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Opamps for PCM1794 I/V conversion?
Opamps for PCM1794 I/V conversion?
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Old 30th June 2020, 04:49 PM   #71
guentir is offline guentir  Austria
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Join Date: Aug 2017
Location: Austria
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.


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

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.



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