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AD5024 Fiches technique(PDF) 24 Page - Analog Devices |
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AD5024 Fiches technique(HTML) 24 Page - Analog Devices |
24 / 28 page AD5024/AD5044/AD5064 Data Sheet Rev. F | Page 24 of 28 POWER SUPPLY BYPASSING AND GROUNDING When accuracy is important in a circuit, it is helpful to carefully consider the power supply and ground return layout on the board. The printed circuit board (PCB) containing the AD5024/AD5044/ AD5064/AD5064-1 should have separate analog and digital sections. If the AD5024/AD5044/AD5064/AD5064-1 are in a system where other devices require an AGND-to-DGND connection, the connection should be made at one point only. This ground point should be as close as possible to the AD5024/AD5044/AD5064/AD5064-1. The power supply to the AD5024/AD5044/AD5064/AD5064-1 should be bypassed with 10 µF and 0.1 µF capacitors. The capaci- tors should be as physically close as possible to the device, with the 0.1 µF capacitor ideally right up against the device. The 10 µF capacitors are the tantalum bead type. It is important that the 0.1 µF capacitor have low effective series resistance (ESR) and low effective series inductance (ESI), such as is typical of common ceramic types of capacitors. This 0.1 µF capacitor provides a low impedance path to ground for high frequencies caused by transient currents due to internal logic switching. The power supply line should have as large a trace as possible to provide a low impedance path and reduce glitch effects on the supply line. Clocks and other fast switching digital signals should be shielded from other parts of the board by digital ground. Avoid crossover of digital and analog signals, if possible. When traces cross on opposite sides of the board, ensure that they run at right angles to each other to reduce feedthrough effects through the board. The best board layout technique is the microstrip tech- nique, where the component side of the board is dedicated to the ground plane only and the signal traces are placed on the solder side. However, this is not always possible with a 2-layer board. |
Numéro de pièce similaire - AD5024 |
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Description similaire - AD5024 |
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