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'[PIC]using pic's 12 i/o and r2r net, as DAC'
2006\01\05@233929 by rosoftwarecontrol

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part 1 169 bytes content-type:text/plain; (decoded quoted-printable)

I am thinking about: using pic's 12 i/o and r2r net, as DAC, with op as
buffer.
is this way acceptible? any example?





part 2 35 bytes content-type:text/plain; charset="us-ascii"
(decoded 7bit)

2006\01\05@235729 by Bob Blick

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On 5 Jan 2006 at 22:43, microsoftwarecontrol wrote:

> I am thinking about:
> using pic's 12 i/o and r2r net, as DAC, with op as
> buffer.
>
> is this way acceptible? any example?

Do not expect 12 bit accuracy. A real 8 bit DAC will probably be
more accurate.

Cheerful regards,

Bob

2006\01\06@004310 by Jinx

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> > is this way acceptible? any example?

http://www.avr-asm-tutorial.net/avr_en/AVR_DAC.html

The problem is the resistor tolerance and matching. Save
yourself a lot of work and buy a proper 12-bit DAC

2006\01\06@012049 by Spehro Pefhany

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At 10:43 PM 1/5/2006 -0500, you wrote:
>I am thinking about:
>using pic's 12 i/o and r2r net, as DAC, with op as
>buffer.
>
>is this way acceptible? any example?

Yes, you can do this. With 0.1% resistors you can approach 11-12-bit accuracy
*typically*, but you'll need a decent buffer on the output. Don't expect it
to be monotonic.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
->> Inexpensive test equipment & parts http://search.ebay.com/_W0QQsassZspeff


2006\01\08@184132 by andrew kelley
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On 1/6/06, Spehro Pefhany <.....speffKILLspamspam@spam@interlog.com> wrote:
> At 10:43 PM 1/5/2006 -0500, you wrote:
> >I am thinking about:
> >using pic's 12 i/o and r2r net, as DAC, with op as
> >buffer.

Order a maxim <shiver> sample.. Good analog chips, sometimes sourcing
problems.. but for a one-off, just get a sample.. or get a microchip
DAC sample.

andrew

2006\01\08@184825 by Marc Nicholas

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Maybe he is more interested in the learning aspect? Building ladder networks
can be educational, after all.

I've got a homebrew VGA adapter built with an FPGA and 3 resistors for each
colour channel....works remarkably well.

-marc


On 1/8/06, andrew kelley <leetslackerspamKILLspamgmail.com> wrote:
{Quote hidden}

> -

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