Andreas, If I proceed down this path, it will be a learning experience. As with most learning projects, a bit of 'overkill' is usually present. It's just plain old fun to over engineer something! :) The LM399 does look like a nice package. Do they all come with the thermal shield, or is that an option that needs to be purchased separately? Dan On 11/5/2014 12:00 PM, volt-nuts-request@febo.com wrote: > Message: 1 > Date: Tue, 04 Nov 2014 19:20:09 +0100 > From: Andreas Jahn <Andreas_-_Jahn@t-online.de> > To: Discussion of precise voltage measurement <volt-nuts@febo.com> > Subject: Re: [volt-nuts] Voltage Reference. > Message-ID: <545918D9.2020105@t-online.de> > Content-Type: text/plain; charset=utf-8; format=flowed > > Hello Dan, > > If you dont need the low noise and long term stability of the LTZ1000 then > the LM399 will do the job without special resistors (like T.C. less than > 5ppm/K). > > The only thing that I recommend is to do a good thermal isolation for > the references. > > With best regards > > Andreas

Hello Dan, yes the thermal shield is standard on all LM399. But additional thermal shielding of the pins/housing on both sides of the PCB will improve stability (noise + tilting effects). Since National Semiconductors (TI) has discontinued the LM399, Linear Technology is now the only manufacturer. DigiKey has the LM399 on stock. With best regards Andreas Am 05.11.2014 um 20:02 schrieb Dan Kemppainen: > Andreas, > > If I proceed down this path, it will be a learning experience. As with > most learning projects, a bit of 'overkill' is usually present. > It's just plain old fun to over engineer something! :) > > The LM399 does look like a nice package. Do they all come with the > thermal shield, or is that an option that needs to be purchased separately? > > Dan > > > On 11/5/2014 12:00 PM, volt-nuts-request@febo.com wrote: >> Message: 1 >> Date: Tue, 04 Nov 2014 19:20:09 +0100 >> From: Andreas Jahn <Andreas_-_Jahn@t-online.de> >> To: Discussion of precise voltage measurement <volt-nuts@febo.com> >> Subject: Re: [volt-nuts] Voltage Reference. >> Message-ID: <545918D9.2020105@t-online.de> >> Content-Type: text/plain; charset=utf-8; format=flowed >> >> Hello Dan, >> >> If you dont need the low noise and long term stability of the LTZ1000 then >> the LM399 will do the job without special resistors (like T.C. less than >> 5ppm/K). >> >> The only thing that I recommend is to do a good thermal isolation for >> the references. >> >> With best regards >> >> Andreas > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.