Am 08.12.2014 um 19:18 schrieb Dan Kemppainen: > 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 > Hi Dan,
I like to use the universal LM723C or µA723C, manuf. eg. Ti or NS Short description: it contains a temperature compensated reference source Vref Zener, ext. filter C is connectable to further reduce noise abt. 150 ppm/°K offset drift, but possible to work with ext. ref. as eg. LM129, 1n82x, LM399 etc. still available in N (DIL14), J, U, FK packages The LM723 can produce up to 150mA of output current without additional transistors hp did use it quite often in their equipment. Lot of example circuits and hints can be found in the internet to avoid unwanted oscillations use ceramic Cs as close as possible connected to the circuit. Good luck, Arnold, DK2WT _______________________________________________ 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.