Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Opamps for PCM1794 I/V conversion?
Opamps for PCM1794 I/V conversion?
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 30th June 2020, 04:49 PM   #71
guentir is offline guentir  Austria
diyAudio Member
 
Join Date: Aug 2017
Location: Austria
Quote:
Originally Posted by Mark Tillotson View Post
So the desired opamp performance for I/V conversion is < 4pA/√Hz and < 3nV/√Hz, and < 0.0004% THD. LM4562 might be good bet here.
You´re right, in this application, the LM4562 & NE5532/4A is on par in terms of THD / Noise and (very) hard to beat.

To my surprise, the OPA1656 works very well in this i/v position, betters the 2 above about 2-3 dBFS.

cheers,
guenther

Last edited by guentir; 30th June 2020 at 04:52 PM.
  Reply With Quote
Old 1st July 2020, 06:33 AM   #72
samoloko is offline samoloko  Bulgaria
diyAudio Member
 
Join Date: Jun 2006
thank you for this application

Quote:
Originally Posted by PaulFrost View Post
Very cool board!

Here is a little tech note I wrote about the output stage of the PCM1794A. This mostly focuses on the gain balancing from the first and second stage. Another thing to consider is that you do not necessarily need symmetrical supplies for the first stage. The inputs stay at the virtual ground, so that stage does not really need a high voltage positive supply.

http://www.ti.com/lit/an/sbaa333/sbaa333.pdf
 

Reply


Opamps for PCM1794 I/V conversion?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Which dual opamps should I try for I/V conversion? homemade Digital Source 29 5th November 2016 06:10 AM
Decompensated opamp oscillating? Fried opamps? PCM1794 IV Stage zxgravediggerxz Digital Line Level 1 9th October 2013 03:40 PM
my DAC PCM1794 v9688 Digital Line Level 1 16th September 2013 10:06 AM
AF filter using opamps - substitution of opamps neazoi Solid State 19 5th October 2011 04:01 PM
FS: Power Chip OpAmps and other OpAmps & D to A Converter dtm1962 Swap Meet 4 12th January 2006 10:07 PM


New To Site? Need Help?

All times are GMT. The time now is 01:37 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki