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AD4000 Datasheet(PDF) 35 Page - Analog Devices |
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AD4000 Datasheet(HTML) 35 Page - Analog Devices |
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35 / 36 page  Data Sheet AD4000/AD4004/AD4008 Rev. C | Page 35 of 36 LAYOUT GUIDELINES The PCB that houses the AD4000/AD4004/AD4008 must be designed so that the analog and digital sections are separated and confined to certain areas of the board. The pinout of the AD4000/AD4004/AD4008, with its analog signals on the left side and its digital signals on the right side, eases this task. Avoid running digital lines under the device because they couple noise onto the die, unless a ground plane under the AD4000/AD4004/AD4008 is used as a shield. Fast switching signals, such as CNV or clocks, must not run near analog signal paths. Avoid crossover of digital and analog signals. At least one ground plane must be used. It can be common or split between the digital and analog sections. In the latter case, join the planes underneath the AD4000/AD4004/AD4008 devices. The AD4000/AD4004/AD4008 voltage reference input (REF) has a dynamic input impedance. Decouple the REF pin with minimal parasitic inductances by placing the reference decoupling ceramic capacitor close to (ideally right up against) the REF and GND pins and connect them with wide, low impedance traces. Finally, decouple the VDD and VIO power supplies of the AD4000/AD4004/AD4008 with ceramic capacitors, typically 0.1 µF, placed close to the AD4000/AD4004/AD4008 and connected using short, wide traces to provide low impedance paths and to reduce the effect of glitches on the power supply lines. An example of the AD4000 layout following these rules is shown in Figure 64 and Figure 65. Note that the AD4004/ AD4008 layout is equivalent to the AD4000 layout. EVALUATING THE AD4000/AD4004/AD4008 PERFORMANCE Other recommended layouts for the AD4000/AD4004/AD4008 are outlined in the user guide of the evaluation board for the AD4000 (EVAL-AD4000FMCZ). The evaluation board package includes a fully assembled and tested evaluation board with the AD4000, documentation, and software for controlling the board from a PC via the EVAL-SDP-CH1Z. The EVAL-AD4000FMCZ can also be used to evaluate the AD4004/AD4008 by limiting the throughput to 1 MSPS/500 kSPS, respectively, in its software (see the UG-1042). Figure 64. Example Layout of the AD4000 (Top Layer) Figure 65. Example Layout of the AD4000 (Bottom Layer) |
Similar Part No. - AD4000_17 |
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Similar Description - AD4000_17 |
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