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A nice dac to complement the Aleph-X.
A nice dac to complement the Aleph-X.
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Old 3rd November 2003, 01:13 PM   #101
vit is offline vit  Sweden
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Is it possible to use the D1 output stage with a pair of pcm1794 running i mono mode?
The pcm1794 is a stereo dac with differential current output (7.8 mA p-p)
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Old 6th November 2006, 07:57 PM   #102
audiodesign is offline audiodesign  Italy
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Send a message via MSN to audiodesign A nice dac to complement the Aleph-X.
Someone could sell me some PCM1704 and DF1704 ?

A. Ciuffoli
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Old 7th November 2006, 09:13 PM   #103
hifimaker is offline hifimaker  United States
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Digikey has a big selection:


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Old 24th June 2011, 02:24 PM   #104
tiefbassuebertr is offline tiefbassuebertr  Germany
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Originally Posted by Nelson Pass View Post
What is interesting about the D1 I/V (besides it being the
only part of the circuit I participated in) is that it simply
cascodes the output of the DAC, the output being a current
source looking for a virtual ground. Thus, it contributes
almost no noise or distortion, and is unbelievably immune
to high frequency (RF) modulation and has no feedback
(just for sex appeal).

Why didn't anybody think of this before? Hell if I know.
It is an obvious thing in retrospect, but nobody seems to
have picked up on it. I blame the educational system for
cranking out "digital only" design engineers.

This question I also ask myself. Even by the successor of PCM63P/1702, the PCM1704 I don't find in commercial products like DENON such an I/U stage.
Only still integrated OP-AMP solutions I know.
In this case this URL's are of interest:
also the AES paper
"Current-steering transimpedance amplifiers for high-resolution
digital-to-analogue converters"
(M.O.J. Hawksford)

BTW - what I must consider, if I want to combine your IV topology with the PCM1704 ??

Last edited by tiefbassuebertr; 24th June 2011 at 02:33 PM.
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Old 19th September 2011, 12:30 PM   #105
samoloko is offline samoloko  Bulgaria
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Originally Posted by pquadrat View Post
This is the PCB.
The project was more a "proof of concept" and a test if I can get it running, not to be the ultimate DIY DAC. But i tried to use most information and tips I found, except about special oscillator circuits. Just one thing at a time

Short description: optical receiver TORX176, receiver TI DIR1703 switchable between coax and optical input, next step is the Analog Devices AD1896A Sample rate converter to upsample to 96kHz. It feeds the TI DF1706 digital filter to drive four PCM1704 DACs for balanced output. I/U Conversion is PASS D1.
Voltage regulation for digital part (3.3V, +- 5V) is on board, +-30V for output stage has to be supplied. I use one of my ONO power supply boards, which gives a nice regulated +-30V.
There are two errors in the layout. one trace between the two rectifier bridges has to be cut, and I forgot to place the output caps of the D1 stage. But otherwise it seems to work nice, and it sounds fine.
would anyone post schematic ?
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