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AD9142ABCPZ 数据表(PDF) 26 Page - Analog Devices |
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AD9142ABCPZ 数据表(HTML) 26 Page - Analog Devices |
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26 / 73 page  Data Sheet AD9142A Table 14. DLL Phase Setup and Hold Times (Typical) Frequency, fDCI1 (MHz) Time (ps) Data Port Setup and Hold Times (ps) at DLL Phase −6 −5 −4 −3 −2 −1 0 +1 +2 +3 +4 +5 +6 250 tS −93 −196 −312 −416 −530 −658 −770 −878 −983 −1093 −1193 −1289 −1412 tH 468 579 707 825 947 1067 1188 1315 1442 1570 1697 1777 1876 275 tS −87 −172 −264 −364 −464 −556 −653 −756 −859 −956 −1053 −1151 −1251 tH 451 537 646 757 878 977 1092 1218 1311 1423 1537 1653 1728 300 tS −82 −166 −256 −341 −426 −515 −622 −715 −809 −900 −1001 −1097 −1184 tH 422 500 598 703 803 897 1000 1105 1203 1303 1411 1522 1612 325 tS −46 −114 −190 −271 −358 −447 −538 −612 −706 −806 −891 −966 −1044 tH 405 483 563 647 740 832 914 1000 1100 1200 1292 1380 1476 350 tS −23 −92 −180 −252 −328 −409 −491 −574 −654 −731 −819 −889 −959 tH 383 451 524 607 682 762 844 930 1011 1097 1186 1277 1358 375 tS −7 −82 −150 −225 −315 −391 −461 −526 −595 −661 −726 −786 −853 tH 401 466 504 569 641 718 783 863 941 1025 1106 1187 1264 400 tS −46 −98 −161 −243 −303 −384 −448 −513 −578 −643 −713 −771 −833 tH 385 445 503 546 604 674 748 826 890 965 1039 1110 1178 425 tS 4 −52 −110 −170 −229 −297 −394 −449 −517 −579 −641 −704 −752 tH 358 408 465 524 595 625 692 762 829 900 966 1032 1097 450 tS 11 −34 −92 −147 −209 −269 −324 −386 −446 −509 −564 −622 −672 tH 354 406 457 516 573 637 693 731 792 852 917 983 1042 475 tS −15 −51 −95 −147 −198 −255 −313 −366 −425 −480 −530 −585 −640 tH 355 399 451 499 556 613 675 727 779 815 873 930 988 500 tS 9 −28 −77 −128 −183 −233 −288 −333 −390 −438 −495 −545 −594 tH 313 354 399 445 500 555 615 668 726 783 825 881 934 525 tS − 7 − 52 − 100 − 147 − 187 − 237 − 285 − 335 − 387 − 436 − 483 − 530 − 581 tH 311 356 395 438 489 537 592 645 692 746 799 850 909 550 tS − 5 − 39 − 74 − 107 − 147 − 192 − 249 − 302 − 352 − 397 − 440 − 486 − 529 tH 300 340 378 423 468 510 560 610 659 710 756 810 865 575 tS 8 − 28 − 66 − 102 − 143 − 181 − 245 − 280 − 336 − 366 − 406 − 443 − 488 tH 312 348 379 414 453 496 544 599 654 708 759 806 847 1 Table 14 shows characterization data for selected fDCI frequencies. Other frequencies are possible, and Table 14 can be used to estimate performance. Table 14 shows the typical times for various DCI clock frequencies that are required to calculate the data valid margin. The amount of margin that is available for tuning of the DSC sampling point can be determined using Table 14. Maximizing the opening of the eye in both the DCI and data signals improves the reliability of the data port interface. Differential controlled impedance traces of equal length (that is, delay) should be used between the host processor and the AD9142A input. To ensure coincident transitions with the data bits, the DCI signal should be implemented as an additional data line with an alternating (010101…) bit sequence from the same output drivers used for the data. The DCI signal is ac-coupled by default; thus, removing the DCI signal may cause DAC output chatter due to randomness on the DCI input. To avoid this, it is recommended that the DAC output is disabled whenever the DCI signal is not present. To do this, program the DAC output current power down bit in Register 0x01, Bit 7 and Bit 6 to 1. When the DCI signal is again present, the DAC output can be enabled by setting Register 0x01, Bit 7 and Bit 6 to 0. Register 0x0D optimizes the DLL stability over the operating frequency range. Table 15 shows the recommended setting. Table 15. DLL Configuration Options DCI Speed Register 0x0D ≥350 MHz 0x06 <350 MHz 0x86 The status of the DLL can be polled by reading the data status register at Address 0x0E. Bit 0 indicates that the DLL is running and attempting lock, and Bit 7 is set to when the DLL has locked. Bit 2 is 1 when a valid data clock in is detected. The warning bits in Register 0x0E[6:4] can be used as indicators that the DAC may be operating in a non ideal location in the delay line. Note that these bits are read at the SPI port speed, which is much slower than the actual speed of the DLL. This means they can only show a snapshot of what is happening as opposed to giving real-time feedback. Rev. A | Page 25 of 72 |
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