Reading datasheets to pick a comparator

  • #1
akaliuseheal
55
8
Hello,
I've got a voltage comparator, well only on schematics, I need to chose one and I need some help interpreting datasheet. The datasheet I was looking at is of a lm393. My input voltage ranges from -7.8V to +7.8V. The datasheet says -0.3 to something. So it's not usable, right?
I was also looking at lm111 and here it is stated that input voltage can be from -15V to +15V which is great but I can't find information about output sink current.
 

Answers and Replies

  • #2
jim hardy
Science Advisor
Gold Member
Dearly Missed
9,847
4,891
The datasheet says -0.3 to something. So it's not usable, right?

You need to spend some time reading datasheets to learn the vocabulary.
The limitation is input voltage should lie between the power supply "rails"

That comparator can handle a dual supply of +&- 15 volts.
so you +&- 7.8 is well within that range.
You just have to give the comparatpr a +&- supply.
upload_2018-9-15_15-37-5.png
 

Attachments

  • upload_2018-9-15_15-37-5.png
    upload_2018-9-15_15-37-5.png
    8.9 KB · Views: 382
Last edited:
  • Like
Likes akaliuseheal and berkeman
  • #3
berkeman
Mentor
62,893
13,782
I've got a voltage comparator, well only on schematics, I need to chose one and I need some help interpreting datasheet.
Can you Upload the schematic? Use the Upload button in the Edit window to Upload a PDF or JPEG copy. That will help us a lot in suggesting things for you to look for as you pick the comparator IC to us. Thanks. :smile:
 

Suggested for: Reading datasheets to pick a comparator

Replies
2
Views
2K
  • Last Post
Replies
20
Views
3K
  • Last Post
Replies
4
Views
5K
Replies
3
Views
4K
Replies
3
Views
3K
Replies
17
Views
40K
Replies
4
Views
2K
Replies
3
Views
8K
Replies
1
Views
10K
  • Last Post
Replies
4
Views
4K
Top