how to detect external clock's frequency - 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 7th December 2010, 01:38 PM   #1
diyAudio Member
 
Join Date: Oct 2010
Location: Duisburg, Germany
Default how to detect external clock's frequency

hey there,

I'm working on an audio interface which should be capable of synchronizing to an external word clock signal (sample rate). I'm just wondering how that's done, because: everything I get from outside, is the word clock signal. the master clock frequency for the ICs is of course many times (256fs @ 44.1) higher. where do I get the master clock signal from? maybe by synchronizing an internal clock generator with the external signal? I think about using the CS2000 by cirrus, but I can't find a way, how to synchronize to an external word clock signal with this IC. maybe there's a better way/IC?

so, in master mode everything's fine. I can produce the 11.2896 as well as the 12.288 MHz with the CS2000 and divide down to the needed frequencies for I2C and of course the sample rate itself, but what if I want to use an external word clock signal (44.1, 48, 96 and 192)? that's basically the question.

thanks a lot in advance.

best regards
tommy
  Reply With Quote
Old 7th December 2010, 07:41 PM   #2
diyAudio Member
 
Join Date: Oct 2001
Location: .
A PLL/VCXO combination is used.
  Reply With Quote
Old 7th December 2010, 07:49 PM   #3
diyAudio Member
 
Join Date: Oct 2010
Location: Duisburg, Germany
you mean something like the CDCE913 from TI? or could you give an example IC please?
  Reply With Quote
Old 7th December 2010, 08:19 PM   #4
diyAudio Member
 
Join Date: Oct 2001
Location: .
A combination of devices are used as opposed to a single chip. The Pass D1 schematic and the PMD100 demoboard schematic are two good examples.
  Reply With Quote
Old 8th December 2010, 06:29 AM   #5
diyAudio Member
 
Join Date: Oct 2010
Location: Duisburg, Germany
ok, thanks. I'm gonna take a look at. I also found your answer to more or less this question on diyhifi.org. this helps a lot.

cheers
tommy
  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
[PROJECT] 4 way crossover with signal detect Yoshy Analog Line Level 2 27th November 2009 01:58 PM
What makes the best wide world amplifier..how to detect the one! destroyer X Solid State 39 16th April 2009 09:40 PM
'Signal detect' LED for a small audio amp? HankMcSpank Solid State 1 28th March 2009 06:33 PM
Using this test gear to detect fake power transistors ? gaetan8888 Solid State 9 1st December 2007 09:15 PM
CD Player doesn't detect disc sometimes Gartak Digital Source 4 3rd January 2004 11:58 AM


New To Site? Need Help?

All times are GMT. The time now is 09:33 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2