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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