Hi All,
In the near future DVD-A will probably be more popular than the 'older' audio CD. With DVD machine prices crashing it seems inevitable. DVD-A disc prices however may be the deciding factor.
For the DIY'ers , is there any chip that decodes 24 /96 as well as our old TDA1541A for 16/44.1 ? Basically that means is there any 24/96 chip equivalent to the TDA1541A in performance.
There aren't too many manufacturers and so the list of chips must be limited. Can anyone comment on a 'known good chip'.
Thanks.
Cheers.
In the near future DVD-A will probably be more popular than the 'older' audio CD. With DVD machine prices crashing it seems inevitable. DVD-A disc prices however may be the deciding factor.
For the DIY'ers , is there any chip that decodes 24 /96 as well as our old TDA1541A for 16/44.1 ? Basically that means is there any 24/96 chip equivalent to the TDA1541A in performance.
There aren't too many manufacturers and so the list of chips must be limited. Can anyone comment on a 'known good chip'.
Thanks.
Cheers.
This is of interest to me too
I am also looking for a really musical, but realistically simple DAC to accept SPDIF and I2S inputs to fit into a CDP/DAC/Preamp project.
I have looked at the data sheets for the PCM1704 from TI, and I think that that could be manageable, providing someone with more talent with me can design and manufacture PCBs based on the data sheet.
This is the DAC used in the latest NAIM players and by all accounts is a great piece of kit.
I am also looking for a really musical, but realistically simple DAC to accept SPDIF and I2S inputs to fit into a CDP/DAC/Preamp project.
I have looked at the data sheets for the PCM1704 from TI, and I think that that could be manageable, providing someone with more talent with me can design and manufacture PCBs based on the data sheet.
This is the DAC used in the latest NAIM players and by all accounts is a great piece of kit.
And in case your are new.....I really hate both of thoses parts.
how could we forget.....
Ashok,
I understand your question... as you can probably guess, I am in no position to give you an answer!!!
This exercise is so challenging, partly because swapping DACs in the same circuit may not give optimised results. I've been looking at replacing the DAC in my Marantz CD42 for years now, and am still no closer to coming up with a definitive answer e.g. does one go for transformer coupled outputs, tube buffers, 5th order bessel filters, GIC filters??? And that's just the output stage...
Sorry this has been such a useless answer, and good luck!
Arnie
I understand your question... as you can probably guess, I am in no position to give you an answer!!!
This exercise is so challenging, partly because swapping DACs in the same circuit may not give optimised results. I've been looking at replacing the DAC in my Marantz CD42 for years now, and am still no closer to coming up with a definitive answer e.g. does one go for transformer coupled outputs, tube buffers, 5th order bessel filters, GIC filters??? And that's just the output stage...
Sorry this has been such a useless answer, and good luck!
Arnie
Re: Since you may be new here......
You mean, you hate PCM1704 ?
I was considering using it... can you be more precise ? I don't want to waste time and money on something flawed...
thanks
Jocko Homo said:And in case your are new.....I really hate both of thoses parts.
Jocko [/B]
You mean, you hate PCM1704 ?
I was considering using it... can you be more precise ? I don't want to waste time and money on something flawed...
thanks
Re: Re: Since you may be new here......
If you search the forum you will find JH hates the SAA7220 and the TDA1541.
peufeu said:
You mean, you hate PCM1704 ?
I was considering using it... can you be more precise ? I don't want to waste time and money on something flawed...
thanks
If you search the forum you will find JH hates the SAA7220 and the TDA1541.
Hi ashok, Most modern DACs are backwards compatible meaning they can work on redbook CD's.ashok said:Hi All,
In the near future DVD-A will probably be more popular than the 'older' audio CD. With DVD machine prices crashing it seems inevitable. DVD-A disc prices however may be the deciding factor.
For the DIY'ers , is there any chip that decodes 24 /96 as well as our old TDA1541A for 16/44.1 ? Basically that means is there any 24/96 chip equivalent to the TDA1541A in performance.
There aren't too many manufacturers and so the list of chips must be limited. Can anyone comment on a 'known good chip'.
Thanks.
Cheers.
But to me it seems most manufacturers have taken the Delta-Sigma route. If that is sounding like TDA1541AS1?
By the way, I'de be interested in that thread too. I have built a DAV with TDA1545 which sounds fantastic, and a friend has very good results with AD1875 (which shows even more potential, maybe...)
So is there a chip that sounds as good as the good old Multibits, while taking 24-96 ?
There is PCM1704, never heard it though...
So is there a chip that sounds as good as the good old Multibits, while taking 24-96 ?
There is PCM1704, never heard it though...
Re: Whaddya mean......
So you mean you like 1704 a lot better than the other multibits, which quite answers my question. Now do you prefer AD1862 over it ?
Jocko Homo said:Go buy the '1704. If you think that it costs too much, buy a AD1862.
So you mean you like 1704 a lot better than the other multibits, which quite answers my question. Now do you prefer AD1862 over it ?
