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AD9389/PCB Datasheet(PDF) 17 Page - Analog Devices |
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AD9389/PCB Datasheet(HTML) 17 Page - Analog Devices |
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17 / 48 page  AD9389 Rev. 0 | Page 17 of 48 N PARAMETER N shall be an integer number that meets the following restriction: 128 × fS/1500 Hz ≤ N ≤ 128 × fS/300 Hz with a recommended optimal value of 128 × fS/1000 Hz equals N. For coherent audio and video clock sources, use Table 18 to Table 20 to determine the value of N. For noncoherent sources or sources where coherency is not known, use the equations previously described. CTS PARAMETER CTS is an integer number that satisfies the following: (Average CTS Value) = (fTMDS_clock × N)/(128 × fS) Recommended N and Expected CTS Values The recommended value of N for several standard pixel clocks is given in Table 18 to Table 20. It is recommended that sources with noncoherent clocks use the values listed for the pixel clock type labeled Other. Table 18. Recommended N and Expected CTS Values for 32 kHz Audio 32 kHz Pixel Clock (MHz) N CTS 25.1/1.001 4576 28125 25.2 4096 25200 27 4096 27000 27 × 1.001 4096 27027 54 4096 54000 54 × 1.001 4096 54054 74.25/1.001 11648 210937 to 2109381 74.25 4096 74250 148.5/1.001 11648 421875 148.5 4096 148500 Other 4096 Measured 1 This value alternates because of the restriction on N. Table 19. Recommended N and Expected CTS Values for 44.1 kHz Audio and Multiples 44.1 kHz 88.2 kHz 176.4 kHz Pixel Clock (MHz) N CTS N CTS N CTS 25.1/1.001 7007 31250 14014 31250 28028 31250 25.2 6272 28000 12544 28000 25088 28000 27 6272 3000 12544 30000 25088 30000 27 × 1.001 6272 30030 12544 30030 25088 30030 54 6272 60000 12544 60000 25088 60000 54 × 1.001 6272 60060 12544 60060 25088 60060 74.25/1.001 17836 234375 35672 234375 71344 234375 74.25 6272 82500 12544 82500 25088 82500 148.5/1.001 8918 234975 17836 234375 35672 123375 148.5 6272 165000 12544 16500 25088 162000 Other 6272 Measured 15244 Measured 25088 Measured Table 20. Recommended N and Expected CTS Values for 48 kHz Audio and Multiples 44.1 kHz 88.2 kHz 176.4 kHz Pixel Clock (MHz) N CTS N CTS N CTS 25.1/1.001 6864 28125 13728 28125 27456 28125 25.2 6144 25200 12288 25200 24576 25200 27 6144 27000 12288 27027 24576 27027 27 × 1.001 6144 27027 12288 27027 24576 27027 54 6144 54000 12288 54000 24576 54000 54 × 1.001 6144 54054 12288 54054 24576 74250 74.25/1.001 11648 140625 23296 140625 46592 140625 74.25 6144 74250 12288 74250 24576 74250 148.5/1.001 5824 140625 11648 140625 23296 140625 148.5 6144 148500 12288 148500 24576 148500 Other 6144 Measured 12288 Measured 24576 Measured |
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