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--- In AVR-Chat@yahoogroups.com, ahmed adel farid 
<ahmedadelfarid@y...> wrote:

> I need ... information/documentation
> about the Delta Sigma ADC ...

Yes, Google is the way to get general information. You may get better 
hits searching for "Sigma Delta" ADC because that is the more common 
ordering of the terms.

However, this is an AVR group, so I'm obliged to point out that the 
analog-to-digital converters in AVR microcontrollers are successive 
approximation converters, not sigma-delta.  The ZiLOG Z8 Encore! has 
a sigma-delta, though its performance is not as good as the AVRs.

Graham.

Burr-Brown/TExas Inst. has the highest resolution parts.  Between 
Analog Devices and TI you can find a selection of 20 to 24 bit parts 
with conversion rates up to around 4000 per second.  You can not get 
this kind of resolution with SAR parts. Be careful that you look at 
the correct type of Delta sigma.  There are those for Audio which are 
not DC accurate and those that are for instrument use that are DC 
accurate.

Al Welch

--- In AVR-Chat@yahoogroups.com, "Graham Davies" <YahooGroups@e...> 
wrote:
> 
> --- In AVR-Chat@yahoogroups.com, ahmed adel farid 
> <ahmedadelfarid@y...> wrote:
> 
> > I need ... information/documentation
> > about the Delta Sigma ADC ...
> 
> Yes, Google is the way to get general information. You may get 
better 
> hits searching for "Sigma Delta" ADC because that is the more 
common 
> ordering of the terms.
> 
> However, this is an AVR group, so I'm obliged to point out that the 
> analog-to-digital converters in AVR microcontrollers are successive 
> approximation converters, not sigma-delta.  The ZiLOG Z8 Encore! 
has 

> a sigma-delta, though its performance is not as good as the AVRs.
> 
> Graham.

--- In AVR-Chat@yahoogroups.com, "alwelch93021" <alwelch@a...> wrote:
> 
> Burr-Brown/TExas Inst. has the highest resolution parts.  Between 
> Analog Devices and TI you can find a selection of 20 to 24 bit 
parts 
> with conversion rates up to around 4000 per second.  You can not 
get 
> this kind of resolution with SAR parts. Be careful that you look at 
> the correct type of Delta sigma.  There are those for Audio which 
are 
> not DC accurate and those that are for instrument use that are DC 
> accurate.
> 
> Al Welch

Maxim and TI both had data sheets recently about ADC chip and both 
offered some idea of the functions and abilities of both.

if you are doing instrument low level measuring I have an old 
book, 'Low level measurments'  free for the cost of shipping.  
Paperback, around 200 pages.  very informative information for those 
who have need of getting the signals.  

Dave