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'Digital to ANALOG'
2005\04\22@103141 by Antonis Iliopoulos

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Dear all,

I know about analog to digital but how could you do DIGITAL to ANALOG?  Is there an internal function?

I would like to supply form the PIC another device with up to 3 volts with a resolution of 50mV is that possible?



Regards

Antonis





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2005\04\22@104655 by John J. McDonough

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----- Original Message -----
From: "Antonis Iliopoulos" <spam_OUTantonisiliTakeThisOuTspamyahoo.co.uk>
Subject: Digital to ANALOG


> I know about analog to digital but how could you do DIGITAL to ANALOG?  Is
there an internal function?

On some PICs, the A/D converter reference voltage can be provided on one of
the pins.  For example, the 16F88 has this capability.  However, the amount
of current available is quite low, and the available voltages are not
uniformly spaced, and there are only a few of them, so in general, this is
not a good A/D solution.  Still, in some cases it can do the trick.

A serial DAC is probably a better choice in most cases.  These are often
quite small, and are available in a wide range of resolutions and
configurations.  However, when you want to crank up the resolution the price
increases surprisingly quickly.  You aren't asking for much in the way of
resolution, so an inexpensive part ought to be able to do the job.  When you
need 12 or 16 bit resolution, be prepared to gasp when you see the price!

However, if you look at audio parts, rather than general purpose parts,
there are a few serial DACs intended for CD players and the like that are
reasonably priced with very good specs, so poke around a bit before plunking
down $20 on some fancy DAC.

--McD


2005\04\22@110131 by Mauricio Jancic

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Try taking a look at this:

www.piclist.com/techref/microchip/aout.htm
http://www.piclist.com/techref/microchip/d2a.htm

The first link is GREAT!

Mauricio Jancic
Janso Desarrollos - Microchip Consultants Program Member
.....infoKILLspamspam@spam@janso.com.ar
http://www.janso.com.ar
(54) 11 - 4542 - 3519


> {Original Message removed}

2005\04\22@110732 by ThePicMan

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At 10.46 2005.04.22 -0400, you wrote:
{Quote hidden}

I'm not sure these perform really well in the regard of DC, and this may
be a problem for certain microcontroller applications, like the one the
OP mentioned "supply power to another device".

For that it may be better to use a variable linear voltage regulator and
a digital potentiometer.


>--McD
>



2005\04\22@115254 by John J. McDonough

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----- Original Message -----
From: "ThePicMan" <.....thepicmanKILLspamspam.....infinito.it>
Subject: Re: Digital to ANALOG


> OP mentioned "supply power to another device".

Good catch.  I also totally blew by the possibilities of PWM, which I have
used in a pinch.  Again, though, you might need to pay attention to the DC
reference in OP's application

--McD


2005\04\22@123542 by Antonis Iliopoulos

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Thnks for the quick response.
I am looking for a 10 bit one so hopefully it is not going to be too expensive.

Antonis




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2005\04\22@123802 by Antonis Iliopoulos

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The lonks are briliant thanks a lot

Mauricio Jancic <EraseMEinfospam_OUTspamTakeThisOuTjanso.com.ar> wrote:Try taking a look at this:

www.piclist.com/techref/microchip/aout.htm
http://www.piclist.com/techref/microchip/d2a.htm

The first link is GREAT!

Mauricio Jancic
Janso Desarrollos - Microchip Consultants Program Member
infospamspam_OUTjanso.com.ar
http://www.janso.com.ar
(54) 11 - 4542 - 3519


> {Original Message removed}

2005\04\22@123803 by Antonis Iliopoulos

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The lonks are briliant thanks a lot

Mauricio Jancic <@spam@infoKILLspamspamjanso.com.ar> wrote:Try taking a look at this:

www.piclist.com/techref/microchip/aout.htm
http://www.piclist.com/techref/microchip/d2a.htm

The first link is GREAT!

Mauricio Jancic
Janso Desarrollos - Microchip Consultants Program Member
KILLspaminfoKILLspamspamjanso.com.ar
http://www.janso.com.ar
(54) 11 - 4542 - 3519


> {Original Message removed}

2005\04\25@020318 by vasile surducan

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On 4/22/05, Mauricio Jancic <RemoveMEinfoTakeThisOuTspamjanso.com.ar> wrote:
> Try taking a look at this:
>
> www.piclist.com/techref/microchip/aout.htm
> www.piclist.com/techref/microchip/d2a.htm
>
> The first link is GREAT!

  With the objection that will never meet the industrial
specifications for 4-20mA, which is minimum 1K load. With other words,
the operational amplifier supplied at  12-15V will never be able to
generate 4-20mA on 1K load. Else might be ok, even the liniarity of
this DA converter near 0V is very pour.

Vasile
http://surducan.netfirms.com

>
> Mauricio Jancic
> Janso Desarrollos - Microchip Consultants Program Member
> spamBeGoneinfospamBeGonespamjanso.com.ar
> http://www.janso.com.ar
> (54) 11 - 4542 - 3519
>
>
> > {Original Message removed}

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