Lpc2000

Why the VREF pin in LPC parts accept sush a narrow range ? 2.5 ->VDDA ?
I'd like to use an external reference of 2.048V but as far as I can see 
I'll have to use an external A/D converter.
So I need a 10..12bits, low pin count, low power, LOW COST A/D .... Ideias ?

Thanks.

Hi, Mauricio!

One important requirement missing: speed?

I am using 16 bit AD7715, lowest cost "per-bit" so far for low-rate 
differential input conversions.

Marko



Mauricio Scaff wrote:

> Why the VREF pin in LPC parts accept sush a narrow range ? 2.5 ->VDDA ?
> I'd like to use an external reference of 2.048V but as far as I can see
> I'll have to use an external A/D converter.
> So I need a 10..12bits, low pin count, low power, LOW COST A/D .... 
> Ideias ?
>
> Thanks.
>
>
>
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Speed ???? 10SPS is fast.

 Mauricio



Marko Pavlin (home) wrote:
> Hi, Mauricio!
>
> One important requirement missing: speed?
>
> I am using 16 bit AD7715, lowest cost "per-bit" so far for low-rate
> differential input conversions.
>
> Marko
>
>
>
> Mauricio Scaff wrote:
>
> > Why the VREF pin in LPC parts accept sush a narrow range ? 2.5 ->VDDA ?
> > I'd like to use an external reference of 2.048V but as far as I can see
> > I'll have to use an external A/D converter.
> > So I need a 10..12bits, low pin count, low power, LOW COST A/D ....
> > Ideias ?
> >
> > Thanks.
> >
> >
> >
> > SPONSORED LINKS
> > Microprocessor
> > 
> <http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC-J9hJ5qyXg0WPR0l6g 
> <http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC-J9hJ5qyXg0WPR0l6g>> 
>
> >       Microcontrollers
> > 
> <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq01nxwg 
> <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq01nxwg>> 
>
> >       Pic microcontrollers
> > 
> <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c6LyBvUqVQ 
> <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c6LyBvUqVQ>> 
>
> >
> > 8051 microprocessor
> > 
> <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVIlekkDP-A 
> <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVIlekkDP-A>> 
>
> >
> >
> >
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