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AD9048KQ Scheda tecnica(PDF) 7 Page - Analog Devices |
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AD9048KQ Scheda tecnica(HTML) 7 Page - Analog Devices |
7 / 8 page AD9048 –7– REV. C Figure 3. Dynamic Performance (20 MHz Encode Rate) Figure 4. Dynamic Performance (35 MHz Encode Rate) LAYOUT SUGGESTIONS Designs that use the AD9048 or any other high speed device must follow some basic layout rules to ensure optimum performance. The first requirement is to have a large, low impedance ground plane under and around the converter. If the system uses sepa- rate analog and digital grounds, both should be solidly con- nected together, and to the ground plane, as closely to the AD9048 as practical to avoid ground loop currents. Ceramic 0.1 µF decoupling capacitors should be placed as closely as possible to the supply pins of the AD9048. For decoupling low frequency signals, use 10 µF tantalum capacitors, also con- nected as closely as practical to voltage supply pins. Within the AD9048, reference currents may vary because of coupling between the clock and input signals. As a result, it is important that the ends of the reference ladder, RT (Pin 18) and RB (Pin 28), be connected to low impedances (as measured from ground). If the AD9048 is being used in a circuit in which the reference is not varied, a bypass capacitor to ground is strongly recom- mended. In applications that use varying references, they must be driven from a low impedance source. Figure 5. Typical Connections |
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