Electronics > Metrology
new voltage reference from MAXIM
BU508A:
Hello,
I received today a newsletter from MAXIM. Seems, they have a new voltage reference:
https://www.maximintegrated.com/en/products/analog/voltage-references/MAX6126.html
From their website:
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Key Features
Ultra-Low 1.3µVP-P Noise (0.1Hz to 10Hz, 2.048V Output)
Ultra-Low 3ppm/°C (max) Temperature Coefficient
±0.02% (max) Initial Accuracy
Wide (VOUT + 200mV) to 12.6V Supply Voltage Range
Low 200mV (max) Dropout Voltage
380µA Quiescent Supply Current
10mA Sink/Source-Current Capability
Stable with CLOAD = 0.1µF to 10µF
Low 20ppm/1000hr Long-Term Stability
0.025? (max) Load Regulation
20µV/V (max) Line Regulation
Force and Sense Outputs for Remote Sensing
************************snipp***********************************
Andreas
uncle_bob:
Hi
Not bad, but not great either. There are now other chips on the market that will beat it noise and stability wise. It was a bit more interesting a while ago.
Bob
uncle_bob:
--- Quote from: DiligentMinds.com on June 11, 2016, 07:48:34 pm ---Here is a paper that is about a study that was done on a small collection of reference chips-- including the MAX6126. It did fairly well in the tests, but of course as always, it would never beat an LM399 or an LTZ1000(A) for hysteresis, temperature, humidity, or time drift.
ANY unheated reference IC will experience hysteresis with large temperature swings. The hermetic packages do better with this, but it is not totally eliminated. The LM399 has almost no hysteresis, and the LTZ1000A has a little more than the LM399-- but both of these are orders of magnitude better than ANY unheated chip [including the LTFLU-1].
This is OK, if the reference fills your need and the various drifts [when added together] are within the specs that you are looking for.
--- End quote ---
Hi
Paper ? (link appears to be missing :) )
I agree with everything you have said. My only point is the missing link.
Bob
necessaryevil:
Yeah, the MAX6126 is a nice one. Forum member Blackdog made a voltage reference using four of them in parallel. Search the forum! You should also check out the LT1021.
Do heated chips really not suffer from hysteresis? If they do, it will be worse than non-heated chips, because the heating will cause them to go through more temperature cycling at turn-on/switch-off.
uncle_bob:
--- Quote from: necessaryevil on June 12, 2016, 03:02:50 pm ---Yeah, the MAX6126 is a nice one. Forum member Blackdog made a voltage reference using four of them in parallel. Search the forum! You should also check out the LT1021.
Do heated chips really not suffer from hysteresis? If they do, it will be worse than non-heated chips, because the heating will cause them to go through more temperature cycling at turn-on/switch-off.
--- End quote ---
Hi
If the heated chip is powered up during the temperature cycle, the die sees much less "delta T" during the cycle. The chip does indeed change the amount of power into the heater. That change *does* have an impact. It is much less than the impact of a cycle on an un-heated part. Indeed the ideal case would be a heated part inside a heated enclosure. That has it's problems as well ....
Bob
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