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Maxim > Design Support > Technical Documents > Application Notes > A/D and D/A Conversion/Sampling Circuits > APP 2013
Maxim > Design Support > Technical Documents > Application Notes > Voltage References > APP 2013
Keywords: analog-to-dicital converter, ADC, ADC accuracy, voltage reference scaling technique, ADC
effective resolution, voltage divider, voltage reference
APPLICATION NOTE 2013
Voltage Reference Scaling Technique Increases
ADC Accuracy to Keep Costs Down
By: Franco Contadini
Jun 20, 2003
Abstract: In this design note a circuit uses a 10-bit ADC, voltage divider, and external reference to
improve the ADC's virtual accuracy to 13 bits. The article shows a voltage scaling technique that extends
10-bit ADC range to 13 bits. The MAX159 10-bit ADC, MAX5420 voltage divider, and MAX6141 voltage
reference are featured.
A data acquisition board, in order to provide flexibility, must be able to accommodate various input voltage
ranges. Handling low amplitude signals generally requires an increase in the number of bits of resolution,
increasing cost.
This application note describes a simple circuit that uses a low cost 10-bit ADC but increases the virtual
accuracy to 13-bit.
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