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Originally Posted by magical hands
Yeah but what i heard is you need to place a 20 Ohms or 500 ohms resistor to filter the noise. I don't know anything about it and I heard people saying that so I was just wondering if it is necessary to place the resistor and if yes than where? Thanks guys for your reply   |
Have you read the data sheet?
http://www2.usfirst.org/2005comp/Specs/gths1.pdf
Obviously someone you trust has told you they are necessary, or you wouldn't still be questioning it after 2 people have said they aren't necessary in this thread. You could ask these people to fight to the death, and use the winner's suggestion, however I don't think that is likely.
Just asking if they are necessary isn't likely to help you make up your mind any better then you already have. A better question would be to ask what type of analysis did people do to decide that they were or were not necessary. From there you can make your decision on which argument seems more complete.
For the record, it can be just as necessary to filter a digital signal as an analog signal, particularly a high speed one.
You don't need to prototype everything, just the stuff you want to work. - JVN [more] 
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