Electronics > Metrology

new voltage reference from MAXIM

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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:
************************snipp***********************************
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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