Replacing pcm1796 with pcm1795 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 2nd July 2010, 07:41 PM   #1
adid is offline adid  United States
diyAudio Member
Join Date: Dec 2008
Default Replacing pcm1796 with pcm1795

Hello everyone, I want some expert opinions on swaping a PCM1796 with a PCM1795, as i read on TI specs sheet, both are the same pin configuration and pin by pin compatible, the only difference is that the PCM1795 is 32 bit DAC, I am thinking do this mod to the SONY XA-5400ES SACD PLAYER.
  Reply With Quote
Old 3rd July 2010, 04:23 AM   #2
diyAudio Member
abraxalito's Avatar
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 145
Send a message via Yahoo to abraxalito
I've just pulled up the two datasheets side by side on my monitor (its widescreen). The two parts look identical - even the plots of noise are indistinguishable. Given there's only 16 bits on a CD, the difference between 24 and 32bits in the DAC is pure marketing. I suggest finding an upgrade which is going to make a sonic difference and doesn't require desoldering and re-soldering a fine-pitched chip.

<edit> - the giveaway is on page 53 of the PCM1795 datasheet - see if you can spot the intentional mistake
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello

Last edited by abraxalito; 3rd July 2010 at 04:31 AM.
  Reply With Quote
Old 5th July 2010, 12:36 PM   #3
diyAudio Member
Joe Rasmussen's Avatar
Join Date: Jan 2003
Location: Sydney, Australia
I would love to know if this works.

Joe R.
The "Elsinore Project" DIY Speaker System " & DIY "Trans-Amp" - 40 Watt Transconductance Amp
Soon: High Frequency Bias in Tube OPT - "Don't take anything I say as an affirmation but as a question."
  Reply With Quote
Old 5th July 2010, 10:53 PM   #4
diyAudio Member
Join Date: Jan 2008
Location: Virginia
I think the the only change in 1795 is the input buffer. Was made large, compatible with 32 bit so it would accept that with no confusion. But right after that, it gets truncated to 24 bit and runs in the same pathway like on the 1796.
So... unless you have a DSP or other device outputting 32 bit (and no flexibility to change it to 24 bit) ahead of DAC, it is pointless to go this route. There is no quality improvement whatsoever.
PS: To mod a DSD player with that would be pointless from other reason too - DSD signal is 1 bit, has nothing to do with 32 bit PCM.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
PCM1796 or DSD1796 macboy Digital Source 5 27th April 2017 06:27 AM
My first DAC, CS8415/PCM1796 based DragosB Digital Source 6 2nd November 2006 03:58 PM
Replacing a diaphragm andyshriver Multi-Way 0 23rd October 2005 02:08 AM
Replacing Valves Tom Smithson Tubes / Valves 1 19th October 2004 02:20 AM
Replacing Chip soundNERD Chip Amps 3 9th February 2004 08:40 AM

New To Site? Need Help?

All times are GMT. The time now is 03:29 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2