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Old 11th September 2003, 03:02 PM   #1
Cobra2 is offline Cobra2  Norway
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Default Tda1547 Dac

Howcome there are so few constructions around these DAC - chips?
Not considered good, or just scarce?
I have spent a day searching the web, trying to find descriptions or tweaks, but came up emptyhanded.
Can someone please help / comment / suggest something about the "DAC-7".

Arne K
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Old 11th September 2003, 07:50 PM   #2
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If you read the datasheet the reasons for the lack of projects based on this IC will soon become obvious.

ray.
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Old 11th September 2003, 09:11 PM   #3
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http://www.frenzic.speedlinq.nl/TDA1547_CNV_2.pdf
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Old 11th September 2003, 09:26 PM   #4
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Yes...?

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Old 11th September 2003, 09:59 PM   #5
frenzic is offline frenzic  Netherlands
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Actually, two DAC7's are combined in Philips SACD1000. I didn't really take the format serious yet for theoretical reasons so I don't know of any other "modern" applications for this dac. I do own three cdplayers using it. They are Philips cd950/951 so I would think there's Marantz's out there using it. As for the sonics, they are nothing to get excited about if you just have it plugged in. It needs, at least thats what my ears are telling me, about three weeks to "break in". Every time you unplug. In short when it's ready it handels the bitstream with authority. You are not listening to a machine, you enjoy the music. There is also a noticable wide dynamic range in contrast to an overall not so vibrant yet defined experience. Highs do not all sound alike and have depht to them. Since I have not had years of experience with CDM9 and the only players I own that use DAC7 also use CDM9, I cannot distinguish it's influence on the overall experience. I would like to combine a CDM4/19 and DAC7 to compare it to my all time favorite combo CDM4/19-TDA1543 using the same connectors, same style ps's and wiring, because I do kind of miss out on a certain punch in the bass dept. I think.
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Old 11th September 2003, 10:04 PM   #6
frenzic is offline frenzic  Netherlands
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"trying to find descriptions or tweaks, but came up emptyhanded."
"http://www.frenzic.speedlinq.nl/TDA1547_CNV_2.pdf"


Or wasn't the "Yes...?" about the latter?
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Old 11th September 2003, 10:17 PM   #7
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Quote:
will soon become obvious
This is definitely true. Marantz has already changed some CD player models from TDA1547 to Burr Browns (or, better: TIs).
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Old 11th September 2003, 10:28 PM   #8
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Default More info please...

Quote:
This is definitely true. Marantz has already changed some CD player models from TDA1547 to Burr Browns (or, better: TIs).
Probably because of the availability...and because all new constructions are smd...

I have seen that Philips / Marantz uses this DAC in top-line CD-players, and SACD-players, (also some Teac & Kenwood models).
But tweaking around the DAC is scarse, other than new analog part, trafos or ZapFilter.

The HDAM can ofcourse be discussed, but a change of op-amps from 2 x NJM2114 to OPA2604, and 4 x NJM5532 (smd) to AD825 has unleashed my CD-16. (And new DC-blocking caps).

Have sofar also changed all caps on digital/servo board to OsCons.

Arne K
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Old 11th September 2003, 10:38 PM   #9
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Marantz so far used TDA1547 in the CD-17 models and has now gone for two PCM1716 (mono mode). Everything else was nearly left unchanged. Marantz definitely said the changes are made because of the TDA leaving the scene.
BTW. The newer model sounds slightly better than the old one, especially if the "short" digital filter of the PCM1716 is selected.
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Old 12th September 2003, 12:06 AM   #10
frenzic is offline frenzic  Netherlands
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I might be a bit sentimental towards Philips IC's but I would like to know what exactly sounds better in the non Philips CD17. I can't believe not much needed to change when diff. mode dacs are being swapped for mono dacs. Nor can I believe that the original filter sounds better applied to a different DAC. Well that I can believe but it's imho not likely to occur.
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