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IC bandwidth
Does Ic bandwidth matter for our detectors? I was about to order spare/replacement IC and notice there is a wide range of bandwidth for the same IC is higher better, Like the LM358 you can get it in 700khz or 1Mhz, also with the 393....... same question about MA (milamp, are we better getting the highest or does it not matter?
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Depends on what detector and where in the circuit the opamp is used. -
It matters, that's why so many different opamps are made. Generally, the RX preamp needs a high gain-bandwidth (GBW) product. Others might or might not.
"mA" can mean the current consumption of the opamp, or the max output current rating.Comment
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Lower Band Width OP may work fine in the Audio Realm but NO SO in the Digital . Wider BW is required to keep square waves square. LOL Infinite number of Harmonics stuff.Comment
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Yes indeed "mA" , I meant the output, in short! your saying, yes get fastest bandwidth as more is better then not enough OR you meant part of the detector as you said RX need to be faster and others slower? or simply use that faster and call it a day ? Same for the biggest mA output? better mA out, also for the same reason, As I'm sure you already know, there is only about 50 cent's between the lowest and the highest. Thanks Carl.Originally posted by Carl-NC View PostComment
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Lol, A square, square is better then a slanted square that's not a square but a rhombus, Say that 5 times really fast.Originally posted by homefire View Post
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My reply was "in general." If you are replacing an opamp and you don't know anything about opamps, replace it with the same part number. If the part number has different grades, get the best grade.Comment
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Thanks, That is good advice. I have a basic understanding of what opamps do, however, why one is used, over another, I am very much clueless. the bandwidth question, was also to help me understand why one detector with the same circuit and similar components preforms better then another. like homefire said, if a faster ic keeps everything square with a cleaner signal = better detection ?Originally posted by Carl-NC View PostComment
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LOL yep, it can happen that way but in the same sense a Poor performing Op Amp may not produce unwanted side bands that the "" Better Option "" would be able to. That's why they don't just make the Best. Best at What ? Best for What ? Best / Better is a Relative thing. Price has little to do with this one.Comment
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Would you happen to know what the last two or 3 letters mean on the ic's like N, CP, AB .......... they must mean something to describe a important or a bit of info?Originally posted by homefire View PostComment
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These letters typically indicate the IC package and temperature range.Originally posted by Tibuck19 View Post
The suffix meaning can vary among makers. So best to consult the data sheet from the maker. This will be in the data sheet under ordering info.
'N' is typically a plastic DIP.Comment
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Ok thanks, I thought it was more of a standard way of quickly identifying ic properties without having to going throw datasheet of each chip in the same function.Originally posted by waltr View PostComment
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Before I asked about bandwidth, was in part after noticing the SMD chip had a fast bandwidth availability then its throw hole counter part! while digging throw the old post I had came across this one, I was wondering if it worth the trouble just to get the 1 MHz faster.
http://www.geotech1.com/forums/showt...like-this-ideaComment
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It DEPENDS on what function in the Detector circuit it will be used for.Originally posted by Tibuck19 View Post
Sometimes a faster op-amp will just cause a headache when it oscillates.
Other times it may do good things.Comment
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