Burr Brown PCM1792 vs. DSD1792 - what's the difference? - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 7 Old 01-22-2008, 09:50 AM - Thread Starter
AVS Special Member
 
dobyblue's Avatar
 
Join Date: Apr 2006
Location: CANADA
Posts: 1,868
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 13
I see that Burr Brown have a DSD1792 and a PCM1792 chip, but from the specifcations both of them seem identical.

The model would suggest that the DSD1792 also decodes DSD natively to analog, but with the clock speeds that the chip supports that doesn't seem possible.

Are they one and the same?

DSD1792 - http://www.tranzistoare.ro/datasheets/560/282843_DS.pdf
PCM1792 - http://www.ortodoxism.ro/datasheets2...0669wyw9cy.pdf

Do you need the DSD1700 to get true DSD to analog conversion? The DSD1700 chip has a clock speed of 11.2896 MHz.

DSD1700E - http://www.tranzistoare.ro/datasheets/105/217336_DS.pdf

If the DSD1700 is one of the only ways to get true DSD to analog conversion, are there any receivers that support this chip that also support TrueHD and dts-HD Master Audio?

The DSD1700 and DSD1700E are the only Burr Brown DAC's I can see listed that support "Direct transfer of DSD data stream to analog output signal"
dobyblue is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 01-22-2008, 10:00 AM
AVS Addicted Member
 
MichaelJHuman's Avatar
 
Join Date: Nov 2006
Location: Colorado Springs, CO
Posts: 18,929
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 228 Post(s)
Liked: 116
Even if a device has a chip that doesn't require an intermediate conversion step (to PCM I guess,) wouldn't it be a correct statement that a pre amp/receiver could use a chip that supported converting DSD directly to analog but didn't take advantage of it?

I looked at my Yamaha RX-V2700 manual, and it specifically states that it does a conversion to PCM. You may want to look at the manual for the device in question in case it makes a similar statement.

"But this one goes up to 11"
MichaelJHuman is offline  
post #3 of 7 Old 01-22-2008, 11:30 AM - Thread Starter
AVS Special Member
 
dobyblue's Avatar
 
Join Date: Apr 2006
Location: CANADA
Posts: 1,868
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 13
I can see that the PIoneer Elite's also convert DSD to PCM in the receiver and I'm sure they're using the PCM1796 DAC's.

I'm curious to find out though as some receivers aren't specific about what happens to DSD in the receiver (TX-NR905 and 4308CI for instance) whether or not the DSD1792 and PCM1792 chips are only capable of DSD to PCM to analog, rather than DSD to analog which the DSD1700 is definitely capable of, but doesn't appear to be in any current receivers that I can find.

Does anyone know of a site that might have more info into this level of technicality?
dobyblue is offline  
post #4 of 7 Old 01-22-2008, 07:09 PM
ekb
AVS Special Member
 
ekb's Avatar
 
Join Date: Aug 2001
Location: Lawrenceville, NJ
Posts: 4,186
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 11
Looks like Burr-Brown was bought by TI. If you go to their web site you can download the data sheets for these 2 devices. They look very similar but there are differences. Basically the DSD device handles both DSD and PCM, the other just PCM.

Ed
ekb is offline  
post #5 of 7 Old 01-22-2008, 07:27 PM
AVS Special Member
 
fyzziks's Avatar
 
Join Date: May 2007
Location: Altadena, CA
Posts: 1,512
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by ekb View Post

Looks like Burr-Brown was bought by TI. If you go to their web site you can download the data sheets for these 2 devices. They look very similar but there are differences. Basically the DSD device handles both DSD and PCM, the other just PCM.

Ed

No, they both handle PCM and DSD - what it looks like is the DSD 1792 has a serial control interface which the PCM 1792 lacks. They both have the TDMCA control interface.
fyzziks is offline  
post #6 of 7 Old 01-23-2008, 09:42 AM - Thread Starter
AVS Special Member
 
dobyblue's Avatar
 
Join Date: Apr 2006
Location: CANADA
Posts: 1,868
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 13
But if neither has a clock speed which is a multiple of 2,822,400 Hz then they're not doing a full conversion correct?

The only chip I see with a clock speed of this or higher is the DSD1700 which has a clock speed of 11,289,600 Hz.
dobyblue is offline  
post #7 of 7 Old 01-23-2008, 09:58 AM
AVS Special Member
 
fyzziks's Avatar
 
Join Date: May 2007
Location: Altadena, CA
Posts: 1,512
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by dobyblue View Post

But if neither has a clock speed which is a multiple of 2,822,400 Hz then they're not doing a full conversion correct?

The only chip I see with a clock speed of this or higher is the DSD1700 which has a clock speed of 11,289,600 Hz.

Look at page 2 of the data sheet, under Electrical Characteristics,Data Format (DSD Mode) - it shows the min clock speed of 2.8224 MHz, with a max of 11.2896 MHz. Both 1792 chips do DSD processing just fine.
fyzziks is offline  
Reply Receivers, Amps, and Processors

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off