AVR-Chat

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.