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AD7980 Datasheet(PDF) 20 Page - Analog Devices

Part No. AD7980
Description  16-bit, 1 MSPS PulSAR ADC in MSOP/QFN
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7980 Datasheet(HTML) 20 Page - Analog Devices

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Preliminary Technical Data
Rev Pr C | Page 20 of 22
The printed circuit board that houses the AD7980 should be
designed so that the analog and digital sections are separated
and confined to certain areas of the board. The pinout of the
AD7980, with all its analog signals on the left side and all its
digital signals on the right side, eases this task.
Avoid running digital lines under the device because these
couple noise onto the die, unless a ground plane under the
AD7980 is used as a shield. Fast switching signals, such as CNV
or clocks, should never run near analog signal paths. Crossover
of digital and analog signals should be avoided
At least one ground plane should be used. It could be common
or split between the digital and analog section. In the latter case,
the planes should be joined underneath the AD7980s.
The AD7980 voltage reference input REF has a dynamic, input
impedance and should be decoupled with minimal parasitic
inductances. This is done by placing the reference decoupling
ceramic capacitor close to, and ideally right up against, the REF
and GND pins and connected with wide, low impedance traces.
Finally, the power supplies VDD and VIO of the AD7980
should be decoupled with ceramic capacitors, typically 100 nF,
placed close to the AD7980 and connected using short and wide
traces to provide low impedance paths and reduce the effect of
glitches on the power supply lines.
An example of layout following these rules is shown in
Figure 27 and Figure 28.
Other recommended layouts for the AD7980 are outlined
in the documentation of the evaluation board for the AD7980
(EVAL-AD7980-CB). The evaluation board package includes
a fully assembled and tested evaluation board, documentation,
and software for controlling the board from a PC via the
Figure 27. Example of Layout of the AD7980 (Top Layer)
Figure 28. Example of Layout of the AD7980 (Bottom Layer)

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