op amp input offset voltage

MacIntoshCZ

Active Member

• Mar 18, 2021

• #1

Hello, i want to sense at least 10mA on 0,01R -> 100uV
So i need to choose max input offset 100uV.
Why mouser display typical /average?/ offset from filter settings lower or equal to 100uV?
For instance lm321

 

Last edited: Mar 18, 2021

MacIntoshCZ

Active Member

• Mar 18, 2021

• #2

I have selected this op amp for its purpose

https://cz.mouser.com/datasheet/2/268/MCP6V96_Family_Data_Sheet_DS20006467A-1948680.pdf

 

crutschow

Well-Known Member

Most Helpful Member

• Mar 18, 2021

• #3

MacIntoshCZ said:

I have selected this op amp for its purpose

https://cz.mouser.com/datasheet/2/268/MCP6V96_Family_Data_Sheet_DS20006467A-1948680.pdf

Click to expand...

I don't understand the question in your first post, but the selected op amp should meet your requirements.
It uses an auto-zero technique to eliminate virtually all input offset.

 

MacIntoshCZ

Active Member

• Mar 18, 2021

• #4

Sorry it was silly question. I just select in filter Vos lower than 100uV, but mouser shows op amps with Vos_max higher than needed ,which is unusable i gues.

 

throbscottle

Well-Known Member

• Mar 20, 2021

• #5

Some of those parametric selection tools are pretty dumb. I thought Mouser's one was ok though. I think it comes down to some manufacturers quoting maximum values in their general description, and others quote typical..