ESS Sabre Reference DAC (8-channel) - Page 140 - 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 29th April 2009, 04:16 AM   #1391
diyAudio Member
 
Join Date: Oct 2006
Quote:
Originally posted by Javin5
Hello Dustin

A question on the ES9008: Does the selection of either slow or fast rolloff work both with SPDIF and I2S inputs?

My setup with SPDIF-input somehow seems to be stuck to slow rolloff.

Kurt

Strange, both options work for the the SPDIF and I2S modes...

Sorry I wish I had a better answer.

You really should be able to jsut program the regsiter that contains the bit to control fast/slow rolloff.


Thanks

Dustin
  Reply With Quote
Old 29th April 2009, 04:20 AM   #1392
diyAudio Member
 
Join Date: Oct 2006
Default Re: Re: Re: Sabre I2C read

Quote:
Originally posted by matejS



Thanks, Dustin. It works!

My setup is 24.576Mhz clock, I2S input , SPDIF source from HK HD970 CD (most likely 48kHz).

Read DPLL_NUM (MSB-LSB) = 0x20 0x00 0x4C 0x00

If I use equation from datasheet I get strange results... however if I use the following equation:

DPLL_NUM / (2^32) * 24 576 000 / 64

I get 48 001.7395

Is there an error in datasheet?

Matej


Hi Matej,

Possibly, but I am not sure. I will try to remeber to check it out tommorow at work. I know that there is a /64 for the I2S mode, but not for the SPDIIF... (or vice versa, I will have to go through it again).


Thanks

Dustin


PS good so see you got it working. I didn't know if anyone would use the DPLL_NUM for anything, but I thought I might as well put it in there anyways.

Thanks

Dustin
  Reply With Quote
Old 29th April 2009, 04:25 AM   #1393
diyAudio Member
 
Join Date: Oct 2006
Quote:
Originally posted by Zoran
Hi,
I have some Q,
about Sabre ES9008 I-outputs :
Are they Current Source Output or Current Sink Output type?
*
Which one of theese two diagrams, I uploaded
shoud be better for the passive I-to-V conversion?
*
Which value is the lowest value of passive R iv that I could apply,
and not to damage dac chip?
Is the lower value of RIV lowering the distorsion for ES9008, same like in
for instance pcm63 and tda1541 dacs?
Or not?
*
I put, just for the test 1K (at each dac Iout, each -,+... )
the chip remain the just slight warm...
*
could someone answer please?
thanks



Hi Zoran,

THE output looks like a voltage source with 781.25 Ohm output impedance. "Current mode" is simple when you put the output to a virtual ground and some level (we use 1.65V) then therefore use the current though the 781.25 Ohm in a IV stage. I is not a typical "current source" or "current sink" like the other chips you mention. You could short the output of the chip to ground or AVCC without damaging the chip.

Hope this info helps


Thanks

Dustin
  Reply With Quote
Old 29th April 2009, 07:24 AM   #1394
Zoran is offline Zoran  Serbia
diyAudio Member
 
Join Date: Jan 2004
Location: Belgrade
Hi Dustin,
thanks for answering...
It is from help to me.
*
I designed open topology, so I have Vref of 3.3V analog supp. for each channel,
and also Vref of 1.65V in case of using standard OP IV conn.
but passive R-IV, ball. tube out, SE output transformer is an option too,
as well as current buffer...
*
Do You have any experiance or idea, how low can I go with passive R
(because I need lower Vout before tube stage, gain of the tube stage will be probably
about 15 times... So it will be nice to have about hundered mV after R iv).
*
Thanks
__________________
###
  Reply With Quote
Old 29th April 2009, 11:50 AM   #1395
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
I have been using the DPLL# feature to get the sample rate for a while now. Its working fine for me.

http://www.twistedpearaudio.com/foru...ts&m=2842#2842

Cheers!
Russ
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 29th April 2009, 11:54 AM   #1396
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Quote:
Originally posted by Zoran
Do You have any experiance or idea, how low can I go with passive R
(because I need lower Vout before tube stage, gain of the tube stage will be probably
about 15 times... So it will be nice to have about hundered mV after R iv).
*
Thanks
You can simply use a resistor to AGND or any buffered voltage from AGND to AVCC.

There is nothing more to it.

If you use AVCC/2 then your DAC will not have to sink any current through your R when idle.

Cheers!
Russ
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 29th April 2009, 03:52 PM   #1397
Ciu is offline Ciu  France
diyAudio Member
 
Join Date: Feb 2005
Location: Northern France
Hello Russ !

Considering the I/V conversion, what 's value for Riv that gives the 'sweet spot' (lowest DNR ?) ?

Thanks
R.C.
  Reply With Quote
Old 29th April 2009, 04:19 PM   #1398
rab is offline rab  Netherlands
diyAudio Member
 
Join Date: Jul 2004
Location: utrecht nl
Hi Dusfor99 and Russ,

To add to the previous question from Ciu

I also want to use the ES9032 converter for measurements. Is the distortion reduced if I put 4 da converters in parallel but not feeding it the same signal, but every next converter delay the input signal one or more samples. Distortion is then perhaps spread a bit more? Or is -120 db the absolute bottom you can reach.

I also heard that somebody cooled chip with peltier element. Is that producing lower distortion (at least leakage will be better, but is distorion also better)?

Are there other hints or ways to reduce distortion?

Thanks for info
  Reply With Quote
Old 29th April 2009, 05:34 PM   #1399
rolls is offline rolls  Switzerland
diyAudio Member
 
Join Date: Aug 2007
Quote:
Originally posted by rab


I also heard that somebody cooled chip with peltier element. Is that producing lower distortion (at least leakage will be better, but is distorion also better)?

Thanks for info
We listened to a peltier cooled buffalo for a short time, the sound was clearer, but I think they call these thermal distorsions, you cannot measure them at the moment, these seem to be inherent to solid state. I don't know anything about it, I have just heard it, the improvement, and for the same reason I use batteries without regulators. To really implement a peltier is a bit tricky because of condensate, but we can use a normal cooling element, as big as possible.
regards
Andre
  Reply With Quote
Old 29th April 2009, 11:12 PM   #1400
Javin5 is offline Javin5  Switzerland
diyAudio Member
 
Join Date: Mar 2006
Location: Switzerland
Rab, if you add delayed samples of a signal, you are changing the frequency response. If you are able to accurately compensate for that, or if flat response to 20 kHz is unimportant to you, then you could potentially obtain somewhat lower distortion, but only if the DAC-errors were uncorrelated. And you would need an absolutely outstanding IV and output stage with distortion and noise probably around -140 dB or so.

Kurt
  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



New To Site? Need Help?

All times are GMT. The time now is 07:08 PM.


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