Rainbow Electronics ADC1061 - Manual (Page 10)

6 0 Layout and Grounding
In order to ensure fast accurate conversions from the
ADC1061 it is necessary to use appropriate circuit board
layout techniques The analog ground return path should be
low-impedance and free of noise from other parts of the
system Noise from digital circuitry can be especially trou-
blesome so digital grounds should always be separate from
analog grounds For best performance separate ground
planes should be provided for the digital and analog parts of
the system All bypass capacitors should be located as close to the con-
verter as possible and should connect to the converter and
to ground with short traces The analog input should be iso-
lated from noisy signal traces to avoid having spurious sig-
nals couple to the input Any external component (e g
a
filter capacitor) connected across the converter’s input
should be connected to a very clean ground return point
Grounding the component at the wrong point will result in
reduced conversion accuracy
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