Re: [volt-nuts] ADA4522

2016-04-08 Thread Randy Evans 
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,  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" 
> > An: "Discussion of precise voltage measurement" 
> > 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 
> 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" 
> 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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Re: [volt-nuts] ADA4522

2016-04-08 Thread acbern 
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" 
> An: "Discussion of precise voltage measurement" 
> 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  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"  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.
> > > ___
> > > volt-nuts mailing list -- volt-nuts@febo.com
> > > To unsubscribe, go to
> > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> > > and follow the instructions there.
> > >
> > ___
> > volt-nuts mailing list -- volt-nuts@febo.com
> > To unsubscribe, go to
> > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> > and follow the instructions there.
> >
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>
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