVP5031 制造商:TI 制造商全稱:Texas Instruments 功能描述:NTSC/PAL VIDEO DECODER
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