>I have been asked to find a microcontroller with the following 
>requirements:

> - must be possible to add memory card for data logging
> - full-speed USB 12 Mbps
> - at least 40 pins or near (more or less)
> - at least 10-30 ADC's
> - very fast "cpu"
> - quite popular make/model so that I can get help for it

With such a potentially demanding specification it would help if you 
could tell us as much as possible about the requirement as it may (and 
probably will) greatly influence the answer.

eg "8 bit ADC's sampled once per second on average with sequential 
sampling of channels OK and up to half a second timing jitter between 
consecutive samples of the same channel" would be far far (far) easier 
to satisfy than eg "12 bit accuracy, 10 uS conversion time, all 
channels must be sampled simultaneously (to within 20 ns), no more 
than 50 ns jitter between consecutive samples on the same channel".

Knowing target cost would also be of value.

Also - it may be possible to use multiple processors or multiple A2D 
building blocks depending on whether the single IC specification is 
essential or relatively arbitrary.

Knowing the data source and the use to which it will be put in as much 
detail as you can reveal would also very probably greatly help.




        Russell


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