Hi Most good DAC’s show you information on temperature / supply / and reference stability (along with a bunch of other stuff like noise …). You are paying for those parameters when you buy a “good” DAC.
The TBolt has a “home brew” DAC and (maybe) feedback setup. For whatever reason (one would guess cost) they did it all themselves in a FPGA rather than running a “stock” chip. You can trace out portions of the setup. Once it goes back into the FPGA …. who knows. Some sort of Sigma Delta Something Somewhere is probably a good guess. Bottom line is, you can’t just go to the label on this or that chip and grab the data sheet for “the DAC”. I don’t even recall anybody finding “the reference IC” for “the DAC”. They may well have and I’ve simply forgotten over the last 10 or 15 years ... What you *could* do is to rig up a Volt Nuts grade bench, set the DAC to various voltages and run the beast over temperature. Somehow that sounds like a lot of work. Unless you have a “group” it would only tell you part of the story …. Bob > On Jul 25, 2021, at 5:03 AM, Hal Murray <[email protected]> wrote: > > > [email protected] said: >> If that were true, it would mean that the actual EFC voltage in those units >> was varying with respect to the DAC voltage as reported over the Tbolt's >> serial port. While not impossible (after all, we know almost nothing about >> the internal architecture of the Tbolt), for a number of reasons I think >> that is unlikely. > > The only thing that the TBolt can report is the number that it feeds to the > DAC. > > I expect the actual voltage out would vary with temperature, supply voltage, > age, and whatever. Add in the reference voltage if that's not included in > the > DAC. > > I haven't looked at DAC data sheets recently. How many of the modern ones > have a set of small graphs showing parameters like that? > > > -- > These are my opinions. I hate spam. > > > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send an > email to [email protected] > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
