The Digital-to-Analog Converter (DAC) peripheral can be used to convert the digitally stored
values to an analog output. By setting the voltage reference correctly to define maximum
output value and use a timer to replicate sampling frequency as output frequency, the
original signal is reconstructed. Each sample is held on the output for one output
period (corresponding to the time in between the samples being taken). The example
signal will look similar to the one shown in Figure 1-5.Figure 1-5. Reconstructed Signal
The output filter smoothens the signal from the DAC. In the example used, the output
signal will end up similar to Figure 1-6. The
signal is very similar to the original analog input signal except for the error from
quantization, which is significant in the example displayed since the 3-bit samples have
only eight possible values.Figure 1-6. Output Signal After
Filtering
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