> > *It's generally thought of as an amateurish / incomplete way of "dividing" > voltage. But it can work in a pinch . . .*
Well I meant by its self. It's my understanding that an auto ranging circuit is roughly a resistor network( divider ) in conjunction with other parts, in order to achieve a wider range of input voltage measurement. On Tue, Jun 7, 2016 at 1:33 PM, William Hermans <[email protected]> wrote: > >> >> >> *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/CALHSORrKsRFE69z-rzyFD7HGyj4b9P9cfThBqXn6w3b6pkSsFA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
