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AD4000 Datasheet(PDF) 35 Page - Analog Devices

Part # AD4000
Description  Precision, Pseudo Differential, SAR ADCs
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD4000 Datasheet(HTML) 35 Page - Analog Devices

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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)


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