[SI-LIST] Re: Electrical wiring questions

Since you are stuck with a single-ended sensor, I don't see how
the differential ADC will cancel any noise. Probably best to
just use it in single-ended mode.

--
Daniel


> From: "Mike S." <powersurf@xxxxxxxxx>
> Hello to all,
> I would like to ask for some advice and orientation on electrical
> wiring matters!
> I believe this configuration is very common:
> I have an analog sensor with 3 wire leads (Vcc -5 V-, GND, signal)
> that will be sampled by a fully differential ADC that is on a separate
> PCB. I only have one 5 V power supply to power both the sensor and the
> ADC PCB (this card is also 5V). I believe that the best way to connect
> this setup is to power the ADC PCB and then, with a single connector
> from the ADC PCB to sensor, containing 3 pins (Vcc,GND and signal).
> This way would avoid ground loops. The problem is that I don't have
> such a connector in the ADC PCB. In fact, I only have a connector with
> 2 pins (Signal+ and Signal-, that are the ADC differential pins). So
> the sensor must be powered from the same power supply, but with a
> different cable that will not originate in the ADC PCB, but directly
> in the power supply.
> Since the connector to the sensor in the ADC PCB doesn't have any
> ground pin the sensor return current would have to return in the power
> supply ground wire. Although the ADC has fully differential inputs
> (that would cancel any induced currents in the loop) I don't think
> this is a good solution. Is it?
>=20
> Any suggestions or comments are welcome.
> References like books or other publications that deal with these
> matters are also welcome.
>=20
> Thanks in advance
> Best Regards
>=20
> B. Mike


--=20
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