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Part Number: LM2903-Q1
I noticed the following description on LM2903-Q1's VICR - Common-mode input voltage range in the version H of the data sheet (SLCS141H).
It implies the inverting and the non-inverting inputs of the LM2903-Q1 are asymmetric. Is it correct?
If they were symmetric in terms of input structure, the description would be, "The upper end of the common-mode voltage range is VCC - 1.5 V for one input, and the other input can exceed the VCC level; the comparator provides a proper output state."
Best regards, Shinichi Yokota
A problem with some amplifiers is output inversion when outside the acceptable common mode range. I believe it's that same effect that this comparator is speaking about.
The note explicitly states "the comparator provides a proper output state" under the conditions. The note isn't about device protection but about the acceptable Common-mode input voltage range, VICR.
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Please see section 2.5 of the LM339 family application note:
The input voltage range applies to *each* input. As long as one input is within the valid input voltage range, the output will be correct.
"Common mode" is not really a correct term for comparators since the inputs are rarely kept at equal potentials. The limit must be applied to *each* input independently.
Regards,Paul GroheTI Comparators (LAMPS-CMPS) Applications Group
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