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 Line Level DACs, Digital Crossovers, Equalizers, etc.

Alternative to the SAA7220 for TDA1541 dac's
Alternative to the SAA7220 for TDA1541 dac's
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 22nd April 2016, 03:53 PM   #21
Torchwood421 is offline Torchwood421  United States
diyAudio Member
 
Join Date: Jul 2011
Location: Prior Lake, MN
Default Page 2

Page 2 of datasheet.
Attached Images
File Type: jpg IMG_0466.jpg (963.5 KB, 271 views)
  Reply With Quote
Old 22nd April 2016, 03:55 PM   #22
Torchwood421 is offline Torchwood421  United States
diyAudio Member
 
Join Date: Jul 2011
Location: Prior Lake, MN
Default Page 3

First 3 pages are all you really need.
Attached Images
File Type: jpg IMG_0465.jpg (973.1 KB, 262 views)
  Reply With Quote
Old 23rd April 2016, 04:16 AM   #23
chungtat is offline chungtat  Hong Kong
diyAudio Member
 
Join Date: Mar 2005
Location: HK
Thank a lot. I am going to try it.
  Reply With Quote
Old 30th April 2016, 01:54 AM   #24
Torchwood421 is offline Torchwood421  United States
diyAudio Member
 
Join Date: Jul 2011
Location: Prior Lake, MN
Thumbs up NPC filter

Quote:
Originally Posted by chungtat View Post
Thank a lot. I am going to try it.
Please do try it and report your findings for every ones benefit. Be sure to review the thread, there are many hints on how to wire it up.
  Reply With Quote
Old 30th April 2016, 02:48 AM   #25
abraxalito is offline abraxalito  United Kingdom
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Send a message via Yahoo to abraxalito
Quote:
Originally Posted by Torchwood421 View Post
The NPC SM5814 is cheap. It features more taps and best of all it is doing 18 bit math. SAA7220 is 14 bit math.
I spent some time reverse engineering the SAA7220 - it uses 12bit coefficients, just like the DS says (12*16 multiplier).

Quote:
Sound difference is large. Better clarity and the trebles are awesome with the NPC chip. Something no NOS D/A in my experience can do.
Perhaps your reconstruction filter isn't up to snuff? I certainly had that problem (lack of HF clarity) before I built a sharp filter to take out the images - now my HF is as sweet as I need

Quote:
Nice if someone would emulate the PMD100....
I'll probably be revisiting my digital filter project sometime later this year, using a new LPC5411x chip from NXP which has the interfaces required along with enough MIPs.... I reckon for digital filters, minimum oversampling is best, 4X seems too high.

<edit> Looking at the FR plot for the SM5814 (thanks for the DS!) its a half-band filter and that's definitely sub-optimal for audio.
__________________
I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant - Alan Greenspan

Last edited by abraxalito; 30th April 2016 at 03:12 AM.
  Reply With Quote
Old 30th April 2016, 03:26 AM   #26
Torchwood421 is offline Torchwood421  United States
diyAudio Member
 
Join Date: Jul 2011
Location: Prior Lake, MN
Default NPC SM5814

Quote:
Originally Posted by abraxalito View Post
I spent some time reverse engineering the SAA7220 - it uses 12bit coefficients, just like the DS says (12*16 multiplier).

Perhaps your reconstruction filter isn't up to snuff? I certainly had that problem (lack of HF clarity) before I built a sharp filter to take out the images - now my HF is as sweet as I need

I'll probably be revisiting my digital filter project sometime later this year, using a new LPC5411x chip from NXP which has the interfaces required along with enough MIPs.... I reckon for digital filters, minimum oversampling is best, 4X seems too high.

