electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
go to the radio page Live at electro-music.com radio 1 Please visit the chat
poster
 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
Matched resistors for DAC
Post new topic   Reply to topic Moderators: State Machine
Page 1 of 1 [4 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
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
Back to top
View user's profile Send private message
bubzy



Joined: Oct 27, 2010
Posts: 594
Location: United Kingdom
Audio files: 64

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
_________________
_Richard_ Smile
Back to top
View user's profile Send private message
-minus-



Joined: Oct 26, 2008
Posts: 787

Audio files: 13

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.
Back to top
View user's profile Send private message
bubzy



Joined: Oct 27, 2010
Posts: 594
Location: United Kingdom
Audio files: 64

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

_________________
_Richard_ Smile
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: State Machine
Page 1 of 1 [4 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use