[volt-nuts] ADA4522

Randy Evans randyevans2688 at gmail.com
Fri Apr 8 18:38:26 EDT 2016


I would use a filter such as TI's SBVA010 app note, "Improved Voltage
reference Filter has Several Advanatages" or the article by Walt Jung,
"Build an Ultra-Low Noise Voltage Reference" in Electronic Design.

On Fri, Apr 8, 2016 at 1:02 AM, <acbern at gmx.de> wrote:

> Low frequency noise is very good, but is is high noise at about 800kHz
> (chopper) and above (possible artifacts). That should be filtered,
> depending on your application.
> What did you foresee to get rid of it, or would you accept it? Simple RC
> filter as indicated in the manual increases the output resistance.
>
>
>
>
> > Gesendet: Freitag, 08. April 2016 um 03:35 Uhr
> > Von: "Randy Evans" <randyevans2688 at gmail.com>
> > An: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> > Betreff: Re: [volt-nuts] ADA4522
> >
> > Sure, all good applications.  I am thinking of using it as an output
> filter
> > for a 10V reference to filter all noise above 10Hz,
> >
> > On Thu, Apr 7, 2016 at 6:27 PM, Daniel Mendes <dmendesf at gmail.com>
> wrote:
> >
> > > Ada4522-2 and 4522-4 are stocked at mouser. What about summing all
> outputs
> > > to reduce noise? Or use as buffered outputs with good reverse
> isolation...
> > >
> > > Daniel
> > > Em 07/04/2016 13:31, "Randy Evans" <randyevans2688 at gmail.com>
> escreveu:
> > >
> > > > Has anyone looked at the ADA4522 precision op amp from Analog
> Devices.
> > > It
> > > > looks very intriguing with it's extremely low offset voltage drift
> of 22
> > > > nV/°C maximum.  The offset voltage is as high as 5 uV but this could
> be
> > > > nulled out and it should be very stable over temperature after
> that.  It
> > > > could be a great choice for a voltage reference circuit.  Looks quite
> > > > inexpensive also, although AD only sell in tubes of 96 right now.
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