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Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Non oversampling 2xPCM1702 feed by I2S experiment results
Non oversampling 2xPCM1702 feed by I2S experiment results
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Old 25th March 2002, 10:36 PM   #11
Jocko Homo is offline Jocko Homo  United States
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Ahem.......I believe you meant DF1702. TI no longer lists it. Looked the same, probably sounded the same.

Anyway.......all these newer filters have NO ultrasonic crap. Now look at the SAA7220.........UGH!

I suspect part of the reason is that it has a zero in the response to cancel out of the (3) poles in the analog section.

Jocko
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Old 25th March 2002, 11:03 PM   #12
rfbrw is offline rfbrw
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Jocko,
Two things.
What dac did you use with the DF1704? The other
thing is your preference for digital filters. Is it based on the belief that if the numbers are right the sound must be right and if you dont it like the too bad. Or is it down to listening ?

ray

ps. DF1700 => SM5813
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Old 26th March 2002, 06:53 AM   #13
ergo is offline ergo  Estonia
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Here is the interface schematic I used for I2S conversion

Ergo
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File Type: gif i2s interface for bb.gif (21.2 KB, 3470 views)
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Old 26th March 2002, 08:22 AM   #14
capslock is offline capslock  Europe
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Default little flaw

Hi Ergo,

I believe there is one cosmetic flaw: the L and R signals will not appear at the outputs at the same time. Rather, there will be a skew of 23 microseconds. I doubt that this is audible, it corresponding to one speaker being advanced by 7 mm, but if it does not hurt my purist ear, at least it hurts my purist eye...

Greetings,

Eric
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Old 26th March 2002, 08:34 AM   #15
tschrama is online now tschrama  Netherlands
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Hi Ergo....

I hope you can help me out a bit... I just got myself a couple of PCM1702 chips.. I really really want to get more into digital design and was aiming for a zero oversampling DAC with the PCM1702 .. I'm not aiming for High End performance (yet) ... now what do I need besides the PCM1702?

Could you explain a bit or maybe give me a link to a Digital Audio introduction?

Thanks for this great thread! It is very informative stuff for me...

greetings,
Thijs
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Old 26th March 2002, 08:38 AM   #16
Elso Kwak is offline Elso Kwak  Philippines
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Lightbulb I2S Philips format conversion to Sony/Burr-Brown

Hi All,
The Analog Drevices Application 207 note takes care of that using a dual D-type flip-flop and a quad NAND gate.
The two stereo channels separation is accomplished by the so called "stopped clock" technique i.e. the bitclock is stopped during loading the data to the DAC of one channel (don't remember which one). Both channels are latched simultaneuously as they share the same LATCH. No timing difference between left and right channel.
Unfortunately the Application Note is no longer on the AD website but I can send the PDF file by email if in need.
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Old 26th March 2002, 09:00 AM   #17
tschrama is online now tschrama  Netherlands
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Hi Elso Kwak,

I would very much like to read that application note. Could you send one to me?

Greetings,

Thijs (t.schrama@lumc.nl)
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Old 26th March 2002, 11:45 AM   #18
Jocko Homo is offline Jocko Homo  United States
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rfbrw:

DF1700.........DF1702.......whatever. Getting too old to keep all these numbers in my head.

I used the DF1704 with the PCM1704.

My belief is based on listening (mine and others), and my spectrum analyzer.

Jocko
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Old 26th March 2002, 06:49 PM   #19
rfbrw is offline rfbrw
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Jocko,
I am sort of in the middle with this o/s no o/s debate as I am still not sure. The thing is the non o/s camp are no less adamant that they are right. Whatever,my way out is finish off my dac with a digital filter (NPC5843) that can be switched in and out of circuit.

Re: AN207
AN 207 IS available on the ADI website at http://www.analog.com/library/applic...udio/AN207.pdf
Alas AN207 will not work with the PCM1702 or PCM63 as is.
ray.
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Old 26th March 2002, 06:55 PM   #20
Jocko Homo is offline Jocko Homo  United States
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No problem with being open-minded. I just can't see the point.

I personally don't like the sound of tubes, but I understand the appeal. I suspect the non-o/s crowd really doesn't like digital, which is fine. Then they should stick to vinyl and tubes, and we will all be happy.

See other posts today about slew-rate & op-amps in I/Vs. Might explain my adamant postion.

Jocko
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