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參數(shù)資料
| 型號： | TW9903 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | TW9903 ? Multi-standard Video Decoder With High Quality Down Scaler |
| 中文描述： | TW9903？多標(biāo)準(zhǔn)視頻解碼器，高品質(zhì)下倍線器 |
| 文件頁數(shù)： | 6/74頁 |
| 文件大?。?/td> | 630K |
| 代理商： | TW9903 |
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TW9903
TECHWELL, INC.
6
REV. 0.92 ( B )
06/02/2002
Software selectable analog inputs allow several possible input combinations:
1. Up to four composite video inputs. 2. Three composite, one S-video.
The input video signals in any certain channel maybe momentarily connected together through the
equivalent of a 200 ohm resistor during multiplexer switching. Therefore, the multiplexer cannot be
used for switching on a real-time pixel-by-pixel basis.
Clamping and Automatic Gain Control
All three analog channels have built-in clamping circuit that restore the signal DC level. The Y
channel restores the back porch of the digitized video to a level of 64 or a programmable level. The
C_Pb channel restores the back porch of the digitized video to a level of 128. This operation is
automatic through internal feedback loop.
The Automatic Gain Control (AGC) of the Y channel adjusts input gain so that the sync tip is at a
desired level. A programmable white peak protection logic is included to prevent saturation in the
case of abnormal proportion between sync and white peak level.
Analog to Digital Converter
TW9903 contains three 8bit pipelined ADCs that consume less power than conventional flash
ADC. The output of the Clamp and AGC connects to one ADC that digitizes the composite input or
the Y signal of the S-Video input. The second ADC digitizes the C signal when decoding S-video
signal.
Sync Processing
The sync processor of TW9903 detects horizontal synchronization and vertical synchronization
signals in the composite video or in the Y signal of an S-video or component signal. The processor
contains a digital phase-locked-loop and decision logic to achieve reliable sync detection in stable
signal as well as in unstable signals such as those from VCR fast forward or backward.
Horizontal sync processing
The horizontal synchronization processing contains a sync separator, a phase-ocked-loop (PLL),
and the related decision logic.
The horizontal sync detector detects the presence of a horizontal sync tip by examining low-pass
filtered input samples whose level is lower than a threshold. After sufficient low levels are detected,
a horizontal sync is recognized. Additional logic is also used to avoid false detection on glitches.
The horizontal PLL locks onto the extracted horizontal sync in all conditions to provide jitter free
image output. From there, the PLL also provides orthogonal sampling raster for the down stream
processor. The PLL has free running frequency that matches the standard raster frequency. It also
has wide lock-in range for tracking any non-standard video signal.
In case the horizontal sync is missing, a “free-wheel” mechanism keeps generating horizontal sync
signal until horizontal sync is detected again. This option can also be turned off for some
applications that determine video loss by detecting the existence of horizontal sync.
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參數(shù)描述 |
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| TW9903-FB | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別: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:Q4645799 |
| TW9903-MB | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別: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:Q4645799 |
| TW9903-MBS | 功能描述:IC NTSC/PAL/SECAM DECODR 100PQFP RoHS:是 類別: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:Q4645799 |
| TW9905-FD | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別: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:Q4645799 |
| TW9905-MD | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM RoHS:是 類別: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:Q4645799 |
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