EEVblog Electronics Community Forum

Electronics => Projects, Designs, and Technical Stuff => Topic started by: old gregg on August 28, 2014, 07:26:48 pm

Title: R2R self-contained DAC
Post by: old gregg on August 28, 2014, 07:26:48 pm
Hi,

i'm looking for a self contained R2R dac, something easy to manipulate with just the necessary pin connection. I don't want internal management with CS or DACLOAD and so on...just the stupid passive DIP8 or SIL8 R2R ladder.

i've try to find it on serveral manufacters websites but I always end up with more complext chip that I don't want. I've managed to find a bourns references but not really easy to get.

Do you have any references to give ? if a buffer is included nice, otherwise is not a big deal.

thank you.

Title: Re: R2R self-contained DAC
Post by: German_EE on August 28, 2014, 07:29:51 pm
http://www.mouser.de/Passive-Components/Resistors/Resistor-Networks-Arrays/_/N-e89l?Keyword=R2R&FS=True (http://www.mouser.de/Passive-Components/Resistors/Resistor-Networks-Arrays/_/N-e89l?Keyword=R2R&FS=True)

Easy  :)
Title: Re: R2R self-contained DAC
Post by: Andreas on August 28, 2014, 09:06:03 pm
Hello,

you can use a AD7524 (grounding the CS and WR  lines).

With best regards

Andreas
Title: Re: R2R self-contained DAC
Post by: casinada on August 28, 2014, 09:26:52 pm
This video from Alan "w2aew" might be of interest to you
https://www.youtube.com/watch?v=6CbxrLMKdS4&list=UUiqd3GLTluk2s_IBt7p_LjA (https://www.youtube.com/watch?v=6CbxrLMKdS4&list=UUiqd3GLTluk2s_IBt7p_LjA)  ;)
Title: Re: R2R self-contained DAC
Post by: Alex Eisenhut on August 28, 2014, 09:42:14 pm
They still make the DAC1408?
Title: Re: R2R self-contained DAC
Post by: w2aew on August 29, 2014, 01:31:19 am
Quote from: casinada on August 28, 2014, 09:26:52 pm
This video from Alan "w2aew" might be of interest to you
https://www.youtube.com/watch?v=6CbxrLMKdS4&list=UUiqd3GLTluk2s_IBt7p_LjA (https://www.youtube.com/watch?v=6CbxrLMKdS4&list=UUiqd3GLTluk2s_IBt7p_LjA)  ;)

Bourns still make R2R networks. I bought some from a few months ago. I used them on another XY oscilloscope graphics mini-project. It makes an appearance in this video:

https://www.youtube.com/watch?v=6CbxrLMKdS4 (https://www.youtube.com/watch?v=6CbxrLMKdS4)
Title: Re: R2R self-contained DAC
Post by: Bored@Work on August 29, 2014, 05:20:21 am
Quote from: Alex Eisenhut on August 28, 2014, 09:42:14 pm
They still make the DAC1408?

I knew the discussion would sooner or later come to these dinosaurs  :). I don't think they make the MC1408 any more, but you can still get the DAC0808 (direct replacement) and its dinosaur cousins like the DAC08, DAC0800, etc.
Title: Re: R2R self-contained DAC
Post by: dannyf on August 29, 2014, 01:44:31 pm
Quote
just the stupid passive DIP8 or SIL8 R2R ladder.

There are ready-made r2r networks (not of high precision); and you can also make them yourself.

There are also onboard DACs (in a mcu) or digital pots...

The choices are endless.