> I am planning to read some 0.5V to 4.5V sensor
> voltages, and need good 0.5V and 4.5V precission
> references. I plan to use Analog Devices REF194
> to get the 4.5V, but don't know how to get the
> 0.5V without using resistors, op-amps, etc.

Use ground as the lower reference.  Do you really need the extra precision
from a 4V range instead of a 4.5V range?


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