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Design >> Mixed-Signal Design >> Delta-Sigma latency
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Message started by Cri Azzolini on Oct 3^rd, 2008, 2:26am

Title: Delta-Sigma latency
Post by Cri Azzolini on Oct 3^rd, 2008, 2:26am

Hi all,

I am going to enter the wonderful world of delta-sigma ADCs so I am reading as much as possible on the topic.
Although there is a lot of literature about delta-sigma ADCs, I did not find anything regarding the latency of the conversion (critical for my application).

I suppose that the latency is strongly affected by the modulator architecture and the digital filter architecture/implementation.

Does anybody of you find some useful doc (jounals, application notes, white papers, ...) about latency in delta-sigma ADCs ?

Many thanks in advance, regards.
Cri

Title: Re: Delta-Sigma latency
Post by Berti on Oct 3^rd, 2008, 4:35am

As you already said: The latency is strongly affected by the decimation filter.
Depending on the STF, the modulator might have from 0 to a few clock cycles
latency. But then I think it becomes difficult to predict how long it takes
for the decimation filter to provide a valid output .. without designing one.
I am not even sure if delta-sigma modulation is a good choice for low-latency applications.(?)

Regards