On Tue, 7 Jun 2016 09:43:50 -0700 (PDT), you wrote: >Any suggestions or part numbers are much appreciated! Please, if it's not >to difficult, let me know which op-amps you've used.
MCP604SL, and there are 1 and 2 amp versions of that chip. It's currently protecting an XMEGA (3.3 volt VCC here and 3.3 volts max ADC input, practical input level 2.5 volts due to reference). Check the specs, I think it's microchip and available from Mouser. The 324 has a maximum output of about VCC - 1.25 volts, which is OK, if you can live with that. Supposedly you can go down to ground. The 604 has a different voltage limit depending on the configuration, so you need to be a bit careful with it. It's inexpensive, though, so it may work for your application. It's in a +/- 20 volt 1.5 amp power supply board that allows current measurement and setting output voltage from the XMEGA's onboard DACs. (it's really intended for a transistor curve tracer, still in development). Harvey > >I've worked with the LM324 in the past for another project so I'm >relatively comfortable with this one. > >Thanks again all! > >On Tuesday, June 7, 2016 at 1:33:40 AM UTC-7, Chris Green wrote: >> >> Harvey White <[email protected] <javascript:>> wrote: >> > >3. What is the "normal" way of using the BBB analog inputs with 5V >> levels? >> > > Is it possible - or is there where I would use a level-shifter or >> zener >> > >diode? >> > >> > Level shifters are generally digital, and zener diodes don't help all >> > that much (and are not really a good idea here). 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. >> >> -- >> Chris Green >> ยท >> >> -- 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/9ahelb52j507mq09g3m0g23gcpf6l1jpi2%404ax.com. For more options, visit https://groups.google.com/d/optout.
