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Computing effective resolution for data converters

Posted: 23 Apr 2013 ?? ?Print Version ?Bookmark and Share

Keywords:effective resolution? Analogue systems? analogue-to-digital converter?

It is often the case that an application uses a part of the analogue range of a data converter. Calculating the effective resolution when it uses half or quarter is easy. This tutorial explains how to calculate the effective resolution when we use any fraction of the range.

Analogue systems normally have some overhead to adjust for gain errors, drifts, design tolerances, or poorly aligned equipment. When converting between the analogue world and the digital world, we need to allow overhead in the digital world too. Consider an industrial control voltage of 0 to 10V. If we only allow an analogue-to-digital converter (ADC) to digitise 10V maximum, then any downstream equipment must be limited to 10V or we lose information. Therefore, in industrial control it is common to allow a 5% or even 20% overhead capability.

View the PDF document for more information.

Originally published by Maxim Integrated Products Inc. at as "Calculating Effective Resolution for Data Converters".

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