ADR1001 - Ovenized Voltage Reference System

[EC8010]

I've just back-ordered an ADR1001 evaluation board from Mouser UK and been given a 30 July despatch date...

[Kleinstein]

The older high end zener references are in the 6.2 to 7.5 V and maybe 10 V range. This is OK for some uses, but needs extra effort to use with an ADC or DAC chip that wants 5 V at most.
With a 7 V ref and divider down to 5 V the divider can add quite some costs and drift. It is not a principle issue in designing a ref. circuit. The problem is more in getting suitable parts and valid specs for the long term drift part.

Chances are the long term drift depends on the set temperature for the chip. Another point is the mechincal design around the ADR1001.

[floobydust]

Pretty sure the fab is done in Taiwan, hermetic packaging in Philippines. Earthquake and dozens of aftershocks possibly adding a delay.
I will never forgive ADI for shutting down LT Hillview fab in Milpitas CA, which used to make our favorite ref IC's. Longtime proven quality. But it's sadly outsourced now and I would expect issues until the fab pulls it off.

[iMo]

Milpitas list..
I see there only two parts usually discussed here - LTC2057 and LTC665x..

[floobydust]

I remember the LTC Milpitas wafer fab change notice because it included LTFLU1A/SZ263 - which I thought were long obsolete.
It seems to have been wiped, I will keep digging see if I saved it. ADI is not saying a peep about it now.
Anyone know for sure where the LTC refs, including the new ADR1001 are being fab'd?

Other LTC parts i.e. PCN 19_0067 - June 2022 Product/Process Change Notice - 0.35 micron wafer fab from Hillview CA outsourced to Vanguard International Semiconductor Taiwan (subsidiary of TSMC). I suspect they are doing the ref fab.
Also hermetic packaging was outsourced, "22_0324 Feb-2021 ADI Philippines (ADPI) as an assembly plant to replace ADI Hillview for commercial hermetic products in TO5, TO39 and Sidebrazed Packages. {LTFLU1A, LTC1100-10, LTZ1000A}

My point is outsourcing advanced IC technology doesn't go well because the IC's are not yet commodities. It's a bean counter approach. You can't just play Lego with this stuff.
I imagine it's special fab process/lithography, a lot of specialty burn-in and test and manual labour involved- which is not mainstream.
I could be wrong and the production delays are something minor...

[EC8010]

I will never forgive ADI for shutting down LT Hillview fab in Milpitas CA,

I'll never forgive them buying Linear Technology and imposing the AD corporate model. I was told that LT people were very unhappy.

[floobydust]

This "fabless" semiconductor company model can never pull off state of the art. You are totally dependent on your contracted manufacturer.  Otherwise- you have your own people, your own facilities, like LTC, and it worked fine for them.
It is a huge loss for American semiconductor manufacturing in an era where Biden is throwing billions to onshore things.

Finer lithography 0.18u mentioned change "Analog Devices Beaverton OR, USA (ADBN) as an alternate Wafer Fab site to TSMC" I guess ADI has some token fab ability in America. Maxim was also hit with the acquisition and new stupid business model.

EEVblog could get their own voltage reference IC if outsourcing is so easy.

[bastl_r]

Finer lithography 0.18u mentioned change "Analog Devices Beaverton OR, USA (ADBN) as an alternate Wafer Fab site to TSMC" I guess ADI has some token fab ability in America. Maxim was also hit with the acquisition and new stupid business model.

This reminds me of my employer (automotive industry) where the management team consists almost exclusively of business people who believe that everything can be bought in the desired quality at the cheapest prices.
In addition, they overlook the fact that they are continually giving up core competencies that will never come back because the knowledge is gone over time and would have to be bought back at great expense.
Fortunately, I only have just under two years left...
But our children will suffer from these bad decisions!

[floobydust]

This ADR1001 seems to be quite late? About 19 months.
EDN April 10, 2024 "Voltage-Reference IC with Integral Heater Offers Single PPM-Class Results" they did a blurb about it but no mention of availability.