I've done some searching around, with some mixed results on the proper inte=
rface.

Since the source is 0-10V but 20Mohms (according to the customer), at minim=
um I plan on a 100K/100K divider to range it to 0-5V, and a zener clamp for=
 the ...just in case...since this is an industrial application.

Now, I was thinking...and this is where I've seen it both ways....that I re=
ally want to use a voltage follower on the input, that feeds the divider?=
=A0 This gives a lower impedance input to the PIC's ADC input.=A0 But I've =
seen it where some have said...not necessary...

So? what are the reasons for the opamp (other than stated for impedance int=
erfacing) or just the divider network?


--=20
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