I2S and digital signal path - in-line resistors? - Page 7 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th November 2012, 07:38 AM   #61
Account disabled at member's request
 
Join Date: Aug 2007
Hi,

The 384Khz dual ad1955 DAC arrived. I am pleasantly surprised ! The underside has decent ground planes. It isn't great quality but it is much better than the usual Taobao junk from mainland China. Depth and detail are impressive. I'll let it settle in for a few days and then start a thread about it.

Click the image to open in full size.
  Reply With Quote
Old 29th September 2013, 08:56 AM   #62
diyAudio Member
 
Join Date: Dec 2009
Hi guys,
Hope you guys show some interest in the project below and may like to contribute to the project in which they are designing an AUDIO Motherboard.

Music Main board for diyer
Music Main board for diyer
  Reply With Quote
Old 30th March 2015, 09:15 AM   #63
diyAudio Member
 
Join Date: Sep 2011
Quote:
Originally Posted by marce View Post
Its not going to have to high a data rate, so I would worry to much on that score. If the waves look OK (dont forget to take into account your scope probe loading) then I wouldn't worry.
Series resistors are there to match the signal to the layout topography, so there is realy no off the shelf value, it depend on the layout topography andf impedance, there are only two ways to determine the value:
Simulate the design using signal integrity tools and choose the best value, or try different values and see which gives the best measured result. Attached are some screen shots showing the actual difference different values of series resistors make, in this case 82R was chosen.
Vias and Kinks in traces will have no noticable effect on signal integrity at frequencies and rise time the DIYer is gonna be playing with, but with good layout you can minimise the number of layer changes a signal has between A & B.
My main concern would be a two layer board, these days ALL digital designs should be 4 layers min, with a full contigous ground plane. The main problem these days is signal rise time, which are forever getting faster and faster, and ultimetly it is the rise time of a signal (suignals) that determine whether a design is high speed.
Yes ground pour help if they are done correctly and are a must for two layer digital boards, but they need lots of stiching vias to be of any use.
what software is this, this simulating the trace. thanks
  Reply With Quote
Old 30th March 2015, 09:32 AM   #64
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
CADSTAR Signal Integrity Verify
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
what resistors are in the aikido signal path jarthel Tubes / Valves 10 29th June 2006 07:33 AM
Relays in digital signal path Prune Digital Source 23 2nd July 2004 06:08 PM


New To Site? Need Help?

All times are GMT. The time now is 10:33 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2