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'[EE]:: DIY 0.01% voltage referEnce without too too'
2011\03\24@092119 by RussellMc

face picon face
OK reference source for most uses.
Better can be bought but this is "not too bad" for the money.

Element 1110 $4.89 NZ in ones
nz.element14.com/analog-devices/adr3430arjz/ic-volt-ref-3v-6sot23/dp/1843662
<nz.element14.com/analog-devices/adr3430arjz/ic-volt-ref-3v-6sot23/dp/1843662>
http://www.farnell.com/datasheets/608881.pdf

1.2V reference
0.1% as supplied worst case output error
Call that 1000 ppm for comparison

8 ppm/C -40 - =125
7/50 typ/max ppm with Vin (presumably at 25C or fixed temp)
160 ppm/V Vin max across temp
14/30 ppm / mA sourcing
7/50 ppm / mA sinking

Stability 1000 hours 50C = 30 ppm

SO:

Drive from a 3 terminal regulator.
Load at constant load.
Vaguely oven (eg aircon room).
Or for lower power than ovening, use processor or other to calibrate for
temperature effects.

Should be able to keep under 100 ppm without much effort or 10% of absolute
initial spec.

So MAY be able to build a device at relatively modest cost which can be
assembled untrimmed to 0.01% stability and 0.1% accuracy and trimmed down to
0.01% accuracy.



Russel

2011\03\24@094554 by Xiaofan Chen

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On Thu, Mar 24, 2011 at 9:20 PM, RussellMc <spam_OUTapptechnzTakeThisOuTspamgmail.com> wrote:
> OK reference source for most uses.
> Better can be bought but this is "not too bad" for the money.
>
> Element 1110 $4.89 NZ in ones
> nz.element14.com/analog-devices/adr3430arjz/ic-volt-ref-3v-6sot23/dp/1843662
> <nz.element14.com/analog-devices/adr3430arjz/ic-volt-ref-3v-6sot23/dp/1843662>
> http://www.farnell.com/datasheets/608881.pdf

Overview of ADI Vref is here.
http://www.analog.com/en/references/voltage-references/products/index.html

Be very careful about the "Out TC" value in the table though. It does not
necessary mean the worst case value and it may depend on the package.

We are using ADR03 and ADR43x series with 3ppm worst case
TC. For the ADR03, only the SOIC package and B grade
components offer the 3ppm worst case performance. The ADR43x
now has the MSOP8 option along with the SOIC8 option
which offers the 3ppm performance (B grade only).

-- Xiaofa

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