SM5840....DF1704..changing digital filter ?

Lyra · 8th February 2004, 02:22 AM

How good is the old SM5840 ?
Would it be an idea to change it for a DF1704 ?

The SM5842 should be an outstanding performer (I read...) but I can't find anything about the "quality" of SM5840.

The data sheet indicate that the "numbers" of the DF1704 is better versus SM5840....but that doesn't mean better sound ?

According to the schematics the signalflow now is: EIAJ -> SM5840 -> CF37606 -> SM5828 -> AD1862

According to the frase "simpler is better" my choice would be: EIAJ -> DF1704 -> AD1862

This would be more understandable too, as I dont have a clue what the CF37606 is.....can't find anything regarding this chip....

Regards
Lyra

rfbrw · 10th February 2004, 02:57 AM

I would have thought it was irrelevant what anyone else thought of the SM5840. You either like it or you don't.
As for the CF37606, you could see if your national library holds a series of databooks in its reference section by a company called
Derivation and Tabulation Associates Inc. (D.A.T.A) They compile huge databooks on nearly every IC on the planet, broken down into classes, and the discontinued devices book may have the information you seek.

Lyra · 10th February 2004, 03:34 AM

Quote:

Originally posted by rfbrw
I would have thought it was irrelevant what anyone else thought of the SM5840. You either like it or you don't.

Yes...it is....but I have not heard the other one yet, and I don't know if I am missing something.....

The function of the CFxxx chips are as far I can see not neccesary anylonger, but I dont know If it oversample the signal or not.
The SM5840 can oversample 4, or 8 times, but this is controlled by the controller.
My thought was that the DF1704 could be hardwired to the correct function, no matter wat the controller try to set.... + the DF1704 is a decade newer chip.....that shouldn't be so bad....I think.
Much!!! have happened in the digital prosessing front since this SM5840 left the plant.

The player plays nize !, but if there are more to get.....I want it !

.....and, simple is often better...I like to believe that anyway

Lyra

rfbrw · 11th February 2004, 04:15 PM

You could use the SM5847 or the DF1704 as both will probably be an improvement on the SM5840.

kimschips · 26th September 2005, 08:12 PM

Hello Lyra.

Great thread.

I have an Onkyo cd-player with CXD2500->SM5843->SM5861
I have also thought about replacing SM5843 with DF1704 and SM5861 with PCM1798.

Have you tried your ideas from post one?

Is EIAJ format the same as Right justified format with 64FS?
(Would like how to set DF1704 to accept EIAJ from CXD2500)

All the best
Kim

Jocko Homo · 26th September 2005, 09:18 PM

Where are you going to find the AD1862s? Just curious.........

Jocko

Fin · 27th September 2005, 02:51 AM

If you need SM5842APT or SM5843AP1 - I can help.

Cobra2 · 27th September 2005, 07:22 AM

http://www.audiotuning.de/index.html?1-51-digital.html

Arne K

rfbrw · 30th September 2005, 11:29 PM

Quote:

Originally posted by Arcamaniac
If you need SM5842APT or SM5843AP1 - I can help.

How much do you want for the '5842?

Fin · 1st October 2005, 09:25 AM

Quote:

Originally posted by rfbrw

How much do you want for the '5842?

Send me a private mail and we can discuss it.

Regards

8th February 2004, 02:22 AM	#1
Lyra diyAudio Member Join Date: Nov 2003 Location: Norway	SM5840....DF1704..changing digital filter ? How good is the old SM5840 ? Would it be an idea to change it for a DF1704 ? The SM5842 should be an outstanding performer (I read...) but I can't find anything about the "quality" of SM5840. The data sheet indicate that the "numbers" of the DF1704 is better versus SM5840....but that doesn't mean better sound ? According to the schematics the signalflow now is: EIAJ -> SM5840 -> CF37606 -> SM5828 -> AD1862 According to the frase "simpler is better" my choice would be: EIAJ -> DF1704 -> AD1862 This would be more understandable too, as I dont have a clue what the CF37606 is.....can't find anything regarding this chip.... Regards Lyra

27th September 2005, 02:51 AM	#7
Fin diyAudio Member Join Date: Dec 2003 Location: -	Did someone mention SM5842?? If you need SM5842APT or SM5843AP1 - I can help. __________________ Regards Fin

27th September 2005, 07:22 AM	#8
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	To make it easy.... http://www.audiotuning.de/index.html?1-51-digital.html Arne K __________________ Ars longa, vita brevis

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10th February 2004, 02:57 AM	#2
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	I would have thought it was irrelevant what anyone else thought of the SM5840. You either like it or you don't. As for the CF37606, you could see if your national library holds a series of databooks in its reference section by a company called Derivation and Tabulation Associates Inc. (D.A.T.A) They compile huge databooks on nearly every IC on the planet, broken down into classes, and the discontinued devices book may have the information you seek.

11th February 2004, 04:15 PM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	You could use the SM5847 or the DF1704 as both will probably be an improvement on the SM5840.

26th September 2005, 08:12 PM	#5
kimschips diyAudio Member Join Date: Dec 2004 Location: Denmark	Hello Lyra. Great thread. I have an Onkyo cd-player with CXD2500->SM5843->SM5861 I have also thought about replacing SM5843 with DF1704 and SM5861 with PCM1798. Have you tried your ideas from post one? Is EIAJ format the same as Right justified format with 64FS? (Would like how to set DF1704 to accept EIAJ from CXD2500) All the best Kim

26th September 2005, 09:18 PM	#6
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Where are you going to find the AD1862s? Just curious......... Jocko

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