I wish to use a pic to determine a signal which has a resolution of 10
microvolts in 200 millivolts. It also has a requirement for any component to
be in a very small package (ie surface mount and preferably in an 8-pin
SOIC). I can get a 16 bit ADC but the range is usually that of the supply
rail to ground. If I was to look at 10 microvolts in 5 volts then a 20 bit
ADC would be needed. As you can see I would need serial I/O for the digital
side. The ideal solution would be the LTC1298 but with a resolution of 20 bits.

Any ideas would be appreciated.



TIA,

Peter Grey
Neosystems
Australia