[JahJahBinks]

Right now I've seen people mentioning AD1852, CS4398 and PCM1794 for the new DAC. I was doing some literature reading and found this DAC:
http://www.wolfsonmicro.com/products...io/dacs/WM8740

Here's the article on it: http://www.edn.com/article/CA426064.html (scroll towards the end)

Just offering some ideas to this community.

 

[JJ15k]

Looks nice, thanks!
How are your projects going?

 

[JahJahBinks]

what projects are you referring to?

 

[JJ15k]

I thought I saw a post from you about usb transports and I also figured that you could have other stuff going on........

 

[JahJahBinks]

well, it's not for audio though.

Just something I learned at work and share it with people here.

 

[Garbz]

But in the end it's still a Delta Sigma DAC and not a true multi bit type like the PCM1704.

 

[Nerull]

Curious, I am towards DACs. I know now how to implement them, but I have no idea on the actual technologies in them. What exactly makes a multi-bit DAC better than a Delta-Sigma DAC (not just sound quality-wise, but the actual differences between the two)?

~Tom

 

[JahJahBinks]

Quote:

Originally Posted by Garbz But in the end it's still a Delta Sigma DAC and not a true multi bit type like the PCM1704.

But did you realize it is not like any other Delta Sigma DAC? Please read: http://www.wolfsonmicro.com/uploads/...whitepaper.pdf

Nerull, you should read this article too.

 

[Garbz]

Ahh true. It's a fully 24bit dac with a Delta-Sigma modulator bolted on the front. I wonder how this will sound.

Nerull I'm not entirely sure if this is accurate, but I think Delta Sigma and Advanced Segment DACs run the input through a digital interpolation filter then it's run through it's Delta Sigma DAC process where it approximates the output by using a series of segments, sums them together on the output, then integrates and compensates the resulting error using some kind of digital feedback. They are often single bit I believe with the DS modulator controlling what the output actually does and the DAC simply pushing the signal higher or lower.

Multibit dacs I think even in hifi are like R2R ladders. Each bit is assigned a certain value which is summed at the output. All 24 bits are pushed into the dac at the same time and each takes a different path. The resulting output is a true representation of the 24bits of data the dac receives. And most I've seen have external digital interpolation filters.