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Old 26th September 2002, 06:00 PM   #1
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Default Which digital filter to use ?

After Non OS experiments I would like to make a DAC with CS8412, AD1865N-K or TDA5141-S1 ( Have both, I can choose ) and a digital filter. Any tips are welcome.

Just for curiousity: does anybody have any idea how a four fold or two fold oversampling DAC with a good converter can sound ?

Since I am not kean on SMD I am to use new or old DIP types.
I know that the word SAA7220 is enough for some people to start having strange feelings in their stomach...

I have a low cost SM5807, one SM5813 and several new PD0050's. The last one is a Pioneer 20 bit digital filter which in its time was supposed to be good. I can't find any documentation on the PD0050.
Does anybody know who made these Pioneer chips ? Or where to find datasheets ? I googled a lot but found nothing.
And are these chips to be taken serious nowadays ?

Or which new type can I use ?
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Old 27th September 2002, 04:38 AM   #2
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Depends on what DAC you want to use, whether or not you are using I2S, how high an oversampling rate you want, how many bits, R-2R or delta-sigma........

Jocko
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Old 27th September 2002, 07:33 AM   #3
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OK, to be clear:

I am planning to use AD1865, second choice TDA1541, thus 18 or 16 bits. Thus I2S or serial, depends on the DAC.Four or eight times oversampling. Only R2R.
IMHO 1 bit converters are inferior.

Well, I can make it clearer:

AD1865, 18 bit, 8 times oversampling. It is the first time I want to use the AD1865. Not sure about the 8 times oversampling. Will look into the datasheet later.
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Old 27th September 2002, 01:05 PM   #4
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Default At the risk of sounding pendantic...

Ever thought of, oh......say.......20 or 24 bits?

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Old 27th September 2002, 01:08 PM   #5
2002tii is offline 2002tii  Norway
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I see that the datasheet on AD1865 uses SM5813.

Is there any reason not to use the AD1892?
You can get it as sample from AD`s web page:
<a href="http://products.analog.com/products/SamplesInfo.asp?product=AD1892">AD1982 Samples</a>
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Old 27th September 2002, 01:26 PM   #6
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I have one SM5813 which may be suitable for the job. Its aged though and there might be a modern chip that's better.

AD1892 is a digital receiver and sample rate convertor. It isn't a digital filter for as far as I know.

Why 20 or 24 bit ? Please explain Jocko. Until now I had very good results with 16/18 bit. None of the nowadays produced 24 bit cdplayers that I have heard ( please read carefully ) sound natural to me. And I don't even want to talk about DVD players...
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Old 27th September 2002, 03:04 PM   #7
2002tii is offline 2002tii  Norway
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Sorry, didn`t read your post right...
No, AD1892 isn`t a digital filter.
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Old 28th September 2002, 04:51 AM   #8
BrianL is offline BrianL  United States
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Is the Pioneer the one with some euphamistic name
that supposedly warms up the sound by folding spurious
junk back into the passband. "Legato Link" I believe
is what they call it. Highly talked up by the Stereophile
crowd, but blatently stupid engineering and rated as
not at all good by ears I respect.

One can argue various topologies, makes, models,
but doing things obviously wrong is not the way to
good sound.

As to SMT, you'd better learn to deal with it as
through-hole ICs are going away. Just hope you
can get some manageable package like SOIC, and
not something even smaller.
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Old 28th September 2002, 05:39 AM   #9
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Default Why 20 or 24 bit?

I've built many. They sound excellent. At least the people who send me their players and money seem to think so.

Peter Daniel......(on another er, ah, thread, if you can call it that.......) mentions that he uses the Burr-Brown '1704 chips too.

Jocko
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Old 28th September 2002, 05:47 AM   #10
jcarr is offline jcarr  United States
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My favorites are the Pacific Microsonics filters (PMD100, PMD200). Too bad that they haven't followed up with any high-rez filters, as with their design talent, the results would likely be outstanding.

But I suppose that after Microsoft bought out the company, the priorities shifted. :-(

regards, jonathan carr
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