ESS Sabre Reference DAC (8-channel) - Page 22 - diyAudio
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Old 2nd March 2008, 06:32 AM   #211
sidiy is offline sidiy  Canada
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Quote:
Originally posted by rossl


The term (+ something (high) to ground) is a high impedance in parallel with the 75 ohm.

Indeed it would work with (just about) any value for R13 without any reflections. And I won't argue that
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Old 2nd March 2008, 03:41 PM   #212
rossl is offline rossl  United States
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http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3248

instead of a comparator
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Old 2nd March 2008, 03:57 PM   #213
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Keeping in mind that the DAC is virtually immune to external jitter, I'd suggest keeping S/PDIF input simple and functional.
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Old 2nd March 2008, 04:04 PM   #214
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Quote:
Originally posted by rossl
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3248

instead of a comparator

That looks pretty cool, but I can't seem to find a distributor that has them in stock... So might want to find something more available.

Where would you propose sourcing them?
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Old 2nd March 2008, 05:00 PM   #215
rossl is offline rossl  United States
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It looks like you can order some directly from Maxim.

or:

http://www.newark.com/68K9424/semico...questid=118439

Newark has 16000 in stock!
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Old 2nd March 2008, 05:03 PM   #216
rossl is offline rossl  United States
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Quote:
Originally posted by Spartacus
Keeping in mind that the DAC is virtually immune to external jitter, I'd suggest keeping S/PDIF input simple and functional.

Simple and functional: a 75 ohm terminating resistor, a MAX3280 in a SOT-23-5 package, and a bypass cap for the little guy.

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Old 2nd March 2008, 05:38 PM   #217
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Quote:
Originally posted by rossl



Simple and functional: a 75 ohm terminating resistor, a MAX3280 in a SOT-23-5 package, and a bypass cap for the little guy.


You think there should also be a coupling cap?
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Old 2nd March 2008, 05:49 PM   #218
rossl is offline rossl  United States
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The coupling cap was required in the comparator circuit because the comparator action operated at 1/2 VCC.

Where is the SPDIF coming from, inside the box or outside?

The MAX part has a -7V to +12V Common-Mode range.

The SPDIF + doesn't actually need a coupling cap and the SPDIF - on the cable doesn't need to be tied to ground. UNLESS it will violate the common mode range.

If there is a chance of the common mode range being violated, then an input signal transformer would solve the problem.
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Old 2nd March 2008, 05:55 PM   #219
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Well my goal is to make a module that will be flexible. So I don't want to assume that SPDIF is coming from inside or outside. Or even that it is TTL level or 500mv.

Signal transformer is certainly an option, but raises costs, but it does have the benefit of galvanic isolation.

mulling it over.
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Old 2nd March 2008, 05:58 PM   #220
el`Ol is offline el`Ol  Germany
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I just looked at the block diagram of the ESS Sabre and realized it does a DSD-PCM-downsampling before upsampling again. Obviously the semiconductor industry still is less fond of DSD than the music industry. What DACs are there that have true DSD (no change of sample rate)?
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