On 06/29/2010 01:45 AM, Hal Murray wrote:
The one I'm building up is a ADS1278
http://focus.ti.com/lit/ds/symlink/ads1278.pdf
There are others in the series with fewer inputs. As with a lot of
converters, there isn't a whole lot of data on them.
What are you looking for?
There is a section of DC parameters on page 3.
No missing codes: 24 bits
INL: 0.0003% (typical), 0.0012% (max)
Offset drift: 0.8 microvolts/C (typical)
Gain drift: 1.3 ppm/C (typical)
There are also some useful plots relating to temperature dependence
among other things, things relating in particular to long term aspects.
Choosing the right Vref value can be among the things to do to get the
performance.
Also, TI claims it to address both the DC precision and audio
properties. Looks like a good choice to me. Naturally, things must be
tested and tried.
Cheers,
Magnus
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