Use an opamp

On 9/2/2018 6:37 AM, Fred Kerr wrote:
> Hello all,
>
> How should the 1.8V ADC (and other) pins be protected? One method may
> be the attached, voltage divider of 1M/100K then limited by two diodes
> in series. (Not tested, just paper design currently.)
>
> I'd like to explore other methods or suggestions. I have some old or
> obsolete parts that I can use with info from data sheets. But it'd be
> nice to go "modern".
>
> What about VCO to optoisolator? (Think of hostile / automotive
> applications.)
>
> Suggestions: Circuits, books, URLs?
>
> Thanks!
>
> Fred Kerr
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