Precision 5V reference

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prescott2006

New Member

• Nov 14, 2010

• #1

Anyone can suggest a very precise and constant 5V reference? I Google and see many are recommend LT1085 and LM317? Which one is better? Any better recommendation?

 

Roff

Well-Known Member

• Nov 14, 2010

• #2

prescott2006 said:

Anyone can suggest a very precise and constant 5V reference? I Google and see many are recommend LT1085 and LM317? Which one is better? Any better recommendation?

Click to expand...

Those are adjustable voltage regulators, meant to supply significant current to a load while maintaining a very stable output voltage as supply voltage, load and temperature changes.
A reference is precise, and extremely stable with temperature. They are not meant to be used as a power supply regulator. Which do you want?

 

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prescott2006

New Member

• Nov 14, 2010

• #3

I wish to have a precise 5V source in my circuit. So what IC is best in this case?

 

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KeepItSimpleStupid

Well-Known Member

Most Helpful Member

• Nov 14, 2010

• #4

Here is an example of a 5V reference IC: https://www.electro-tech-online.com/custompdfs/2010/11/MAX675.pdf

 

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prescott2006

New Member

• Nov 14, 2010

• #5

SO, with MAX675, if I supply let say 12 V, I will get a very precise 5V ?

 

MikeMl

Well-Known Member

Most Helpful Member

• Nov 14, 2010

• #6

Poke around on this page:

 

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KeepItSimpleStupid

Well-Known Member

Most Helpful Member

• Nov 14, 2010

• #7

Or this page.

 

Last edited: Nov 14, 2010

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prescott2006

New Member

• Nov 14, 2010

• #8

OK. Thanks. How about precision resistor, any recommendation? Which brand is more reliable?

 

Noggin

Member

• Nov 15, 2010

• #9

Just about any brand is as reliable as the next, just look at the specs. How precise do you need it? 1%? 0.1%? 0.05%?

 

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KeepItSimpleStupid

Well-Known Member

Most Helpful Member

• Nov 18, 2010

• #10

Digi-key unless you want to buy in bags of 100.