Precision 5V reference

[prescott2006]

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?

 

[(*steve*)]

Define precise (over input voltage, time, load, and temperature?) Is noise a consideration?

The LM317 isn't a precision regulator.

Do you really want a 5V reference, or a 5V supply? (i.e. what current are you needing)?

 

[prescott2006]

I want to have a constant 5V source in my circuit. Like I supply 12 V, then I will get a very precise 5V voltage. Precise in term of the 5V will as constant as possible no matter how is the load and the fluctuation of the input voltage.

 

[(*steve*)]

OK, sounds like you simply need a regulator.

Google 7805

 

[prescott2006]

But is it 7805 output reliable? Won't it fluctuate too much from 5V?

 

[(*steve*)]

You have yet to define what limits you have.

From your explanation it sounds like all you need is a 5V regulator.

If it's any more complex we need details.

"As constant as possible" is NOT sufficient (it is pretty meaningless)

Have a look at the datasheet for the 7805 and tell us if there are any of its specs that fall outside your required parameters, and by how much.

 

[bean]

http://blog.sina.com.cn/u/1878134175

Maybe you can find what you want.

 

[barathbushan]

url removed

Maybe you can find what you want.

That's link is not really helpful