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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD9735BBC датащи(PDF) 47 Page - Analog Devices |
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AD9735BBC датащи(HTML) 47 Page - Analog Devices |
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47 / 72 page  AD9734/AD9735/AD9736 Rev. A | Page 47 of 72 CROSS CONTROLLER REGISTERS The AD973x differential output stage is adjustable to equalize the charge injection into the positive and negative outputs. This adjustment impacts certain performance characteristics, such as harmonic distortion or IMD. System performance can be en- hanced by adjusting the cross controller. If the system is calibrated after manufacture, adjust the cross controller offsets to provide optimum performance. To start, increment DNDEL<5:0> (Reg. 11, Bits 5:0) while observing HD2 (second harmonic distortion) and/or IMD to find the desired optimum. If DNDEL does not influence the perform- ance, set it to 0 and increment UPDEL<5:0> (Reg. 10, Bits 5:0). Based on system characterization, set one of these controls to the maximum value to yield the best performance. Figure 85 shows the effect of UPDEL and DNDEL. INCREMENT DNDEL TO MOVE THE CROSSING TOWARD THE IDEAL VALUE IDEAL DIFFERENTIAL OUTPUT CROSSING ALIGNMENT INCREMENT UPDEL TO MOVE THE CROSSING TOWARD THE IDEAL VALUE Figure 85. Effect of UPDEL and DNDEL |
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