Do you know of any appnote or the reference designdescribing the reduction of noise voltage reference?
MAX6341 have Noise 0.1Hz - 10Hz 2,4uVp-p, ´I would like to get the noise and the order below
You can always reduce noise with a low-pass filter, if you use a (low-pass corner frequency) « (min. unwanted noise frequency). The disadvantage: the reference voltage takes several of these respective time-constants to reach its final value.
I.e. with a simple RC filter with a corner frequency of - say - 0.01Hz , it will take several minutes to reach its final value. And you'll have to use low-noise (electrolytic) caps.
Nothing is simple.
RC LPF will be effective, resistance introduced into the circuit's own noise and mainly it will be a voltage drop. Therefore, you must add the output buffer.
And already we have a resistor, amplifier, everything travels with the temperature, the time and has an impact on the accuracy and stability of reference.
ARD444 has unfortunately 3x worse temperature drift and 1,6x worse long term stability.
I'm thinking about something like https://www.ti.com/lit/an/slyt355/slyt355.pdf
Unfortunately, it's hard to estimate what will be the long-term stability