Hi, Sougata
Thanks for the XLS sheet ...
TL431 is to consider like a Zener diode ... noise involved !!!
I always use a solid aluminium 10µF cap ( Alusol C 122 ) or tantalum cap ...
With a good 4.5 digits multimeter for trimming - and quality components - ... performance is to compare to MAX or AD best voltage refs ...
Not so bad, for such an oldie !!!
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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