[volt-nuts] ADA4522

[acbern at gmx.de]

not sure the TI filter circuitry, although very nice, is stable with the ADA4522. 
have not checked, but R2/C2 loop stabilizer may not work with ad4522.
would require analysis/test, but positive result would sure make this a great reference buffer amp.
if you do, would be nice if you let the group know.



> Gesendet: Samstag, 09. April 2016 um 00:38 Uhr
> Von: "Randy Evans" <randyevans2688 at gmail.com>
> An: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Betreff: Re: [volt-nuts] ADA4522
>
> 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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