APEX voltage reference on Mouser website ? - Page 1
Forum section: electronics / general

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 02, 2024, 05:15:08 pm
content: HelloDuring my quest of ceramic package for the Geller circuit I have loacted that on Mouser websiteAPEX VRE310AD with quite impressive performanceWhat do you think ? innovative orRegardsOS

author: iMo
author_rank: Super Contributor
timestamp: June 02, 2024, 05:30:20 pm
content: Is it epoxy package?

author: The Soulman
author_rank: Super Contributor
timestamp: June 02, 2024, 05:33:11 pm
content: "Low-cost" should be taken with a pinch of salt.Otherwise it doesn't seem to be to bad, on par with adr1001

author: iMo
author_rank: Super Contributor
timestamp: June 02, 2024, 05:41:40 pm
content: Based on its DS it is a standard zener with an opamp plus a resistive compensation network.Most probably epoxy package. Perhaps at the epoxy LT1021-10 (or similar) level, or worse..

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 02, 2024, 05:51:13 pm
content: Quote from: iMo on June 02, 2024, 05:41:40 pmHelloyes I agree but that a 100 USD IC .... a bit spicy compare to proven solution , except for limited room on PCB but keep this performance level with time can be difficult I thinkRegardsOS

author: iMo
author_rank: Super Contributor
timestamp: June 02, 2024, 06:08:33 pm
content: Quote from: Overspeed on June 02, 2024, 05:51:13 pm$100? For 100 pieces?Initial accuracy is good (much better than others, afaik), but there are the other parameters to consider as well. Take its DS and compare with any other voltage references.

author: Andreas
author_rank: Super Contributor
timestamp: June 02, 2024, 06:38:10 pm
content: Hello,I have 2 samples of VRE3050AS. (A 5V variant of the VRE310)I got them from DIGIKEY near the change from Thaler to APEX.(so quality may have changed since then).It is a special (non standard) ceramic package.But it has the same problems as all SMD packages (like LS8) when soldered directly to a EPOXY PCB.One of the 2 samples had marginal T.C. according to spec the other on spec near room temperature.But both had larger hysteresis than comparable references.And both were noisy ~10uVpp against 3 uVpp in the datasheet.Noise was even visible in 1 minute averages of my ADCs.PSRR ~200uV/V output change demands for a well stabilized power supply.So personally I find the price/performance ratio of a AD586/AD587 in CerDip Package is much more attractive.with best regardsAndreas

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 02, 2024, 08:10:11 pm
content: Hellothey produce other IC ashttps://www.apexanalog.com/products/vre102.htmlBut for the price , there is more proven solutionsRegardsOS

author: Mickle T.
author_rank: Frequent Contributor
timestamp: June 03, 2024, 09:11:29 am
content: It was quite interesting to study and write essays about the biography of the founder of THALER Corp. However, words cannot express how great my disappointment was in the quality parameters of the voltage references of this company.There is currently a stock of VRE102M (with mil. spec) up for sale on one of the local marketplaces. However, I do not see any excitement among buyers, even despite the wholesale price of $35.

author: HalFoster
author_rank: Frequent Contributor
timestamp: June 03, 2024, 12:02:19 pm
content: I have a handful of the VRExxxx parts from when they were made by Cirrus and would second the opinions given above - they were marketed primarily for their initial accuracy and low (especially at the time) tempco. They tended to be noisy and had a low to moderate amount of drift. I have 4, of different voltages, that have been more or less constantly burning in for over 10 years now - it's been a long time since I did any long term tests so I guess that I need to blow the dust off and do that before long. Anyway for high stability and relatively low cost I use the Maxim 62xx and 63xx series references - put them in a good filter/buffer and they will pretty much do anything that you need. For most all needs today though, just get a nice part, age it a bit and calibrate out any errors in software.Hal

author: iMo
author_rank: Super Contributor
timestamp: June 04, 2024, 06:37:05 am
content: Those part are expensive because of their package. The ceramic materials, gold bond wires, gold plating, hybrid thin/thick film technology adds today a lot to the final "market price" (95% my guess). The reference itself could be kind of a "12-14bit ADC/DAC" parameters (at typical 10V FS it means something like 600uV resolution), however (as the most references we talk here were designed long time back for that purpose). This APEX ref is also expensive because of its trimmed initial accuracy, so good for a mass production of goods required such an initial accuracy. What people want in this section is the long term stability, low noise, low TC and the initial accuracy is not so important.

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 05, 2024, 05:49:12 am
content: @IMOHelloWhat people want in this section is the long term stability, low noise, low TC and the initial accuracy is not so important.Initial accuracy is an interesting parameter if and only if that able to be stable in time , trim something to reach a level of accuracy and lost the performance is a bit questionable except if that for an instant use as a rocket launch where electronic will be not recovered .APEX dont claim their performances are not '' life time'' not include the noise if I read all the commentsStrange way to make production and marketingRegardsOS