What about SSM3582? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

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 9th February 2017, 12:48 PM   #1
diyAudio Member
 
KaffiMann's Avatar
 
Join Date: Sep 2009
Location: Grua, Just north of Oslo
Default What about SSM3582?

Where is the buzz about this chip? I find it super interesting!

Info from the spec sheet:
"Digital input stereo, high efficiency Class-D amplifier
Operates from a single 4.5 V to 16 V supply
State-of-the-art, proprietary, filterless Σ-Δ modulation
106.5 dB signal-to-noise ratio
0.004% total harmonic distortion plus noise (THD + N)
at 5 W into 8 Ω
38.5 μV rms A weighted output noise"

I am dreaming about a super easy, cheap, low noise, cool running amp with direct connection to dsp!

Can someone please make a great layout for this?

Edit:
Oh, and I just have to coin this phrase: 5 watts ought to be enough for anyone!
Attached Files
File Type: pdf SSM3582-958192.pdf (872.5 KB, 130 views)

Last edited by KaffiMann; 9th February 2017 at 12:52 PM.
  Reply With Quote
Old 9th February 2017, 11:52 PM   #2
diyAudio Member
 
Join Date: Sep 2004
Location: Northland, New Zealand
Wow! That's a nice chip for efficient drivers. Filterless definitely helps distortion characteristics. Would be nice with compression drivers.

Cheers,
Mike
  Reply With Quote
Old 10th February 2017, 01:49 AM   #3
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 145
Send a message via Yahoo to abraxalito
Looks to me to be rather let down by having a DAC inside rather than a direct conversion from PCM to PWM as do many other chips (STA333 and LV4904 to name just two).
__________________
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
  Reply With Quote
Old 10th February 2017, 03:35 AM   #4
diyAudio Member
 
Join Date: Oct 2014
Yes,very nice with high efficiency
remember you need MCU to control it!
__________________
3e Audio | Enhanced design,Exceed the edge,Enjoy sound with passion!!!
Project: TPA3251D2 - ICE2QS03G
  Reply With Quote
Old 10th February 2017, 06:54 AM   #5
diyAudio Member
 
Join Date: Sep 2015
Has somebody actually measured a difference between a built-in DAC or digital PCM to PWM conversion? From looking at graphs in TI documentation for chips with different approaches I can't see any difference.
  Reply With Quote
Old 13th February 2017, 01:47 PM   #6
diyAudio Member
 
KaffiMann's Avatar
 
Join Date: Sep 2009
Location: Grua, Just north of Oslo
Quote:
Originally Posted by abraxalito View Post
Looks to me to be rather let down by having a DAC inside rather than a direct conversion from PCM to PWM as do many other chips (STA333 and LV4904 to name just two).
I can understand your point of view, but comparing noise floor between chips it seems to me that most very low noise class D use analog input, or just a dac like on this. Anyway, it seems relatively comparable to the LV4904V only the SSM3582 is lower noise?

Just look at the ICE modules, really low noise stuff, but with analog in. A lot of the PCM to PWM seem to hit some barrier at maybe 100db. And also the option to just connect the SSM3582 with i2s makes it pretty versatile.

I am rather interested in a sort of Pass ideology but with class D amps, "the first watt is the most important watt" or something like that. And in my opinion the most long term tolerable class D are often the lowest noise ones. To get more than 5 really low noise watts, and it's also stable at low z loads, SSM3582 looks like a price/performance champion to me.
  Reply With Quote
Old 13th February 2017, 05:10 PM   #7
sgpu is offline sgpu  United Kingdom
diyAudio Member
 
Join Date: Jan 2012
Location: Nottingham, UK.
I'm using 5 of these chained on TDM output from a DSP. Looking forward to bench testing!

3eaudio - they work in stand alone mode too!

Small mono mode board layout idea below. Don;y think it really needs the choke or output filter caps. Depends if your cables are 20cm+.
Attached Images
File Type: png board.png (34.5 KB, 381 views)

Last edited by sgpu; 13th February 2017 at 05:16 PM.
  Reply With Quote
Old 13th February 2017, 06:43 PM   #8
diyAudio Member
 
KaffiMann's Avatar
 
Join Date: Sep 2009
Location: Grua, Just north of Oslo
Quote:
Originally Posted by sgpu View Post
I'm using 5 of these chained on TDM output from a DSP. Looking forward to bench testing!

3eaudio - they work in stand alone mode too!

Small mono mode board layout idea below. Don;y think it really needs the choke or output filter caps. Depends if your cables are 20cm+.
Interesting that you're going with 5x mono setup. Very nice low z capabilities in mono. Do you have any way to measure how it performs in your setup?

One thing I like about this: it's the perfect match for a 12v 7ah SLA with a cheap charger, makes a real easy setup.

Edit:
Nevermind

Last edited by KaffiMann; 13th February 2017 at 07:09 PM.
  Reply With Quote
Old 13th February 2017, 06:51 PM   #9
sgpu is offline sgpu  United Kingdom
diyAudio Member
 
Join Date: Jan 2012
Location: Nottingham, UK.
Yes indeed. I'll be using an Audio Precision APx515 to test the board - traded up a Rohde UPV.

The plan was to use a 120W Vicor DC-DC (8-60v in, 16V out) buck-boost and a LT3042 for the 5VADD supply. However, looking at the specs the internal LDOs on the SM3582 seem very good already. I just liked the idea of keeping those suppliers away from the high transient main PVDD supply.

I plan to investigate:

- various bypass caps from X7R to Panasonic ECPU, Cornell FCA and Rubycon MU.
- THD effect of chokes such as the DLW5BTN for longer cable lengths.

Last edited by sgpu; 13th February 2017 at 07:01 PM.
  Reply With Quote
Old 13th February 2017, 07:13 PM   #10
diyAudio Member
 
KaffiMann's Avatar
 
Join Date: Sep 2009
Location: Grua, Just north of Oslo
Quote:
Originally Posted by sgpu View Post
Yes indeed. I'll be using an Audio Precision APx515 to test the board - traded up a Rohde UPV.

The plan was to use a 120W Vicor DC-DC (8-60v in, 16V out) buck-boost and a LT3042 for the 5VADD supply. However, looking at the specs the internal LDOs on the SM3582 seem very good already. I just liked the idea of keeping those suppliers away from the high transient main PVDD supply.

I plan to investigate:

- various bypass caps from X7R to Panasonic ECPU, Cornell FCA and Rubycon MU.
- THD effect of chokes such as the DLW5BTN for longer cable lengths.
Very exciting!
I am a bit curious about whether it feeds any noise back to the power bus if you have several on the same psu. And if a few diodes and a nice little cap can be enough to separate this noise.
  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 06:31 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki