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Hi Team,
my customer is using LM2901 as comparator,
they wanted to set Vref=0.3 V , and if V+ higher than Vref than output will act as 1(high level) , V+ lower than Vref than output will act as 0(low level) , the Vin level will be 0~2V (analog input), Vsup will set as 3.3V.
just for quick check , above application is doable and correct is that right?
(the Vin might higher than VICR= 3.3-2=1.3V, but the Vref is been set as 0.3V , which is lower than VICR , so the device will act as customer require per check by d/s 9.2.2.1 . )
do let me know if there's any concern of this application, thanks!
Andy
Hi Andy,
You can use the configuration you describe as above, but please be mindful that when your In+ node is above the spec, the output will still function properly at output high, but when it crosses the threshold to transition low, there may be some delay. You can read more about that in section 2.2 & 2.3 in the appnote below.
https://www.ti.com/lit/an/snoaa35/snoaa35.pdf
Thanks,
Sally
Hi Andy,
Also, we don't recommend having a cap at the output. This cap will slow your output response, will look like a short to GND for fast signals, etc.
Thanks,
Sally
Sally ,
thanks for feedback, if wanted to avoid the delay when transition low, the best way to do is to set Vsup higher than 1.5V+2V(Vin(max))=3.5V , to make the both V+,V- input range are within common mode VICR , is that correct?
Andy
Thanks Kai for answering.
Andy
At this time it appears that your question has been answered. If you have any additional questions, feel free to reply and the thread will remain opened.
Chuck