Making a DAC, you better have an idea of what's the target market for it
before even trying to make one. Considering all the one on the market I
would probably say the only interesting reason to make one is if you are
doing an asic and you need a DAC inside for some custom purpose. Else
buy one it's way cheaper and easier.
On 2012-11-03 20:18, Timothy Normand Miller wrote:
An open source DAC is a worthy project. And there is demand for DACs.
But can we make it a commodity prices? I think we'd have to do a
full custom and make millions of them to make it cost-effective.
On Sat, Nov 3, 2012 at 6:17 PM, Troy Benjegerdes <[email protected]
<mailto:[email protected]>> wrote:
I'd rather design an open-source high-speed DAC silicon where
you have control over all the transistors and can just make
resistors exactly how you want them in silicon, instead of
trying to deal with the unknown black box of driver stuff
that's inside a digital I/O pins.
If someone will commit to buying a lot of.. I don't know,
10,000 DACs, then I can start working backwards from that
and tell you how much they will cost and when you can expect
to get them.
What interface do you want on the digital side? I was thinking
a Gigabit ethernet DAC would be a pretty cool toy. ;)
On Sat, Nov 03, 2012 at 09:17:41PM +0000, Jack Carroll wrote:
> To make a parallel DAC that's monotonic and doesn't have
oversize steps at the major bit carries, you need switches that
introduce very small voltage errors (less than 1/2 LSB worth of
voltage at the MSB carry) or else errors that are reproducible
within 1/2 LSB from bit to bit. Generic output pins from logic
chips don't do that. I've done some designs of fast parallel DACs
with R/2R ladders and variant architectures, and getting the right
switches and a stable reference rail is the biggest challenge.
Doing it at a high update rate just makes everything tougher, and
building it out of separate switch chips and resistor arrays just
makes everything harder, because the physical size of the PCB
interconnects between components adds stray inductances and
capacitances. If you can buy the DACs and line drivers, it's a
lot easier.
>
> Jack Carroll
>
> ----- Original Message -----
> From: "Timothy Normand Miller" <[email protected]
<mailto:[email protected]>>
> To: "Ing. Daniel Rozsny??" <[email protected]
<mailto:[email protected]>>
> Cc: [email protected] <mailto:[email protected]>
> Sent: Wednesday, October 31, 2012 9:48:35 AM
> Subject: Re: [Open-graphics] The next OGA card?
>
>
>
> Actually, if we have lots of I/Os to spare, we might be able to do
> analog video using a resistor network and a low-pass filter.
Someone
> with a better EE background could answer that.
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--
Timothy Normand Miller, PhD
Assistant Professor of Computer Science, Binghamton University
http://www.cs.binghamton.edu/~millerti/
<http://www.cse.ohio-state.edu/%7Emillerti>
Open Graphics Project
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