LM211-Q1: How to calculate the input impedance of the comparator; Is the input voltage divided by the maximum bias current?

user5707026

Genius 3145 points

Part Number: LM211-Q1
Other Parts Discussed in Thread: LM311-N

How to calculate the input impedance of the comparator;
Is the input voltage divided by the maximum bias current?

Thanks

Elsa Duan

over 5 years ago

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Elsa,

as the "input bias current" also depends on "differential input voltage", thinking in terms of "input impedance" is no good approach.

Have a look at figure 13 of datasheet of LM311-N. I guess there's no relevant difference to the LM211-Q1, concerning the "input bias current" versus "differential input voltage" behaviour.

lm311-n.pdf

Kai

0 Chuck Sins over 5 years ago in reply to kai klaas69

TI__Mastermind 26120 points

Elsa

Kai's advice is very valid. Thanks Kai.

Chuck

0 Chuck Sins over 5 years ago in reply to Chuck Sins

TI__Mastermind 26120 points

Elsa

I have not seen any further inquiries on this post, so I will close the thread assuming your question has been answered.

If you need any additional information, feel free to reply or open a new thread.

Thanks

Chuck

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LM211-Q1: How to calculate the input impedance of the comparator; Is the input voltage divided by the maximum bias current?