參數(shù)資料
型號： TVP5154AIPNPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 顏色信號轉(zhuǎn)換
英文描述： COLOR SIGNAL DECODER, PQFP128
封裝： PLASTIC, HTQFP-128
文件頁數(shù)： 89/92頁
文件大?。?/td> 1089K
代理商： TVP5154AIPNPR
www.ti.com
SLES214C – DECEMBER 2007 – REVISED SEPTEMBER 2010
3
Functional Description
3.1
Analog Front End
Each channel of the TVP5154A decoder has an analog input channel that accepts two video inputs, which
should be ac coupled through 0.1-F capacitors. The decoder supports a maximum input voltage range of
0.75 V; therefore, an attenuation of one-half is needed for standard input signals with a peak-to-peak
variation of 1.5 V. The maximum parallel termination before the input to the device is 75
. See the
schematic in Section 10 for recommended configuration. The two analog input ports can be connected as
follows:
Two selectable composite video inputs or
One S-video input
An internal clamping circuit restores the ac-coupled video signal to a fixed dc level.
The programmable gain amplifier (PGA) and the automatic gain control (AGC) circuit work together to
ensure that the input signal is amplified or attenuated correctly, ensuring the proper input range for the
ADC.
When switching CVBS inputs from one input to the other, the AGC settings are internally stored and the
previous settings for the new input are restored. This eliminates flashes and dark frames associated with
switching between inputs that have different signal amplitudes.
The ADC has nine bits of resolution and runs at a maximum speed of 27 MHz. The clock input for the
ADC comes from the PLL.
3.2
Composite Processing Block Diagram
The composite processing block processes NTSC/PAL/SECAM signals into the YCbCr color space.
Figure 2-1 shows the basic architecture of this processing block.
Figure 2-1 shows the luminance/chrominance (Y/C) separation process in the TVP5154A decoders. The
composite video is multiplied by sub-carrier signals in the quadrature modulator to generate the color
difference signals Cb and Cr. Cb and Cr are then low pass (LP) filtered to achieve the desired bandwidth
and to reduce crosstalk.
An adaptive 4-line comb filter separates CbCr from Y. Chroma is remodulated through another quadrature
modulator and subtracted from the line-delayed composite video to generate luma. Contrast, brightness,
hue, saturation, and sharpness (using the peaking filter) are programmable via I2C.
The Y/C separation is bypassed for S-video input. For S-video, the remodulation path is disabled.
Copyright 2007–2010, Texas Instruments Incorporated
Functional Description
9
Product Folder Link(s): TVP5154A
相關(guān)PDF資料
PDF描述
TVP5154AIPNP COLOR SIGNAL DECODER, PQFP128
TVP5154APNPR COLOR SIGNAL DECODER, PQFP128
TVP5154APNP COLOR SIGNAL DECODER, PQFP128
TVP5154PNPG4 COLOR SIGNAL DECODER, PQFP128
TVP5154PNPRG4 COLOR SIGNAL DECODER, PQFP128
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TVP5154APNP 功能描述:視頻 IC 4Ch Lo Pwr PAL/NTSC SECAM Vid Dec 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
TVP5154APNPR 功能描述:視頻 IC 4Ch Lo Pwr PAL/NTSC SECAM Vid Dec 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
TVP5154EVM 功能描述:視頻 IC 開發(fā)工具 TVP5154 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Boards 類型:YPbPr to RGBHV Converters 工具用于評估:LMH1251 工作電源電壓:5 V
TVP5154PNP 功能描述:視頻 IC 4Ch Lo Pwr PAL/NTSC/ SECAM 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
TVP5154PNP 制造商:Texas Instruments 功能描述:4-Channel Video Decoder
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