fastest pure-PCM DACs

[el`Ol]

Hello all!

How fast are the fastest pure PCM-DACs,
for 8 Bit, 12 Bit, 16 Bit, 20 Bit, 24 Bit?


Oliver

 

[Archwn]

192kHz?

 

[flshzug]

24bit : )))))))))) , for real : 16 bit 600 MSPS

 

[el`Ol]

Are these AD beasts all pure PCM?
And is highspeed >16bit not possible, or is there just no market?

 

[flshzug]

I used to check if TI wantsto release some new r2r with SiCr thin film and I out , but nothing yet.

 

[flshzug]

pcm1704 is already high speed capable of 16x os

 

[b-square]

The PCM1704 and the WM8740 (and probably others) have 8xFs modes for use with an external digital filter. In 8x mode they accept 768kHz sample rate, 24-bit samples. Neither chip is upsampling in this mode; that is assumed to have been done by the external filter, like the DF1704.

 

[el`Ol]

I remember the Wadia Power DAC that reached 2.8Mhz with eight of them driven phase-shifted many years ago. Any progress so far? And what about ADCs?

 

[Nanook]

PCM63...

slaughters the newer versions....

at least in my humble opinion

stew

 

[rfbrw]

The PCM1704 and the WM8740 (and probably others) have 8xFs modes for use with an external digital filter. In 8x mode they accept 768kHz sample rate, 24-bit samples. Neither chip is upsampling in this mode; that is assumed to have been done by the external filter, like the DF1704.

The PCM1704 has no interrnal filter.

 

[el`Ol]

Re: PCM63...

PCM63...

slaughters the newer versions....

at least in my humble opinion

stew

So maybe ultra-high resolution pure-PCM is not uncritical?

 

[flshzug]

pcm63 is segmented dac, made out of smaller r2r blocks. Maybe 18bit "pure pcm" is possible with TI 's SiCr thin film process. They claim 8piece 16bit r2r on single IC is now possible with their advanced SiCr resistors.

 

[el`Ol]

And the AD highspeed DACs? Are they pure PCM (zero oversampling, zero delta-sigma)?
http://www.analog.com/IST/SelectionTable/?selection_table_id=338

 

[b-square]

The PCM1704 has no interrnal filter.

I didn't say otherwise.

 

[rfbrw]

I didn't say otherwise.

It could be inferred that you did.

 

[el`Ol]

I think I have to explain why I ask for highspeed PCM DACs in an audio forum. Quite a weird idea: If one tacted the DAC of a sample player with an analog VCO (variable frequency) one wouldn´t have to care about anti-aliasing and get a much fatter sound. In an online document from AD they describe architectures of highspeed DACs. They are segmented, but not delta-sigma. So there are at least 16-bitters in any desired speed.
Can this principle be realized?

 

[b-square]

it is unclear what you are asking.

 

[el`Ol]

It´s about musical instruments. A 1702 would only allow a three-octave shift of a 96kHz sample by tact rate variation (assumed this is possible).