Tnx SayZer ...

no need for opamp for the adc

have tryed this :

(+)
|
10K
|
+------[47K]---+--> AD
| |
PT1000 100n
| |
| |
(GND) (GND)

and this to :

(GND)-- 100nF -- PT1000 -- > AD
this workes fair but not stabil (RC)

is ther a better way to do this ?

/kim