How good is PCM54? - 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 17th September 2007, 07:53 PM   #1
mudihan is offline mudihan  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Texas
Default How good is PCM54?

How good is it soundwise? Especially it's Voltage Out? I am considering buying an old cd player with this chip and use its voltage out directly for sound (feed it to a 10k stepped attenuator).

Thank you!
  Reply With Quote
Old 17th September 2007, 08:10 PM   #2
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
PCM54 is like most other multibit DACs, 10% of them are good.
I think it has Iout so passive I/V or external I/V with modern opamp is possible. The player should have a pair and not only one...
  Reply With Quote
Old 17th September 2007, 10:25 PM   #3
mudihan is offline mudihan  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Texas
So using the Vout directly is not as good as using the Iout with modern op amps -- It makes sense since op amp inside the chip is not comparable to the modern ones.

As for a passive I/V, with regard to PCM54, what value of resistor should I use? Thank you!
  Reply With Quote
Old 17th September 2007, 11:02 PM   #4
mudihan is offline mudihan  United States
diyAudio Member
 
Join Date: Jan 2004
Location: Texas
Also, would I need a buffer inbetween this passive i/v stage and my 10k stepped attenuator (is the voltage after the i/v stage strong enough, with regard to PCM54)? Thanks again!
  Reply With Quote
Old 18th September 2007, 10:08 AM   #5
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Quote:
Originally posted by mudihan

As for a passive I/V, with regard to PCM54, what value of resistor should I use? Thank you!
500 ohm is a good starting point.
You could use a pot and check for distortion.
  Reply With Quote
Old 18th September 2007, 10:09 AM   #6
diyAudio Member
 
Bernhard's Avatar
 
Join Date: Apr 2002
Location: Munich
Quote:
Originally posted by mudihan
Also, would I need a buffer inbetween this passive i/v stage and my 10k stepped attenuator (is the voltage after the i/v stage strong enough, with regard to PCM54)? Thanks again!
A buffer with some gain after the filter.
  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
Good general purpose opamp with good DC specs? speakerguy79 Parts 1 17th November 2006 05:10 AM
Any PCM54/55 type chips and R2R ladders out there ? percy Digital Source 8 3rd November 2006 02:57 AM
Good switch for Stepped attentuater, Good cheap RCA jacks pjpoes Parts 20 10th March 2005 09:47 PM


New To Site? Need Help?

All times are GMT. The time now is 09:53 AM.


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