Hi Bob,
Many thanks for your help. I've done 2 identical circuits as defined in Figure 24 on hole board test. As said before, first one did measurements but I had a an output indicating I'm out of input range. With the second one, output seems valid : I observe output corresponding to measured input range (I read from -0.6mV to ~19mV).
Now I haven't any filter before analogic inputs. Have you got some reference values for "anti-aliasing or EMI/RFI noise filtering" components according to figure 24? I read some interesting doc about it :
http://www.ti.com/lit/ml/slyp163/slyp163.pdf
http://www.ti.com/lit/ug/sbau120b/sbau120b.pdf
Now I have to choose between given solutions ...
Lahorde