this is a java interactive tutorial hope helps **broken link removed**
try also this
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hope these helps if useful
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Follow the attachment, it has DAC Structures like - Low Distortion DAC architectures, DAC Logic, Sigma-Delta DACs and Direct Digital Synthesis (DDS) with proper explanations and figures.
if u need the complete book - it is ' mixed signal & DSP technique' from www.gigapedia.com - free ebook club.