Looking for a cheap >800ksps 16-bit D/A

Depends what you mean by crazy

is claimed to be $12 for 1k quantities, offering 750k sample/sec. for $12.66 you can go up to 1.25M samples/sec with the

The Analog Devices part

is $20 in 100-up qunatities, but it is sigma-delta.

is SAR, but only costs $12.72 100-up.

Bill, I need a D/A. You listed A/D converters only.

SioL

If you want cheap then you dont need 16 bits. It's very unlikely you need 16 bits anyway and even more unlikely you'll get it even if you were prepared to pay. 12 bits is the realistic limit for low cost options.

Some of the audio ones come close to your stated requirements.

Best regards, Spehro Pefhany

TI's DAC8541 is about $3 in quantity. Ole reliable PCM56 is cheap, bipolar, internal ref, available in DIP, and is actually pretty good at DC.

Both serial, of course.

John

Oops. A senile moment ... meanwhile, how is this for $16 in small quantities (from Digikey)

Analog Devices have a couple of comparable parts

at comparable prioces.

Hello Spehro,

SioL might consider using these in staggered fashion to achieve the required sample rate. I did this a lot with ADCs.

DAC8541 is way too slow, at 10uS settling time. PCM56 is much better at 1.5uS, but still too slow for 800ksps.

That's what I'm looking for :)

SioL

sample rate. I did this a lot with ADCs.

Hmm, using another D/A to provide ref. voltage for the first D/A?

SioL

It happens :)

This one looks good. I thought there might be something cheaper out there. I guess I'll have to adjust my target price a bit higher.

Help appreciated!

SioL

Hello SioL,

sample rate. I did this a lot with ADCs.

That won't likely become accurate enough. I was thinking of using several slower audio DACs and then having them feed an output node in a round robin fashion through a "chopper". I usually had to do this the other way around, using ADCs that were too slow for the application and then ganging several. This is much more difficult than DAC ganging because I had to auto-align gain, offset and clock phase. The latter is the tough one but in your DAC application you might not have to worry much about it.

slower audio DACs and then having them feed an output

the other way around, using ADCs that were too slow

DAC ganging because I had to auto-align gain,

application you might not have to worry much about it.

Hey, thanks, that's an interesting idea indeed, could save ~4-5 US$ I'll see how I fare with PCB real estate.

SioL