Re: Re: Re: Abracadabra
It really wasn't my intention. The point is that if the 1955 is indeed such a great dac all you need is a cheap pre-programmed micro chip in the post 🙂 It is of course frustrating no to be able to just solder it into an existing design...
QSerraTico_Tico said:
It really wasn't my intention. The point is that if the 1955 is indeed such a great dac all you need is a cheap pre-programmed micro chip in the post 🙂 It is of course frustrating no to be able to just solder it into an existing design...
Does anyone know of any diy DAC kits that use the AD1955?
I am happy to stuff a PCB and add power supplies etc, but that is the limit of my ability for the time being.
I would like to compare an upsampling DAC with my NOS DAC(Monica2).
TIA.
Michael
I am happy to stuff a PCB and add power supplies etc, but that is the limit of my ability for the time being.
I would like to compare an upsampling DAC with my NOS DAC(Monica2).
TIA.
Michael
In case you're interested in a PCM1794 upsampling DAC, I'm doing an interest check before I order more boards (for my ezdac):
http://ezdiyaudio.informe.com/viewtopic.php?t=32
http://ezdiyaudio.informe.com/viewtopic.php?t=32
Re: Re: Re: Re: Abracadabra
IMHO the registers can be set by hardware logic + reset circuit.
I did that with an os filter that needs registers set and it worked.
analog_sa said:
IMHO the registers can be set by hardware logic + reset circuit.
I did that with an os filter that needs registers set and it worked.
gaetan8888 said:
IMHO sound quality is going up when os rate is going down.
All the new chips have high os rates.
PCM56 non os, passive I/V, passive brickwall filter, op amp line driver is my favorite.
What is true about the new chips is that low level distortion performance is very good plug and play.
QSerraTico_Tico said:
Not that severe,
I did measurements and simulations and you have no square waves in reality.
Even more os filters suffer from pre-ringing.
Bernhard said:
YES, I found Bessel or passive low-pass filters (NOT brickwall) have no ringing and better sound
Re: Re: Re: Abracadabra
I also have an Analog Devices AD1853 and 1854 eval board. They are really nice DAC's, but the AD1955 has a lot more dynamic range.
-David
QSerraTico_Tico said:
I also have an Analog Devices AD1853 and 1854 eval board. They are really nice DAC's, but the AD1955 has a lot more dynamic range.
-David
QSerraTico_Tico said:
Similar results in my work as well. Sometimes an active low-pass filter is better since it can also act as a driver. Surprising how many DAC's are output cable sensitive, and then come to find they have passive outputs.
-David
Hello
How about adapting a Linkwitz-Riley alignment and phase coherent filter to a Dac, is it better than Bessel type filters ?
Here's the link to a Linkwitz-Riley filter;
http://sound.westhost.com/project09.htm
For myself I think to use a TDA1541 in a non-os Dac, but with an op amp for the I/V , and a CS8414 for the receiver.
Any plans that you know for that ?
Gaetan
How about adapting a Linkwitz-Riley alignment and phase coherent filter to a Dac, is it better than Bessel type filters ?
Here's the link to a Linkwitz-Riley filter;
http://sound.westhost.com/project09.htm
For myself I think to use a TDA1541 in a non-os Dac, but with an op amp for the I/V , and a CS8414 for the receiver.
Any plans that you know for that ?
Gaetan
Hi gaetan,
The term "phase coherent" only makes sense in the context of crossovers. In the case of the L-R crossover, it means that the high pass and the low pass electrical outputs are in phase to each other at the cut frequency. This doesn´t mean that the filter doesn´t distort phase.
What you probably want is a phase linear or minimal phase filter, that is indeed suitable for low pass after the dac. A second order bessel alignment is often used, as it´s effective and not too far from linear.
Cheers to all.
Alexandre
The term "phase coherent" only makes sense in the context of crossovers. In the case of the L-R crossover, it means that the high pass and the low pass electrical outputs are in phase to each other at the cut frequency. This doesn´t mean that the filter doesn´t distort phase.
What you probably want is a phase linear or minimal phase filter, that is indeed suitable for low pass after the dac. A second order bessel alignment is often used, as it´s effective and not too far from linear.
Cheers to all.
Alexandre
Hi gaetan,
For a tda1541 DAC like you ask look at this kit:
http://www.pedjarogic.com/1541a/index.html
You should also take a peek at this one if you haven't already seen it:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=79452&perpage=25&pagenumber=1
For a tda1541 DAC like you ask look at this kit:
http://www.pedjarogic.com/1541a/index.html
You should also take a peek at this one if you haven't already seen it:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=79452&perpage=25&pagenumber=1
Alexandre said:
Hello
I found that link
http://www.omega.ntnu.no/~kamben/hwb/mi_ActiveFilterBessel2L.html
And also the software FilterPro from Ti.com
Gaetan
Brent Welke said:
Hello
I did see the www.pedjarogic.com, but how can he go up to 60mhz clock, since the clock give the time reference to the cd bit output, is it not changing the reference ?
Thank
Gaetan
DW8083
Can the Analog Devices AD1955 Eval board be used as a stand alone dac (with a suitable power supply) or does it need any extra stages?
ezkcdude
Your ezdac looks good too. I may go this way, especially since one of your customers has kindly supplied a Euro BOM.
This should be very interesting (comparing one of these two with my NOS DAC). I can envision having both in one case with some input and output selectors. No doubt one DAC would become rapidly redundant, but facinating nonetheless.
Can the Analog Devices AD1955 Eval board be used as a stand alone dac (with a suitable power supply) or does it need any extra stages?
ezkcdude
Your ezdac looks good too. I may go this way, especially since one of your customers has kindly supplied a Euro BOM.
This should be very interesting (comparing one of these two with my NOS DAC). I can envision having both in one case with some input and output selectors. No doubt one DAC would become rapidly redundant, but facinating nonetheless.
AD 1955 eval board available at Digikey
I looked into the availability of the AD 1955 evaluation board, AD gave me a list of authorized distributers.
Arrow 1-800-777-2776
Avnet 1-800-332-8638
DigiKey 1-800-344-4539
Newark in One 1-800-463-9275
It's pretty pricey I found it for $255.00 at Newark in One.
I looked into the availability of the AD 1955 evaluation board, AD gave me a list of authorized distributers.
Arrow 1-800-777-2776
Avnet 1-800-332-8638
DigiKey 1-800-344-4539
Newark in One 1-800-463-9275
It's pretty pricey I found it for $255.00 at Newark in One.
I have found the Analog Devices AD1955 Eval board at digikey $225 - I think.
Please can you confirm whether it can be used as a standalone DAC (with a suitable power supply), or whether it needs extra stages to be added.
TIA
Please can you confirm whether it can be used as a standalone DAC (with a suitable power supply), or whether it needs extra stages to be added.
TIA
dublin78 said:
Hi Tia,
The AD1955 eval board works standalone with the addition of +-12vdc PSU's. You can optionally connect a PC/notebook to the board to program the registers of the DAC for your own configuration settings. This eval board has balanced and SE audio out, and S/PDIF, AES, and TOS inputs. At $225, the board is very inexpensive given the performance. $225 is a lot, but cheap as compared to the performance.
You can also attach the Blackfin BF537 EZKit for a DSP upstream from the DAC. The BF537 includes ethernet and a tcpip stack to stream music from a PC. I'm experimenting with this setup now.
-David
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