Voltage References are usually not able to deliver much more than a few 10mA.
Having a stable reference means no big temperature gradient on the die, so that precludes a big pass transistor. Most likely, you will have to roll your own. Using TL431 types of shunt regulator with a single bipolar transistor yields a simple and high performing regulator (at least much higher than most 3 terminal series regulators) particularly if you use the Linear Tech equivalent part (forgot the part number at the moment, but look for shunt regulators) Didier KO4BB On December 8, 2014 4:59:24 PM CST, Bob Camp <kb...@n1k.org> wrote: >Hi > >As with anything else it’s a matter of “what’s in your wallet”. > >The parts you are after are called voltage references rather than >voltage regulators. You can get them well down into the low ppm’s / C >or lower. The cutoff is more a function of “do you want to spend $100 >or not” rather than a specific level you simply can’t get to. > >Bob > >> On Dec 8, 2014, at 1:18 PM, Dan Kemppainen <d...@irtelemetrics.com> >wrote: >> >> Hi, >> >> In playing with some oscillators and a GPSDO here, I think I'm seeing >a voltage sensitivity issue. >> >> So, I started looking at the output voltage of various regulators vs. >temp. Using standard LM/UA type linear regulators and some LDO's, they >all appear to be pretty sensitive to temperature. (millivolt / few >degrees Fahrenheit sort of sensitivity). Most of the datasheets seem to >ignore temp sensitivity. Almost like they are so bad they don't want to >publish it... >> >> Does anyone have hints on TO-220 or D-Pak type regulators that have >really good temp coefficients and good line regulation? A few PPM/Deg C >might be nice, if possible. Or am I into a 'roll you own' type >design... >> >> Dan >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. -- Sent from my Motorola Droid Razr HD 4G LTE wireless tracker while I do other things. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.