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Thread: What is a Sigma-Delta AtoD converter? [EE]
picon face BY : Brandon, Tom email (remove spam text)

http://www.dspguide.com/ has the full text to the Scientist's And Engineer's
Guide to DSP. Chapter 4 (ADC And DAC) has a nice low-maths explanation of
how they work.

Wagner's quite right, except I believe that you will still find a few
high(ish) accuracy non sigma delta converters as sigma delta converters
aren't very appropriate for time domain encoded information (e.g. any form
of echo location system (sonar, radar et al)). Sigma delta converters (sigma
= sum, delta = change = sum of changes converter) produce a value that
represents the AVERAGE voltage in the conversion period (or average slope of
voltage (not commercially used I don't think)) rather than the instantaneous
voltage at a known point in the conversion process. i.e. in a 1kHz SD
converter you'd know the average coltage for each 1ms period. This is fine
for frequency encoded signals such as audio but if you need to know the
shape of a wave then they're not especially suitable.

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Subject (change) What is a Sigma-Delta AtoD converter? [EE]

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