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Home / accuracyInvestigation
Name Modified Size InfoDownloads / Week
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Hardware 2013-02-25
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ATmega328Accuracy.pdf 2012-07-26 702.7 kB
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README 2012-07-26 671 Bytes
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ATmega328AccuracyFiles.tgz 2012-07-24 545.2 kB
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Totals: 4 Items   1.2 MB 0 
This project addresses accuracy issues when driving an ATmega328 ADC.
Tests include:
   - sinewave test with external source (soundcard),
   - sinewave test with DAC
   - ramp with DAC
Results obtained on breadboards:
   - ENOB 9.4
   - Integral Nonlinearity 0.06%
   - Differential Nonlinearity (RMS) 5.6%.
The sinewave tests are executed in conjunction with LXSNDTEST, also available on
Sourceforge (LINUX only).
Schematics shown:
   - preamplifiers with standard 1MOhm||33pF input impedance
   - interface circuit for serial and USB port, with option for electrical insulation.
   - ATmega328 driving a DAC MAX503.
Source code in C and Arduino sketches are included.
Source: README, updated 2012-07-26