Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Will AD1896 improve jitter rejection?
Will AD1896 improve jitter rejection?
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
Thread Tools Search this Thread
Old 10th June 2003, 04:46 AM   #1
yejun is offline yejun  United States
diyAudio Member
Join Date: May 2003
Location: new york
Default Will AD1896 improve jitter rejection?

how to connect AD1896 to improve jitter rejection?
Is input 44.1khz and output 192khz a good idea? or the ratio should be integer?
  Reply With Quote
Old 10th June 2003, 05:34 AM   #2
jwb is offline jwb  United States
diyAudio Member
jwb's Avatar
Join Date: Mar 2002
Location: San Francisco, USA
Send a message via AIM to jwb
AD1896 will attenuate jitter. Big time. Hook it up like it says in the datasheet. Ratio makes no difference, and no matter how hard you try you won't get an integer anyway. The AD1896 (and other ASRCs) use a rate estimator to determine the average incoming data rate, and use the master clock to determine the desired output rate. Then they apply digital filters to complete the conversion. The output should have the same jitter as your master clock.

I don't see any reason to not go 44.1 to 192. Your DAC is probably going to oversample this to an ever higher rate anyway.
  Reply With Quote
Old 10th June 2003, 06:01 AM   #3
yejun is offline yejun  United States
diyAudio Member
Join Date: May 2003
Location: new york
Is it possible AD1896 has a better oversampler than normal DAC?
  Reply With Quote
Old 10th June 2003, 11:11 AM   #4
machinow is offline machinow  Bulgaria
diyAudio Member
Join Date: Dec 2002
Location: Bulgaria, Sofia
Originally posted by yejun
Is it possible AD1896 has a better oversampler than normal DAC?
the oversampling is necessary for the digital filter, not anyway.
I suggest you if you use a sigma-delta DAC and no more than 44.1-48kHz source, to resample it to ONLY 48 kHz with the 1896 chip. This will leave more headroom for the digital filter, integrated in the sigma-delta, and it will use 8xoversampling /for example, see AD1853, AD1955 datasheet!/ If u resample to 192kHz, the DAC will be left with only 2xOversampling and the frequency and phase responce becomes uglier

So you can see it is significant what kind of source and DAC you will use. Many people here hate Sigma-deltas, but they are a lot Cheaper and good ones have very good Digital filters inside and characteristics also.
  Reply With Quote
Old 2nd July 2003, 10:23 PM   #5
Халявщик is offline Халявщик  Russian Federation
diyAudio Member
Join Date: Jul 2003
Location: Russia
Hi All!
By the way, ad1896 wonderfully works in a synchronous mode, when it is equivalent to the ordinary digital filter with integer factor of oversampling.
From it is possible to receive 4Xoversampling for 44.1 or 48kHz.
In this mode it is comparable with digital filters SM5842/5847 and subjectively sounds better than SM.
Probably it explains in short length of the digital filter AD1896 (only 64 taps).
In an asynchronous mode, it certainly suppresses a jitter, but sounds considerably worse than SM from NPC.
But to apply a synchronous mode it is possible only in case of presence of separate clockline for synchronization DAC with transport.
This mode can be used as with R-2R DAC, and as with the delta sigma DAC as AD1955 and PCM1738 (i.e. there, where is possible to disconnect the built-in digital filter, in the other case, with ordinary D/S DAC here is no sense in it, good anything is not present in a double digital filtration, where one of them also with fractional factor).
For what to use it in a synchronous mode with R-2R multibit DACs (or inputs 1955/1738 in external digital filter mode), it is necessary to AD1896 on an output to put the shift register. It is possible to carry out synchronous reclocking at desire.
The main generator and divider is necessary for establishing in the DAC module, ad1896 to establish in slave mode (in/out) completely, and requires submission of a grid of frequencies from a divider.
From the same generator the transport / decoder should be synchronized.

sorry my wrong English
  Reply With Quote


Will AD1896 improve jitter rejection?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
generate jitter test signal and measurign jitter using AP2? BJAMR Digital Source 11 1st November 2010 03:07 PM
Improve jitter-performance with second PLL cviller Digital Source 7 9th December 2006 04:48 PM
Gsm and RF rejection ... djdamix Solid State 5 13th October 2004 10:11 AM
Data Jitter Versus Electrical Jitter? 300_baud Digital Source 8 16th July 2004 08:59 PM
Damping transports to kill vibrations sounds and improve signal (jitter)? halcyon Digital Source 6 24th March 2004 09:16 PM

New To Site? Need Help?

All times are GMT. The time now is 07:38 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio