My dad's got a precision lab-grade scale, but recently it stopped working. Tracking the original manufacturer I got hold of the service manual for the scale, and figured out that the fault lies in the ADC module as it doesn't output any data and the pin is floating.
Now the ADC is a quite simple 15-bit multiple ramp converter module, but it is potted into the case quite well, and since it was made in the early 90s I doubt I can get a spare from anywhere, so the final choice is to replicate one.
As you can see from the DS5601 datasheet, the ADC simply does the conversion on its own, and then you can read out the data serially, the conversion takes 10ms so this should be easy to achieve.
The bigger question is what ADC should I choose? The main problem probably being linearity and low drift. I found this LTC2389-18 one at Linear which seems that should be far superior to the original, but I am a little worried that the very fast conversion time could introduce noise into the system.
Any thoughts?