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readme 2012-08-01 854 Bytes
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ATmega328Accuracy.txt 2012-07-26 721 Bytes
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The results of an investigation into the accuracy of the ATmega328 ADC are presented.
LXSNDTEST was used extensively for the project. 
Results for the following tests are included:
   - sinewave test with external source (soundcard),
   - sinewave test with DAC
   - ramp with DAC
Measured results obtained on solderless breadboards:
   - ENOB 9.4
   - Integral Nonlinearity 0.06%
   - Differential Nonlinearity (RMS) 5.6%.
Several circuits were used in conjunction with the ATmega328; their schematics are
   shown in the report:
   - 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.

The files are located with the LXARDOSCOPE project, also available from Sourceforge.
Source: readme, updated 2012-08-01