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AD9889 Scheda tecnica(PDF) 9 Page - Analog Devices |
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AD9889 Scheda tecnica(HTML) 9 Page - Analog Devices |
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9 / 48 page  AD9889 Rev. 0 | Page 9 of 48 DESIGN GUIDE GENERAL DESCRIPTION The AD9889 HDMI transmitter provides a high bandwidth digital content protected (HDCP) digital link between a wide range of digital input formats—both audio and video (see Table 8) and output formats (see Table 9). Video and audio data are captured and prepared for transmission while three separate I2C buses (two of which are masters) are used to program and provide content protection for the data to be transmitted. VIDEO DATA CAPTURE The AD9889 can accept video data from as few as eight pins (YCbCr DDR) representing 8-bit data or as many as 24 pins representing 12-bit data. The AD9889 is capable of detecting all of the 34 video formats defined in the EIA/CEA-861B specification. If video ID (VID) 32, 33, or 34 is present, the user needs to set Register R0x15[0] to 0b1, as these modes have VREF frequencies of 30 Hz or less. The user can read the detected video format at R0x3E[7:2]. Formats outside the EIA/CEA-861B specification can be read in R0x3F[7:5]. Detailed line count differences for 240p and 288p modes can be read from R0x3F[4:3]. In order to distinguish between an aspect ratio of 4:3 and one of 16:9, R0x17[1] should be set accordingly. Table 8. Input Formats Supported No. of Bits Input Format 12 RGB (DDR) 12 YCbCr 4:4:4 (DDR) 24 RGB 4:4:4 24 YCbCr 4:4:4 16 YCbCr 4:2:2 (ITU.601) 20 YCbCr 4:2:2 (ITU.601) 24 YCbCr 4:2:2 (ITU.601) 8 YCbCr (DDR) 10 YCbCr (DDR) 12 YCbCr (DDR) 8 YCbCr 4:2:2 (ITU.656) 10 YCbCr 4:2:2 (ITU.656) 12 YCbCr 4:2:2 (ITU.656) Table 9. Output Formats Supported No. of Bits Output Format 24 RGB 4:4:4 24 YCbCr 4:4:4 16 YCbCr 4:2:2 20 YCbCr 4:2:2 24 YCbCr 4:2:2 INPUT FORMATS tSETUP tSETUP tHOLD tHOLD tHOLD INPUT DATA: D(23:0), DE, SYNCS INPUT CLOCK- RISING EDGE Figure 3. Timing for Data Input |
Codice articolo simile - AD9889_15 |
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Descrizione simile - AD9889_15 |
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