<edit> Looking at the FR plot for the SM5814 (thanks for the DS!) its a half-band filter and that's definitely sub-optimal for audio.
I stand corrected on the 12 bit math. The NPC filter may not be a PMD100, however using the same filter as used with the SAA7220 it is far superior. Lower noise maybe why. These days I have moved more toward passive filters as they harm the sound quality less. My ribbon tweeter tells me there is no comparison. The SM5814 beats the SAA7220 every time. Really has to be heard with high hats and flutes. I would be very interested in an emulation project. If you do it I will be watching and waiting to get on board. The TDA1541 really deserves a better filter then the SAA7220. Sadly I don't have the knowledge to design a solution like you suggest. I did look at the PMD100, trouble is they are all used and very expensive. I hope you come up with a better solution. For now I don't miss the SAA7220 at all.
  Reply With Quote
Old 30th April 2016, 03:32 AM   #27
abraxalito is offline abraxalito  United Kingdom
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Send a message via Yahoo to abraxalito
I have been through my passive filter stage - now I'm back into active filters once again, this time around though without opamps. Active filters take up much less room - no bulky inductors.

I totally agree that the TDA1541 is crying out for a much better filter - with the latest LPC5411x chip, at last there's a low enough power part with I2S interfaces available to do the job well. I've watched NXP's MCU range for many years now, this new one's exciting...
__________________
I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant - Alan Greenspan
  Reply With Quote
Old 30th April 2016, 08:54 AM   #28
Mayday is offline Mayday  Sweden
Project Horder & Blogger
diyAudio Member
 
Mayday's Avatar
 
Join Date: Mar 2004
Location: Sweden
Alternative to the SAA7220 for TDA1541 dac's
Quote:
Originally Posted by abraxalito View Post
I have been through my passive filter stage - now I'm back into active filters once again, this time around though without opamps. Active filters take up much less room - no bulky inductors.

I totally agree that the TDA1541 is crying out for a much better filter - with the latest LPC5411x chip, at last there's a low enough power part with I2S interfaces available to do the job well. I've watched NXP's MCU range for many years now, this new one's exciting...
That makes me "jump for joy", a new filter option for the TDA1541A

I'm going to try Dave's solution in my parallel Red Baron DAC, it's easy enough to build and wire between WM8804/8805 and the TDA1541A.
Thanks Dave, the minnesotan santa was much appreciated
__________________
The more you learn, the more you realize how little you know...
My blog, go have a look
  Reply With Quote
Old 30th April 2016, 10:06 AM   #29
esgigt is offline esgigt  Netherlands
diyAudio Member
 
Join Date: Dec 2013
Quote:
Originally Posted by abraxalito View Post
using a new LPC5411x chip from NXP which has the interfaces required along with enough MIPs....
You mean this one: http://www.nxp.com/documents/data_sheet/LPC5411X.pdf ?

Might be interesting if there could be a SAA7220 pin-compatible solution. Plug-in, you know
  Reply With Quote
Old 30th April 2016, 10:41 AM   #30
abraxalito is offline abraxalito  United Kingdom
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Send a message via Yahoo to abraxalito
Yes that's the one - its got two I2S peripherals and plenty of RAM along with very low power consumption (running flat out around 7mA draw for the CPU alone). So it should solve one of the biggest issues with the SAA7220, the fact its so power hungry.

The PMD200 (http://www.hifimaker.com/documents/pmd200.pdf) is just a pre-programmed Motorola 56k DSP so I can't see a reason why an ARM chip optimized for DSP work couldn't fulfill the same function here. All the more fitting that Freescale is now a part of NXP
__________________
I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant - Alan Greenspan
  Reply With Quote

Reply


Alternative to the SAA7220 for TDA1541 dac'sHide 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
TDA 1541 DAC w/o SAA7220, SC8412, 74HC4040/clock Ayot Digital Line Level 1 6th September 2015 09:59 PM
LM317/337 for TDA1541 and SAA7220? Stabby Digital Line Level 3 13th February 2015 06:37 AM
TDA1541+SAA7220+CS8412+NE5534 schematic/circuit anyone ? srinath Digital Line Level 11 15th January 2014 01:12 PM
Saa7220 sparks from ground pin (killed a saa7220 ?) ash_dac Digital Source 26 26th March 2006 02:32 PM
TDA1541/SAA7220 replacement board Jocko Homo Swap Meet 12 20th December 2003 12:53 PM


New To Site? Need Help?

All times are GMT. The time now is 08:28 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki