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Old 12th November 2002, 07:25 PM   #1
skaara is offline skaara  Slovenia
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Default TI dacs

I heard that the pcm1738 is newer than 1704, does it sound better too?

What are the other good dacs from ti (besides pcm1704)?
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Old 12th November 2002, 07:39 PM   #2
jwb is offline jwb  United States
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The PCM1704 is an R2R one-channel DAC without a digital filter. The PCM1738 is a ΔΣ two-channel DAC with an integrated digital filter. On the principle of simplicty, I would assume the 1704 sounds better, although I have never heard the 1738.
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Old 12th November 2002, 09:43 PM   #3
skaara is offline skaara  Slovenia
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I asked because I got this from TI when asking about 1704:

"We do not recommend using this old audio D-A converter for new designs. Please use the PCM1738 audio D-A converter instead."
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Old 12th November 2002, 09:49 PM   #4
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They are pushing the '1738, but if you look at the difference in cost, well........draw your own conclusions as to which one sounds better.

The '1738 does have current output. From what I have been told, it is not much different than other delta-sigma types, except that they allow you to use external components to create the voltage output. The other types perform the I/V internally, and the voltage outputs are summed externally.

Jocko
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Old 12th November 2002, 09:51 PM   #5
jwb is offline jwb  United States
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Well the 1704 is their only production sign-magnitude DAC. Telling someone looking for a sign-magnitude DAC that they should use a delta-sigma DAC is a ******** move. They list the 1704 as in production but digi-key ran out of the high grades months ago.
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Old 12th November 2002, 09:53 PM   #6
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They claim that they will have more in December. The TI types I talk to say that they have been cutting back on fabs everywhere, and that we should be able to get them again soon.

So they say.......

Other suppliers have them, but charge much more.

Jocko
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Old 12th November 2002, 10:12 PM   #7
skaara is offline skaara  Slovenia
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And what are the other good dacs of TI?
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Old 13th November 2002, 03:53 AM   #8
weissi is offline weissi  Europe
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I have one, as soon I get a pcb Ill tell you more!
According to the datasheet it combines the advantages of a multibit converter with that one from a sigmadelta.......???
The only thing I can say is that it would be heavy nonsens to convert the voltage output of a real sigmadelta to current only for convert it outside to voltage.....
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Old 13th November 2002, 07:07 PM   #9
skaara is offline skaara  Slovenia
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Which one do you have, pcm1738?
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Old 14th November 2002, 05:18 AM   #10
weissi is offline weissi  Europe
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yes, its a PCM1738...... Waiting for the PCBs..... Hope they work, you know SSOP isnt the best to solder and to etch....

I will test it only with the standard application, should mean no hypermega OP627 or tubes, only NE5534. Currently Im only able to test it at 16bit/48kHz (cs8412)

AND: I have no comparision to other good DACs, currently I have PCM1716, WM8716, AD1855, TDA1541(standard) to wich I could compare it.
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