Forrest,

Voltage & Current Requirements?? Isolation Voltage?

Is complete Isolation required, or could an AC coupled charge pump
type circuit be sufficient? (i.e. DC isolation only)

RP

On 27/03/07, Forrest W. Christian <forrestc@imach.com> wrote:
> I'm currently working on a remote telemetry project.   One of the
> requirements is the ability to measure various DC (and possibly AC)
> voltages.   These may be above or below ground, ground referenced, or
> not.   I do have some flexibility with specifying what inputs are
> permitted (voltage), but don't have enough flexibility to say that "all
> signals must be ground referenced and must not be negative in reference
> to ground".  (Actually I might be able to do this, but I'm not going to
> be happy about it long term).
>
> Oh yeah, I'm not thrilled about the prospect of needing a negative
> (below ground) power supply to do this since this is a cost sensitive
> application.  But if I must, I do realize that I could do this with some
> sort of level shifting opamp - but that isn't really the way I'd like to
> do this.
>
> External adc's are not out of the question if needed...
>
> What I'd love is a dirt cheap completely isolated adc, but I realize
> that this isn't going to happen.
>
> Ideas?
>
> -forrest
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