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 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
Matched resistors for DAC
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anders79



Joined: Jun 21, 2010
Posts: 21
Location: Sweden

PostPosted: Mon Mar 11, 2013 10:32 am    Post subject: Matched resistors for DAC Reply with quote  Mark this post and the followings unread

Hi!

Is 0.1% tolerance resistors without any additional trimmers or hand-matching, enough for building a 6-bit DAC?

Anders
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bubzy



Joined: Oct 27, 2010
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PostPosted: Thu Mar 14, 2013 1:55 am    Post subject: Reply with quote  Mark this post and the followings unread

should be fine, i would test them though and get them as close as possible. as you increase the resolution, the need for precision increases. best to give it a go and see how you get on Smile
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-minus-



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PostPosted: Fri Mar 15, 2013 11:35 am    Post subject: Reply with quote  Mark this post and the followings unread

0.1%? That seems a bit extreme. 1% would be plenty accurate, and I would not bother matching them either.

EDIT: I just realised this wasn't the Lunetta forum. Laughing As I have no experience in microcontrollers, you might want to check this.
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bubzy



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PostPosted: Mon Mar 18, 2013 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

there is a formula, and it should be 1/32 for 4 bits, 1/64 for 6 bits 1/256 for 8 bits, where the result of the sum is the accuracy of the resistor required. (its a percentage, so 0.01 as a result would be 1%)

http://en.wikipedia.org/wiki/Resistor_ladder explains a little more

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