[sdiy] A (slightly) better VRef?

[Oren Leavitt]

On 2/22/2012 4:03 AM, Justin Owen wrote:
> -----Original Message-----
> From: David G Dixon [dixon at mail.ubc.ca]
> Received: 21.02.2012 00:09:25
> To: 'Mattias Rickardsson'
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] A (slightly) better VRef?
>
>>>> I concur.  Use a REF02 or one of it's siblings for this application.
>
>>> Or something like a TL431 for a fraction of the price.
>
>> Absolutely.  Heck, even 78L0X is better than using the rails.
>
> OK, consider me warned :)
>
> So, for something like the REF02 are you using that as your central, stable VRef and runnning your other VRefs of of that? e.g. if you need a stable +3.5V and +1.25V and -1.25V - you'd create them from the stable +5V of the REF02?
>
> What then are you using to create those 'sub' VRefs?
>
> Thanks.

Sure thing Justin. You can use one reference IC and derive other "vrefs" 
using resistor dividers and op-amp buffers/inverters off of that.

Check out the app notes for REF-02 et-al for additional ideas.

- Oren