On Tue, 2 Jul 2002 19:11:52 +0200 Alvaro Deibe Diaz <adeibe@CDF.UDC.ES>
writes:
> Hello.
>
> 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.
>
> Any ideas?
>

        How about just subtracting it out in software? If you have enough A/D
resolution to give up the bottom end, this approaches the ideal zero
parts solution.

Harold


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