- you probably haven't seen the right one yet.
Yes it seems to be so.
From my point of view this would be a LT1027BCH in a metal can housing.
But unfortunately due to ROHS they are no longer produced.
provide near zero tempco at one temperature only,
Do you have any measurement values to this?
Temperature is not the main issue since I want to do a temperature
correction.
But tempco should be below 1ppm/K (better 0.2ppm/K) in the 18-32 degree
celsius (64-90 °F) range.
If you state what kind of performance you're looking for, it would be
easier to make recommendations.
I want to have high end specs with the power consumption of a battery
supplied DMM.
that is:
tempco below 1ppm/K
hysteresis in the 10-40 degree range well below 1ppm
no sensitivity to humidity (so all plastic housings will fall out)
ageing in the range of 1 ppm/year after some pre-ageing
With best regards
Andreas
----- Original Message -----
From: "Ed Breya" <[email protected]>
To: <[email protected]>
Sent: Saturday, January 26, 2013 7:54 PM
Subject: Re: [volt-nuts] Some questions to zeners (1N823-1N829)
Don't bother with TC zeners, especially for battery operated equipment.
There are lots of nice IC references available from Analog Devices, Maxim,
Linear Technology, TI, an so on, that will run rings around TCZs - you
probably haven't seen the right one yet. The TCZs will only provide near
zero tempco at one temperature only, so would have to be ovenized to get
best performance. They also have an initial voltage tolerance up to a few
percent, so the circuit would need tweaks and maybe amplification that add
more error yet. I doubt that any TCZ will match an LM399 even with very
elaborate circuitry to support it.
I think the Maxim MAX3650 family would be hard to beat for a low power 5 V
reference - my super-duper voltage standard (yet to built) will use four
of them averaged together, and operated at constant temperature.
If you state what kind of performance you're looking for, it would be
easier to make recommendations.
Ed
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