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I2S and digital signal path - in-line resistors?
I2S and digital signal path - in-line resistors?
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Old 17th November 2012, 07:38 AM   #61
KlipschKid is offline KlipschKid
Account disabled at member's request
Join Date: Aug 2007

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.

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Old 29th September 2013, 08:56 AM   #62
carz is offline carz
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
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Old 30th March 2015, 09:15 AM   #63
duartejunior is offline duartejunior  Brazil
diyAudio Member
Join Date: Sep 2011
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
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Old 30th March 2015, 09:32 AM   #64
marce is offline marce  United Kingdom
diyAudio Member
Join Date: Jun 2007
Location: Blackburn, Lancs
I2S and digital signal path - in-line resistors?
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