High Resolution DAC

Do you have a question? Post it now! No Registration Necessary

Threaded View
Oliver Dial Contact options for registered users 's Avatar (by Gravatar) posted on
December 18, 2006, 7:41 pm
rate this thread
Reply to this post Reply Tag this thread to save it in your account Save


Hi!  I'm looking for a high resolution (ideally 24 bit) DAC to use in a
low drift DC voltage source.  I don't believe a sigma-delta converter
is appropriate for this job (although perhaps someone could convince me
otherwise).  Does anyone have any suggestions?  I've checked with my
usual suspects (Analog, TI/Burr-Brown, Maxim), and haven't seen
anything that looks appropriate.


Other Related Threads
Marc Guardiani Contact options for registered users 's Avatar (by Gravatar) posted on
December 20, 2006, 4:23 pm
Permalink
Reply to this post Reply Tag this thread to save it in your account Save
Re: High Resolution DAC


Quoted text here. Click to load it

I don't think you're going to find anything but sigma-delta ADCs at
this resolution (for any sort of reasonable price anyway). Look at ADI
again. They have 24-bit ADCs made for measuring DC all the way up to
multi-megahertz sampling ones.

Marc


Other Related Threads
Marc Guardiani Contact options for registered users 's Avatar (by Gravatar) posted on
December 20, 2006, 4:26 pm
Permalink
Reply to this post Reply Tag this thread to save it in your account Save
Re: High Resolution DAC


Quoted text here. Click to load it
but sigma-delta ADCs at
Quoted text here. Click to load it

My bad... I read the original post too fast and took DAC for ADC. ADI
probably still has what you're looking for, but I am less familiar with
their DAC offerings.

Mea culpa,
Marc


Jon Elson Contact options for registered users 's Avatar (by Gravatar) posted on
January 5, 2007, 9:59 pm
Permalink
Reply to this post Reply Tag this thread to save it in your account Save
Re: High Resolution DAC




Oliver Dial wrote:

Quoted text here. Click to load it
This is 1 part in 16.7 million!  Do you actually need that resolution, or
that accuracy?  If you need the accuracy, then you are going to find this
assignment real difficult.  Everything in the main signal chain is going
to have to be stable to that level.  If this were a 10 V max power supply,
then the output would have to be stable, or accurate, to half of a
microvolt!
You won't even be able to breath on the thing without inducing
thermoelectric
voltages that swamp that by an order of magnitude.

Jon


Site Timeline