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Thread: What is a Sigma-Delta AtoD converter? [EE]
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face BY : David VanHorn email (remove spam text)



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>> I am using a software implemented Sigma Delta converter in a current
project
>> (using a Z8 :-))

>> Using a Z8 with an internal comparator this essentially allows a converter
>> to be made with a reference, one capacitor and 2 resistors. In practice I
>> add 2 opamp sections before this to provide voltage gain and buffering.
>> Still a cheap and accurate converter. I get about 10 bits of accuracy but
>> more can be had with longer conversion times.


I had a bad experience with one of these.  We were stepping a motor
(microstepping) and sampling, and the best we could get to was 6 bits at
7200s/s.
That /12 on the xtal is a real killer.

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