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AD9923A データシート(PDF) 29 Page - Analog Devices |
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AD9923A データシート(HTML) 29 Page - Analog Devices |
29 / 88 page AD9923A Rev. 0 | Page 29 of 88 Group A/Group B Selection The AD9923A has the flexibility to use two V-pattern groups in a vertical sequence. In general, all vertical outputs use the same V-pattern group during a sequence, but some outputs can be assigned to a different V-pattern group. This is useful during certain CCD readout modes. The GROUPSEL register is used to select Group A or Group B for each XV output (the LSB is XV1, the MSB is XV13). Setting each bit to 0 selects Group A; setting each bit to 1 selects Group B. If only a single V-pattern group is needed for the vertical outputs, Group A is used by default (GROUPSEL = 0), and the outputs use the V-pattern group specified by the VPATSELA register. If Group B flexibility is needed, the outputs set to 1 in the GROUPSEL register use the V-pattern group selected by the VPATSELB register. For example, Figure 38 shows outputs XV12 and XV13 using a separate V-Pattern Group B to perform special CCD timing. Another application of the Group A and Group B registers is to combine two VPAT groups for more complex patterns. This is achieved by setting the TWO_GROUP register to 1. Figure 39 shows an example of this timing. When TWO_GROUP = 1, the Group A and Group B toggle positions are both used. In addition, length, starting polarity, and number of repetitions are all determined by the appropriate registers for Group A when TWO_GROUP = 1. Figure 40 shows the more complex operation of combining Group A and Group B with repetition. XV1 XV11 HD XV12 OPTIONAL HOLD AREA FOR GROUP A XV13 XV1 TO XV11 USE V-PATTERN GROUP A XV12, XV13 USE V-PATTERN GROUP B Figure 38. Using Separate Group A and Group B Patterns XV1 XV13 HD V-PATTERN GROUP A V-PATTERN GROUP B Figure 39. Combining Group A and Group B Patterns XV1 XV13 HD V-PATTERN GROUP A V-PATTERN GROUP B GROUP A REP 1 GROUP A REP 2 GROUP A REP 3 Figure 40. Combining Group A and Group B Patterns, with Repetition |
同様の部品番号 - AD9923A |
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同様の説明 - AD9923A |
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