Ref80 - A competition to ADR1001?

[branadic]

"REF80 is a buried zener, internal heater compensated voltage reference. The device is designed with an extremely low temperature drift and long-term drift. REF80 is also a low noise device."

https://device.report/m/158081276c8014e611d4be1e2e7e80c15bf10773f92c56a97763852ea16d52fd.pdf

Has TI really worked on a competition to ADR1001? HP3458A reading in figure 2-3 indicates a zener voltage of 7.577 V.

-branadic-

[mendip_discovery]

"REF80 is a buried zener, internal heater compensated voltage reference. The device is designed with an extremely low temperature drift and long-term drift. REF80 is also a low noise device."

https://device.report/m/158081276c8014e611d4be1e2e7e80c15bf10773f92c56a97763852ea16d52fd.pdf

Has TI really worked on a competition to ADR1001? HP3458A reading in figure 2-3 indicates a zener voltage of 7.577 V.

-branadic-

oooh, that sounds interesting. I guess AD have kinda dropped the ball a bit with the ADR1001 as they have only managed to produce a new ref much like the old one but not as good (YMMV).

Looks like this is very early info so will wait to see what happens.


EDIT:
Looking at the site there is a REF70,
https://www.ti.com/lit/ds/symlink/ref70.pdf

Long-term stability: 1k hrs: 35 ppm
Coefficients: 2ppm per deg C

even newer is the REF54,
https://www.ti.com/product/REF54

[iMo]

Let us wait on REF90.. With the opamps and 5V/10V dividers in the oven.
What is interesting to see is the pcb layout of the eval kit - how are the slots around the package arranged..

[jbb]

Having another vendor for high precision references would be welcome.

I wouldn’t expect a drop-in replacement, but having a competitor to Analog Devices in the game is a good thing.

[laichh]

Identical file was found on ti.com domain:

https://www.ti.com/lit/ug/snau304/snau304.pdf

From the schematic in Figure 4-1, this REF80 doesn't have the derived output (+5 V, +10 V...) like the ADR1001, only the zener output at ~7.6 V is available.

Traditionally, TI's alternative is often (if not always) cheaper than ADI. ADR1001 1ku listed price on ADI is $66.34, I would expect this REF80 to be range between $35 ~ $50 each. 

[ArdWar]

Interesting, the pinout is MostlyCompatible™ with ADR1001.

Is this TI's first foray into buried zener technology? I don't think their other references are buried zener (LMx99 don't count )

[Andreas]

What about REF102 (Burr Brown Division)?

[3roomlab]

nice
the slotting they use is so small
like size of the 2.54mm pin (~ 0.4mm ?)
* mr imo is right, more like 1mm slot

[Kleinstein]

What about REF102 (Burr Brown Division)?

The REF102 is a nice 10 V reference, but the metal case seems to be no longer available.


How good the Ref80 will actually be is still unclear. There is not even a preview data-sheet. It may as well be more competing with the LCC version or the ADR1399.

The slightly higher voltage is a bit odd and rather high for zener plus PN junction.

[iMo]

nice
the slotting they use is so small
like size of the 2.54mm pin (~ 0.4mm ?)
..

The pitch of the package pins is 1.27mm. Thus the slots are aprox 1mm wide, imho.
The slots' layout seems to help with the mechanical stress as well.
So let us copy that layout for the ADR1001 as well..

[Kleinstein]

The slots are for mechnical stress and to keep the thermal loss low, though much of the heat loss can still be via the copper traces. It thus makes sense to have separate drive and sense pins for the output and also separate grounds for the reference and the heater.

[iMo]

The slots are for mechnical stress and to keep the thermal loss low, though much of the heat loss can still be via the copper traces. It thus makes sense to have separate drive and sense pins for the output and also separate grounds for the reference and the heater.

I've been planning the pcb for 2y already  and perhaps the other owners do too, let us continue in the ADR1001 thread and let us design the pcb finally..