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Mod for Oppo DV-980H: direct output from CS4361 DAC
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Old 2nd December 2017, 02:18 AM   #11
Andersonix is offline Andersonix  Sweden
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Mod for Oppo DV-980H: direct output from CS4361 DAC
It's Friday happy hour, so could you point me in the right direction?
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Old 2nd December 2017, 03:00 AM   #12
anatech is offline anatech  Canada
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Mod for Oppo DV-980H: direct output from CS4361 DAC
Hi Andersonix,
Show me the datasheet that recommends running the DAC straight to the outside world. Please.

-Chris
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Old 2nd December 2017, 04:12 AM   #13
Andersonix is offline Andersonix  Sweden
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The schematic in the OP is a screen capture of the Cirrus CS4361 datasheet Fig 6 "Recommended connection diagram" on page 11.
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Old 2nd December 2017, 02:05 PM   #14
anatech is offline anatech  Canada
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Hi Andersonix,
Thanks, found it.

Did you include the output network, and have you looked at the loading on the output? I would think that their concern over loading internally would go (at least) double for direct connection to the outside world! There are a few op amps that have lower distortion and noise than the DAC has. Properly implemented, they would very likely improve the sound quality.

One thing I find striking is the lack of a reconstruction filter. They say it has been implemented on the chip, but I would want to check this anyhow. At -94 dB S/N, there are a lot of op amps that would suite this chip and provide the ability to properly drive cable reactance and the following input stage. Often times an output buffer will improve the performance of the output circuit in the D/A by unloading it. Without such a buffer, the performance would certainly depend on the load, including cables. You can expect the high frequencies to suffer first, and this may actually be why you prefer that configuration.

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Old 5th December 2017, 01:29 AM   #15
Andersonix is offline Andersonix  Sweden
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Mod for Oppo DV-980H: direct output from CS4361 DAC
Quote:
Originally Posted by anatech View Post
Did you include the output network, and have you looked at the loading on the output?
Yes I added the two resistors and two caps as shown in the diagram, but no I haven't checked anything.
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Old 5th December 2017, 05:56 AM   #16
anatech is offline anatech  Canada
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Hi Andersonix,
Check best that you can. It would be interesting to see how much of a voltage drop there was when you connect this to the preamp. If you have a test CD with a constant tone, it would be easy to check. You would want to use either an AC voltmeter (not a DVM unless it was like an HP 34401A or equivalent), or an oscilloscope. One of the newer digital ones might be better in this case.

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