On 7/14/05, Jinx <joecolquitt@clear.net.nz> wrote:
> 
> > Is it as simple as it seems....4-20mA current loops....put across
> > a precision resistor and then feed to the A/D ? Or better....buffered
> > thru a unity gain amp...?
> 
> I'm getting good results with an F88, a 4-20mA depth sensor
> and this
> 
> http://www.maxim-ic.com/appnotes.cfm/appnote_number/823

There is s implest way if you check for a chip containing a voltage
reference and an operational amplifier. Maxim have a few like those.

best regards,
Vasile


> 
> Basically doing what you said. No adjustment or fiddling necessary
> to get 1mV / mm over 5m (apart from grounding pin 1 of the 472,
> which isn't shown above)
> 
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