AD8031ARTZ datasheet(25/32 Pages) AD

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EVAL-AD7903SDZ User Guide

UG-609

Rev. 0 | Page 25 of 32

EVAL-AD7903SDZ LAYOUT

Layout Considerations

When laying out the printed circuit board (PCB) for the AD7903,

follow the recommended guidelines described in this section to

obtain the maximum performance from the converter. Figure 33

through Figure 36 show the recommended layout for the AD7903

evaluation board.

•

Decouple all the power supply pins (VDD1, VDD2, and

VIO) and the REF pin with low ESR and low ESL ceramic

capacitors, typically 10 µF and 100 nF, placed close to the

DUT (U1) and connected using short, wide traces to provide

low impedance paths and to reduce the effect of glitches on

the power supply lines.

•

Separate analog and digital sections and keep power supply

circuitry away from the AD7903.

•

Avoid running digital lines under the device and crossover

of digital and analog signals because these couple noise into

the AD7903.

Figure 32. EVAL-AD7903SDZ Evaluation Board Silkscreen—Top Assembly

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