Anyone used a PCM1794A with balanced output? - diyAudio
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Old 1st March 2006, 07:07 PM   #1
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Question Anyone used a PCM1794A with balanced output?

Has anyone tried using a single PCM1794A with it's balanced outputs connected to a Pass I/V stage?

Looking at the TI app notes, they recommend op amps for the I/V stage and as an unbalanced to balanced converter.

http://focus.ti.com/lit/ds/symlink/pcm1794a.pdf -page 18

Probably no problem using the Pass D1 I/V circuit, but can the unbalanced to balanced converter be omitted and the I/V circuit connected directly to a set of right and left xlr connectors?

Does anyone have experience with this chip driving balanced outputs?

I'm open to other chip recommendations.

Thank you,

-David
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Old 1st March 2006, 11:38 PM   #2
BerntR is offline BerntR  Norway
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Default I've done it with a PCM 1702

I've done this with a PCM 1702. Inside a Denon DCD S10. As part of an upgrade I bypassed the stock analoge stage and connected a Zapfilter from LCaudio. This buffer allows current or voltage input, balanced or unbalanced. So I hooked this directly on the DAC output using the balanced current input configuration. It worked well and still does several years after.
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Old 4th March 2006, 07:32 PM   #3
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Has anyone built a DAC with the 1794?

-David
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Old 6th March 2006, 06:27 AM   #4
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It's OK,even only use positive one with i/v and lpf as a single-ended output has no problem,the Thd and s/n maybe a little difference
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Old 16th March 2006, 05:35 PM   #5
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There are a lot of people using TDA1543 & TDA1541 DAC chips. I wonder why more people are not using the PCM1792 or PCM1794 chips?

-David
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Old 17th March 2006, 06:03 AM   #6
cetoole is offline cetoole  United States
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Quote:
Originally posted by dw8083
There are a lot of people using TDA1543 & TDA1541 DAC chips. I wonder why more people are not using the PCM1792 or PCM1794 chips?

-David
Personal preferance for the NOS sound, philisophical reasoning that doing less to the signal sounds better (KISS), availibility of existing designs, or maybe because it is a hell of a lot easier to solder DIP than SSOP. I havnt build a dac with either yet (its on my to-do list), but those are the reasons I can see.
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Old 17th March 2006, 09:26 AM   #7
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Quote:
I wonder why more people are not using the PCM1792 or PCM1794 chips
I can't solder the bloody PCM1794 chips. But I have a RAKK DAC that uses the PCM1794. (Passive version) The balanced output is of the DAC is converted to unbalanced by a transformer.

www.kandkaudio.com

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Old 17th March 2006, 04:05 PM   #8
gmarsh is offline gmarsh  Canada
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Quote:
Originally posted by dw8083
Has anyone built a DAC with the 1794?

-David
I've built a combo DAC/headphone amp using the 1792. I'm pleased as punch with the sound, and the Audio Precision at work is fond of it too.

SSOPs aren't that hard to solder. I use a homemade miniwave tip on my Hakko 936 station with separate flux. Lay flux, place chip, wipe the tip past the pins and you're in business.
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Old 18th March 2006, 02:34 AM   #9
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Hi gmarsh,

Would you happen to have a link to a schematic for your DAC or know where to get design ideas? I've found a lot of articles on unbalanced designs, but there is little published on balanced designs.

Thank you,

-David
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Old 18th March 2006, 01:11 PM   #10
Lyra is offline Lyra  Norway
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Default Re: Anyone used a PCM1794A with balanced output?

Quote:
Originally posted by dw8083
Has anyone tried using a single PCM1794A with it's balanced outputs connected to a Pass I/V stage?

Looking at the TI app notes, they recommend op amps for the I/V stage and as an unbalanced to balanced converter.

http://focus.ti.com/lit/ds/symlink/pcm1794a.pdf -page 18

Probably no problem using the Pass D1 I/V circuit, but can the unbalanced to balanced converter be omitted and the I/V circuit connected directly to a set of right and left xlr connectors?

Does anyone have experience with this chip driving balanced outputs?


Thank you,

-David
Not sure if I understand Your question here !?
The D1 shoud be able to convert the signal coming from the pcm1794, but this chip put out a "little" bit more current than the original D1-dac (PCM63...). Think there are some values that had to be altered, but don't know which.
When it comes to balanced mode...the D1 IV is born balanced...and so is the PCM1794...!?

Lyra
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