Re: Whaddya mean......
Jocko,
Many people feel the PCM63 was the best of all those BB
DAC's. We used the '63 and disabled bipolar offset internal
compenasation current (2mA) and found significant improvement.
This is a worry WRT the 1704 as you can't disable it. However
the 1704 does measure slightly better. Have you done direct
comparison with 63 and 1704???
What DF did you use, we used PMD100 (HDCD) and now are
looking at running 63 in 0 x OS
The PMD100 has great detail and resolution but I think it
may be a bit unmusical. I remember trying DF1704 and there
was mixed opinion compared to PMD100..... it's a can of worms!
Terry
Jocko Homo said:"As good as the (good) old multibit"?
Who ever said that they sound good?????? Not me.
Go buy the '1704. If you think that it costs too much, buy a AD1862.
Jocko......(who has both.....and the $$$$ tied up in surplus inventory to prove it.)
Jocko,
Many people feel the PCM63 was the best of all those BB
DAC's. We used the '63 and disabled bipolar offset internal
compenasation current (2mA) and found significant improvement.
This is a worry WRT the 1704 as you can't disable it. However
the 1704 does measure slightly better. Have you done direct
comparison with 63 and 1704???
What DF did you use, we used PMD100 (HDCD) and now are
looking at running 63 in 0 x OS
The PMD100 has great detail and resolution but I think it
may be a bit unmusical. I remember trying DF1704 and there
was mixed opinion compared to PMD100..... it's a can of worms!
Terry
Re: Re: Whaddya mean......
What did you use for IV conversion ? A simple resistor ?
Maybe the internal current source did not like the variations in output voltage caused by the resistor ?
I think the Folded Cascode circuit is much superior to a simpel resistor...
Terry Demol said:
Many people feel the PCM63 was the best of all those BB
DAC's. We used the '63 and disabled bipolar offset internal
compenasation current (2mA) and found significant improvement.
What did you use for IV conversion ? A simple resistor ?
Maybe the internal current source did not like the variations in output voltage caused by the resistor ?
I think the Folded Cascode circuit is much superior to a simpel resistor...
Folded cascode
Thanks to all for your replies.
Hi Peufeu,
Can you post your folded cascode design ? I can build it and compare it with my resistor loaded TDA1541 output. I have been looking for alternative solutions but never could decide on one. I also agree that the ideal situation would be to have a virtual zero ohm load at the current output .My load is 50 ohms but might make an audible difference if that was a virtual zero. Reducing the load to 10 ohms would be throwing away precious signal.
Will be waiting to see your folded cascode solution.
Cheers.
Thanks to all for your replies.
Hi Peufeu,
Can you post your folded cascode design ? I can build it and compare it with my resistor loaded TDA1541 output. I have been looking for alternative solutions but never could decide on one. I also agree that the ideal situation would be to have a virtual zero ohm load at the current output .My load is 50 ohms but might make an audible difference if that was a virtual zero. Reducing the load to 10 ohms would be throwing away precious signal.
Will be waiting to see your folded cascode solution.
Cheers.
Well, it's not exactly "mine" (Rudolf Broertjes and I thought about it as the same time) but here it is :
link
Try the third version. I have not tried it yet, but the PCBs are ordered already... want an Eagle file for your PCB ?
With it you can use 1k load and get more signal !
link
Try the third version. I have not tried it yet, but the PCBs are ordered already... want an Eagle file for your PCB ?
With it you can use 1k load and get more signal !
Re: Re: Re: Whaddya mean......
Jocko,
We went away from R I-V years ago because the '63 has more
distortion with increased OP compliance. You can directly
compare this by using a good OPA I-V with something like a
627 and add varying resistance in front of it to simulate an R
I-V. The '63 starts to change it's sound with as little as 15R.
WRT Folded Cascode topology, I agree. We have built many of
those cascode I-V's in various topologies with Jfets, BJT's MOS,
complementary, SE, folded, CFP, non CFP, etc etc.
However to answer your question, when we first checked the BPO
phenomenom it was with discrete CFB opamp I-V (closed loop).
There was no voltage swing at dac OP, and it still degraded the
sound, quite strange.
Terry
peufeu said:
What did you use for IV conversion ? A simple resistor ?
Maybe the internal current source did not like the variations in output voltage caused by the resistor ?
I think the Folded Cascode circuit is much superior to a simpel resistor...
Jocko,
We went away from R I-V years ago because the '63 has more
distortion with increased OP compliance. You can directly
compare this by using a good OPA I-V with something like a
627 and add varying resistance in front of it to simulate an R
I-V. The '63 starts to change it's sound with as little as 15R.
WRT Folded Cascode topology, I agree. We have built many of
those cascode I-V's in various topologies with Jfets, BJT's MOS,
complementary, SE, folded, CFP, non CFP, etc etc.
However to answer your question, when we first checked the BPO
phenomenom it was with discrete CFB opamp I-V (closed loop).
There was no voltage swing at dac OP, and it still degraded the
sound, quite strange.
Terry
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