Recommendation for Digital to Analog Converter

[Yimin Rong]

I've been searching without success for a couple of days for a DAC
with these characteristics:

* 5V operation
* DIP - 20 pins or so
* 8-bit resolution
* Voltage output
* Two reference voltages - output is linearly scaled such that [0,
255] -> [VLo, VHi]
* 1+ Msps

Don't need dual or quad, and serial interface won't work because the
microcontroller isn't fast enough to run that way.

Can anyone make any recommendations? Or is there a website that helps
you select ICs based on requirements?

Regards,

Yimin

 

[Lostgallifreyan]

Yimin Rong <yiminrong@yahoo.ca> wrote in
news:1191673734.222940.62860@k79g2000hse.googlegroups.com:

Or is there a website that helps
you select ICs based on requirements?

Digikey's part selection process might get you some of the way there.

 

[Jamie]

Yimin Rong wrote:

I've been searching without success for a couple of days for a DAC
with these characteristics:

* 5V operation
* DIP - 20 pins or so
* 8-bit resolution
* Voltage output
* Two reference voltages - output is linearly scaled such that [0,
255] -> [VLo, VHi]
* 1+ Msps

Don't need dual or quad, and serial interface won't work because the
microcontroller isn't fast enough to run that way.

Can anyone make any recommendations? Or is there a website that helps
you select ICs based on requirements?

Regards,

Yimin

If you are using a micro, can't you program a couple of output

lines for PWM to be ran through a unity gain for buffering ?
That is what we do with AVR's and Pic's.
In the case where you have a uC that does not have a direct
hardware programmable event for PWM out put, you could set up an
NMI sub, to generate the output for you. this also works very
good.
You could do this with one line output also at 50% duty cycle
to generate a 0.00v offsets with a +/- source with respect to common.

The resolution is as good as the timer you're using.


--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

 

[Yimin Rong]

On Oct 6, 12:17 pm, Lostgallifreyan <no-...@nowhere.net> wrote:

Yimin Rong <yiminr...@yahoo.ca> wrote innews:1191673734.222940.62860@k79g2000hse.googlegroups.com:

Or is there a website that helps
you select ICs based on requirements?

Digikey's part selection process might get you some of the way there.

Thank you, I'm looking at the page now. Regards, Yimin

 

[Yimin Rong]

On Oct 6, 1:48 pm, Jamie
<jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote:

Yimin Rong wrote:
I've been searching without success for a couple of days for a DAC
with these characteristics:

* 5V operation
* DIP - 20 pins or so
* 8-bit resolution
* Voltage output
* Two reference voltages - output is linearly scaled such that [0,
255] -> [VLo, VHi]
* 1+ Msps

Don't need dual or quad, and serial interface won't work because the
microcontroller isn't fast enough to run that way.

Can anyone make any recommendations? Or is there a website that helps
you select ICs based on requirements?

Regards,

Yimin

If you are using a micro, can't you program a couple of output
lines for PWM to be ran through a unity gain for buffering ?
That is what we do with AVR's and Pic's.
In the case where you have a uC that does not have a direct
hardware programmable event for PWM out put, you could set up an
NMI sub, to generate the output for you. this also works very
good.
You could do this with one line output also at 50% duty cycle
to generate a 0.00v offsets with a +/- source with respect to common.

The resolution is as good as the timer you're using.

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.http://webpages.charter.net/jamie_5

Thanks for the advice. The PWMs output at a few KHz whereas I need MHz
fequency, so I don't think I can use them. Regards, Yimin