> > > > > *In my somewhat amateurish approach to this I was planning to use a DC-DC > converter to provide 1.8 VCC for my sensors. I'm still learning about > op-amps and anything more advanced than a transistor, so I wonder whether > there are any advantages to using an op-amp compared to providing 1.8 V > from a switching DC-DC converter?I would be very grateful if one of the > electronically literate participants to this discussion would share their > insight with a newbie :)*
What you're talking about does not make any sense. an ADC measures voltage. ADC's do not have sensors connected to them. ADCs can use op-amps ( I suppose ) to scale input voltages to except-able levels for a given ADC. But you can also use a resistor network to achieve a similar end goal. But perhaps while a resistor network will work most of the time. It's generally thought of as an amateurish / incomplete way of "dividing" voltage. But it can work in a pinch . . . On Tue, Jun 7, 2016 at 1:03 PM, el huitzilo <[email protected]> wrote: > Hi, > > chiming in here because I'm about to build my first circuit that uses ADCs > on BBB... > > > My standard advice >>> > would be to run the analog voltage through a non-inverting op amp >>> > configured as a gain stage. You run the op-amp (and have to pick one >>> > that does rail to rail and also runs from 1.8 volts) from the 1.8 volt >>> > supply. >>> > >>> Yes, that's what I do. There are quite a few very low power op-amps >>> suitable for running from the 1.8 volt rail on the BBB. If OP is >>> interested I can look up the device, it's from TI if I remember. >>> >> > In my somewhat amateurish approach to this I was planning to use a DC-DC > converter to provide 1.8 VCC for my sensors. I'm still learning about > op-amps and anything more advanced than a transistor, so I wonder whether > there are any advantages to using an op-amp compared to providing 1.8 V > from a switching DC-DC converter? > > I would be very grateful if one of the electronically literate > participants to this discussion would share their insight with a newbie :) > > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/46bc9c1f-6931-4f89-b685-11a2df142aba%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/46bc9c1f-6931-4f89-b685-11a2df142aba%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORq%3DavWKbBnFo3Ao7Tqwi3kj2WdGbmF1SZqBRiMY2%2BobWA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
