YBA CD2 DAC Chip Identification Help - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

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
Reply
 
Thread Tools Search this Thread
Old 4th July 2012, 08:43 PM   #1
diyAudio Member
 
Tubologic's Avatar
 
Join Date: Dec 2004
Location: Brussels
Default YBA CD2 DAC Chip Identification Help (SOLVED)

I'm currently working on a YBA CD2 player with a defective D/A converter chip on the analog output board. It's a 24-pin SMD package device mounted on the bottom side of the PCB, in position IC9.
Problem is that the manufacturer has carefully erased (sanded) all the markings and the chip is no longer identifiable. I contacted YBA by e-mail but (unsurprisingly) never got any reply. Now I'm stuck and can't repair the player due to this part identification issue. If anybody here has more accurate informations (no guesses please: there are many DAC's using the same package) about the exact type of DAC used in the CD2 it would be greatly appreciated.
Attached Images
File Type: jpg YBACD.1.jpg (123.2 KB, 127 views)
File Type: jpg YBACD.4.jpg (105.0 KB, 120 views)
File Type: jpg YBACD.2.jpg (119.6 KB, 118 views)
File Type: jpg YBACD.3.jpg (126.7 KB, 124 views)

Last edited by Tubologic; 8th July 2012 at 03:05 PM.
  Reply With Quote
Old 6th July 2012, 04:32 AM   #2
diyAudio Member
 
Join Date: Oct 2006
According to a review I found, this player came out back in 1993, claiming to have an 18bit dual dac. Being 28pin SOIC package, it is most likely an AD1865 or PCM1700. You can confirm if it is one of these by locating where the power supply pins are on the datasheet diagrams for each chip, versus where you find supply lines coming to the chip on board.
Incidentally, it looks more like the chip is painted, rather than sanded, so you might try a solvent like MEK to see if it will come off & reveal the number.
  Reply With Quote
Old 6th July 2012, 04:55 AM   #3
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: 99
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
The picture shows a 24pin SO package, not 28pin. I went to TI, Cirrus and AD's sites and searched for 24pin SOIC DACs with a long history, turned up no leads.
__________________
It doesn't have to take the form of a conspiracy, rather a consensus... James H Kunstler
  Reply With Quote
Old 7th July 2012, 08:43 PM   #4
diyAudio Member
 
Join Date: Oct 2006
Oh, heck, you're quite right. I somehow thought I read 28pin. And, yes, I am not seeing any 18bit dual dacs I can think of, off hand, that ever came in 24pin soic. YBA did allegedly claim it was a custom chip, but I find that extremely hard to believe.
  Reply With Quote
Old 8th July 2012, 01:32 PM   #5
maxpou is offline maxpou  Canada
diyAudio Member
 
maxpou's Avatar
 
Join Date: Apr 2006
Location: Québec
Hi,
I was really surprised, this is a sanyo chip. Send me a PM. Maxpou
  Reply With Quote
Old 8th July 2012, 03:01 PM   #6
diyAudio Member
 
Tubologic's Avatar
 
Join Date: Dec 2004
Location: Brussels
Quote:
Originally Posted by maxpou View Post
Hi,
I was really surprised, this is a sanyo chip. Send me a PM. Maxpou
Yes, I also received confirmation it's a SANYO (NOT Custom !!) dual 18bit D/A converter including 8fs oversampling filter. All the "customization" YBA made was to put a small adhesive copper foil on the chip (which I removed) and... sand off the markings to make it unidentifiable ! Thanks to all who helped. Problem solved.
  Reply With Quote
Old 9th July 2012, 01:52 AM   #7
diyAudio Member
 
Join Date: Oct 2006
Ah, makes some sense. I didn't even think of the LC78835, which is what it must be. Pretty cheap circuitry for such an overpriced player.
  Reply With Quote
Old 9th July 2012, 02:05 AM   #8
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: 99
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
I agree - can't see anything to recommend that chip. Compromised oversampling filter (43 taps in first stage) presumably to keep die size down?
__________________
It doesn't have to take the form of a conspiracy, rather a consensus... James H Kunstler
  Reply With Quote

Reply


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
Yba cd2 delta, classe cdp .3, roksan caspian ... main board franksmith Digital Source 29 27th November 2012 10:49 AM
Converting a Cambridge Audio CD2 to a stand-alone DAC? Tweedle12 Digital Source 3 28th November 2011 12:48 PM
For sale: Fully working dac board from Cambridge CD2 matski Swap Meet 1 20th November 2006 06:32 AM
Philips 303 With Cambridge Cd2 Dac metalmaster Digital Source 1 23rd September 2005 12:24 PM
Chip identification: AD42712 (desperate) Paul Terpstra Chip Amps 5 26th January 2004 08:46 PM


New To Site? Need Help?

All times are GMT. The time now is 02:34 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2