el huitzilo <schmu...@gmail.com> wrote: > [-- multipart/alternative, encoding 7bit, 89 lines --] > > [-- text/plain, encoding 7bit, charset: UTF-8, 35 lines --] > > 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? > The op-amp is to use as a buffer to protect the inputs, not to provide 1.8 volts. The LM10CN op-amps I'm using are such low power devices that one can use the 1.8 volt ADC reference from the BBB to supply them.
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