VRE100C

[justanothername]

Hi!
I recently saved two VRE100C 10V references from scrap.
The datasheet says:
"...making the VRE100 series the most accurate and stable 10 V reference available..."
https://www.apexanalog.com/resources/products/vre100ds.pdf
The datasheet from thaler where these units came from says 0.5ppm/°C and 6ppm /1000hrs
Does anyone know these references?

[Andreas]

Does anyone know these references?

Not exactly but I have 2 samples of the 5V VRE3050AS.
But these where bought at a time when APEX bought Thaler.
So probably not the quality of older devices.

- 1/f (and lower frequency) noise was much larger than typical datasheet spec and compared e.g. to a LT1027.
- current consumption much lower than datasheet (so no wonder).
- relative large hysteresis (compared to AD586LQ which are much cheaper).

- T.C. was in spec (for my 10-40 deg usually tested range).
  But when selecting among AD586LQ i typically get also some 2-4 out of 10 devices which have below 1 ppm/K.

with best regards

Andreas

[Mickle T.]

I have tested several dozen of VRE305K. The results are very inconsistent.
http://radiokot.ru/forum/viewtopic.php?p=3997380#p3997380 (Use Google Translate)

[macaba]

Attached is the data from my batch of VRE102CA

[Andreas]

Hello,

these are excellent values for a 10 V reference which is usually 6 uVpp (0.6 ppm/V). Which date code?

my two samples (VRE3050AS) have 9-10 uVpp (and should have 3 uVpp for a 5 V buried zener reference)

Attached evaluation of my 2 samples with 10 s measurement window.

And a "typical" screen shot.

with best regards

Andreas

[TurboTom]

Let's play a little "necromancy" since I've also salvaged two VRE100C (the original Thaler variety) with datecodes from 1999 and 2001, originating from STI "Superfilters" that I tore down for the cryocoolers they contain. Alongside of these engineering marvels (air liquification has some magic to it...), a lot of high-quality electronics stuff could be salvaged, many ultra low tolerance resistors, low offset op-amps and precision caps are useful items.

But the Thaler voltage references are probably the most valuable and useful (electronic) components, especially since they are well aged and shouldn't drift virtually anymore. After they spent enough time in the drawer, I finally went ahead and made two nice reference sources, powered by two 9V block batteries each. I also added a trimmer to the fine tune inputs in case I'ld get access to a really accurate 10V source. The pre-regulator duplicates as a on/off switch. Current consumption is 5mA as specified. Since I'm currently out of 9V batteries, I didn't start "real" testing yet, but performance appears promising when powered from a lab supply.

FYI, I attached the schematic and a photo of the references. If someone (preferably from europe due to the ease of shipping) would like one of these PCBs, I'll be happy to share them at expense since I've got three left that I won't have any use for.

Cheers,
Thomas