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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 70/74頁(yè) |
| 文件大?。?/td> | 630K |
| 代理商： | TW9903 |
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TW9903
TECHWELL, INC.
70
REV. 0.92 ( B )
06/02/2002
Application Information
Video Input Interface
The TW9903 has a built-in 4:1 input MUX for software controllable input selections. This MUX can
be used to select three composite video sources and one S-Video source or two composite video
sources, one S-video and one component video source. The output of the MUX (MUXOUT) should
be connected to YIN directly or through a 0.1uF capacitor. The chroma of the S-Video input should
be connected to C_PBIN0 or C_PBIN1 of the C-Channel A/D converter. For a typical application, a
video input should be first terminated with a 75 ohm resistor before it is AC coupled by a 0.1uF
capacitor to the input of the MUX.
A/D Converter
The TW9903 has three internal A/D converters to cover all possible analog video signal sources.
The reference supply generator for the A/D converter is also on-chip. For a better noise immunity,
VREFP, VREFN, VCOM and VQVD should be connected through a 0.1uF capacitor to AGND.
Clamping/AGC
The TW9903 has built-in automatic clamping control circuitry. No extra external component is
needed for this operation. The clamping loop gain can be controlled through register setting. The
TW9903 also has built-in automatic AGC control circuitry. The AGC loop gain can also be
controlled by register. The AGC loop response time is also register programmable.
Clock Generation
The TW9903 requires one 27MHz crystal connected to XTI and XTO for all format decoding. The
default crystal type should be 27MHz, fundamental mode, 20pF load capacitance or less, +
50ppm, and with series resistance of 80 ohm or less. An external clock source of 27MHz can also
be connected to the XTI input in place of the crystal. For True Square Pixel mode applications, a
24.54MHz crystal for 60Hz field rate source and a 29.5MHz crystal for 50Hz field rate source
should be used. In this case, the bit FC27 of registers 0x02 should be set to '0' for proper operation.
A typical 27MHz third overtone crystal circuit is shown in the following figure. In the case of using
27MHz fundamental mode crystal, the C1 and L1 can be omitted.
Power-Up
After power-up, the TW9903 registers have unknown values. The RST# pin must be asserted and
released to bring all registers to its default values. After reset, the TW9903 data outputs are tri-
stated. The OPFORM register should be written after reset to enable outputs desired.
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| TW9903-FB | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM 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 |
| TW9903-MB | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM 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 |
| TW9903-MBS | 功能描述:IC NTSC/PAL/SECAM DECODR 100PQFP 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 |
| TW9905-FD | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM 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 |
| TW9905-MD | 功能描述:IC DECODER VIDEO NTSC/PAL/SECAM 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 |
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