ESS Sabre Reference DAC (8-channel) - Page 227 - 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 28th June 2013, 03:22 PM   #2261
Bunpei is offline Bunpei  Japan
diyAudio Member
 
Join Date: Aug 2008
Hi, Simonvan!

What is your definition of PCM?
A possible answer may depend on the definition.
Beside that, do you have a clear understanding on a delta-sigma( sigma-delta) modulation?

Bunpei
  Reply With Quote
Old 30th June 2013, 09:37 AM   #2262
Bunpei is offline Bunpei  Japan
diyAudio Member
 
Join Date: Aug 2008
I'd like to show my own understanding here.

ES9018 incorporates a multi-level (65 levels) delta-sigma(sigma-delta) modulator.
In "White Paper" published by ESS, they use the term "six bit". However, I think it should not be interpreted as "PCM" because "PCM" does not refer delta-sigma modulated data and refers a binary format of 2's compliment in general. A DA module in ES9018 processes 65 level delta-sigma modulated data coded in "Unary" or "Thermometer" coded and DEMed.

In the case of PCM input, a usual PCM data is converted into 65 level delta-sigma modulated data.
In the case of DSD input, I imagine the original DSD data is also converted first into a certain form of internal multi-level representation and then the data is delta-sigma modulated into 65 levels as PCM is processed.

Last edited by Bunpei; 30th June 2013 at 09:40 AM.
  Reply With Quote
Old 14th July 2013, 02:17 AM   #2263
diyAudio Member
 
Join Date: Jun 2012
Location: Seoul, korea
Default Pls tell me about 2 register setting for stereo mode for SPDIF/SERIAL/DSD input.

To make to get stereo mode for SPDIF/SERIAL/DSD input, which 2 registers do I set. I guess 1 register is #14. If it is right, another?


Quote:
Originally Posted by dusfor99 View Post
Russ,

I will put together a sorta mini app note on how to wire the chip up such that you only need 3 pins connect and you can get all channel to parallel together in all 3 modes. I know I should have just made it easy programming but that would be no fun right? No just kidding, I really overlooked that and its my mistake. But for now, you can short

DSD5 to DSD1
DSD6 to DSD4 to DSD2.

With these pins connected like so, there is 2 register setting you can make to get stereo mode for SPDIF/SERIAL/DSD input.

Also, pin25 on your schematic should be connected to 3.3V

I will get you the register settings soon.


Thanks

Dustin
  Reply With Quote
Old 14th July 2013, 02:30 AM   #2264
diyAudio Member
 
Join Date: Jun 2012
Location: Seoul, korea
Click the image to open in full size.
Please tell me about the IC4(6 pin smd), IC5's name on the Buffalo 3 SE input.
  Reply With Quote
Old 28th July 2013, 09:54 AM   #2265
Bunpei is offline Bunpei  Japan
diyAudio Member
 
Join Date: Aug 2008
Default Analog output without AVCC power

I'm recently trying a various AVCC power supply systems for ES9018 of mono configuration.
In the process, I happened to forget to connect an AVCC power and turned digital 3.3V and 1.2V on! Alas, how so? A small sound came from my amplifier though the level is low. What internal mechanisms may make such phenomena?

In my configuration, 8 channel analog signal pins are tied and connected to a primary of line transformer. No voltage is given to those analog out pins at all.
  Reply With Quote
Old 29th July 2013, 04:47 PM   #2266
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
maybe it worked in some kind of Class B way? where the signal itself supplied the analogue bias voltage enough to get some signal through?
  Reply With Quote
Old 30th July 2013, 02:15 PM   #2267
Bunpei is offline Bunpei  Japan
diyAudio Member
 
Join Date: Aug 2008
Hi, qusp!

Thank you very much for your post. I'm sorry that I could not catch on your explanation as I can imagine no circuit diagram along with your explanation because of my limited knowledge.
You told a possible "N-channel (MOS) arrangement" in the analog output stage of the DAC. Does your guess of this time match well your previous speculation?

Bunpei
  Reply With Quote
Old 30th July 2013, 03:52 PM   #2268
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
i'm just guessing, but then thats all we can do yes?

what I mean is, depending on the exact format or type of the fets (unknown), perhaps the missing analogue reference supply can be replaced by signal, so the swing of the signal itself (generated previous to the output stage) is enough to get something through, by turning the fets on with whatever signal voltage is over the gate threshold voltage and RDSon, but not with enough drive/bias to get full output. without AVCC the return will be compromised too, which would also contribute to the lack of output strength, but I can see how there could be something.

again i'm just guessing here but that is a mechanism that would allow it. distortion will be significantly higher and the waveforms incomplete, but it would be recognisable as music.

Last edited by qusp; 30th July 2013 at 03:57 PM.
  Reply With Quote
Old 1st August 2013, 03:09 PM   #2269
Bunpei is offline Bunpei  Japan
diyAudio Member
 
Join Date: Aug 2008
Default DPLL is not likely to be disabled on ES9018-2M

When I read a press release of new ES9018-2M, I got such an impression that we could disable DPLL functionality on the chip by setting a new register appropriately.

Today, after I browsed its datasheet for the first time, I thought it would be impossible.
Does anyone interpret the datasheet descriptions in different manners?
  Reply With Quote
Old 14th January 2014, 12:59 PM   #2270
diyAudio Member
 
Join Date: Sep 2009
Default High pitch whining sound from ESS9018/TPAIII

Hi All,

I encounter some issues with the following setup:

MiniDSP Mini-Sharc with the digital input module (MiniDIGI) ->

TPA Buffalo III in voltage out mode (loaded with a 1K resistor and a 3300pF Low-pass filter)

I get a high pitching noise on the oputput of the DAC, that is with or without the I2S lines from the Mini-Sharc connected or not With the I2S lines connected the noise is changing slightly and less stable though.

All DIP-switches are OFF (apparently new firmware) as per the datasheet recommandation, only the SP/DIF input is ON (i.e. set to bypass).

I have tried different supplies for the DAC board (simple 7508 regulator, LT1963 regulator) nothing wont change.

I'd nned some help troubleshooting the thing, I am slowly getting crazy...
  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 09:35 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