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LMH1251 bảng dữ liệu(PDF) 8 Page - Texas Instruments |
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LMH1251 bảng dữ liệu(HTML) 8 Page - Texas Instruments |
8 / 19 page LMH1251 SNLS193J – AUGUST 2005 – REVISED MARCH 2013 www.ti.com APPLICATION INFORMATION GENERAL INFORMATION The LMH1251 is a high speed triple 2:1 video multiplexer with an integrated sync processor and color space converter. One input channel accepts standard RGBHV PC graphics video and the second input channel accepts YPBPR component video. If the first input of the MUX is selected, the device will output the RGBHV video from the input with unity gain. If the second input of the MUX is selected, sync processing and color space conversion will be performed on the YPBPR component signals to provide an equivalent RGBHV signal at the output. YPBPR to RGBHV PROCESSING The LMH1251 is capable of processing 480i, 480p, 576i, 576p, 720p, 1080i, and 1080p YPBPR component video signals only. S-Video, composite NTSC, or composite PAL video will not be converted by the LMH1251. For High Definition, 720p and 1080i/1080p video, the LMH1251 will convert the luma and chroma signals into primary RGB signals according to the linear arithmetic formula specified in the EIA/CEA-770.3-C Standard for High Definition Analog Component TV. For Standard Definition video, the LMH1251 will perform the conversion according to the linear arithmetic formula specified in the EIA/CEA-770.2-C Standard for Standard Definition Analog Component TV. The advanced analog architecture that is employed to perform the color space conversion is precise to within 2.5% of amplitude and 1.5° of phase error on a vectorscope with a color bar test signal. This is illustrated with a vectorscope plot of a converted color bar signal in the 720p format shown Typical Performance Characteristics. Note that although 480i/576i component video is supported by the LMH1251, most PC display monitors cannot handle such line rates. Typically, only 480p, 576p, 720p, and 1080i/1080p are within the displayable line rate range of LCD and CRT monitors. Furthermore, the scaler in LCD monitor systems must include a de-interlacer for it to display interlaced video such as with 1080i. Component Video Formats Supported By The LMH1251 • 480i* • 480p • 576i* • 576p • 720p • 1080i at 25, 29.97, and 30 Hz frame rate • 1080p at 25, 29.97, and 30 Hz frame rate NOTE *These formats with Macrovision are not supported. See MACROVISION COMPATIBILITY for more information. AUTO/MANUAL FORMAT DETECTION The LMH1251 can either automatically detect the input format of the component video source, or it can be put in a manual mode where the MCU has the flexibility to specify which YPBPR to RGBHV processing scheme for the device to apply depending on the input format. If a logic high is applied to Pin 23, the LMH1251 will be in the AUTO detection mode, which is typically recommended. In this mode, the device will appropriately use the proper YPBPR to RGB processing scheme based on its input format detection. If a logic low is applied to Pin 23, the LMH1251 will be in the manual detection mode. In this mode, the MCU must apply a logic low to Pin 22 if the processing scheme is for SDTV video formats, and a logic high if the processing scheme is for HDTV formats. Note that in the AUTO mode, Pin 22 becomes an output pin, and outputs a logic low if an SD video input is detected and a logic high if an HD video input is detected, as notification to the MCU. 8 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LMH1251 |
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Mô tả tương tự - LMH1251 |
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