Datasheet
ADC141S626
SNAS434B –NOVEMBER 2007–REVISED MARCH 2013
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Generally, analog and digital lines should cross each other at 90° to avoid crosstalk. However, to maximize
accuracy in high resolution systems, avoid crossing analog and digital lines altogether. It is important to keep
clock lines as short as possible and isolated from ALL other lines, including other digital lines. In addition, the
clock line should also be treated as a transmission line and be properly terminated. The analog input should be
isolated from noisy signal traces to avoid coupling of spurious signals into the input. Any external component
(e.g., a filter capacitor) connected between the converter's input pins and ground or to the reference input pin
and ground should be connected to a very clean point in the ground plane.
A single, uniform ground plane and the use of split power planes are recommended. The power planes should be
located within the same board layer. All analog circuitry (input amplifiers, filters, reference components, etc.)
should be placed over the analog power plane. All digital circuitry should be placed over the digital power plane.
Furthermore, the GND pins on the ADC141S626 and all the components in the reference circuitry and input
signal chain that are connected to ground should be connected to the ground plane at a quiet point. Avoid
connecting these points too close to the ground point of a microprocessor, microcontroller, digital signal
processor, or other high power digital device.
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