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Help with Graph on SSM2164 Datasheet
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dougcl



Joined: Feb 08, 2008
Posts: 33
Location: Portland OR

PostPosted: Thu Mar 31, 2016 5:21 pm    Post subject: Help with Graph on SSM2164 Datasheet Reply with quote  Mark this post and the followings unread

Hi folks, can someone help me understand Fig 6 from the SSM2164 datasheet?

I am thinking this should represent input signal levels vs. distortion, but apparently not, because we can't really be talking about thousands of volts rms, right?

Is this a copy and paste error from the previous figure? Are the axes all wrong?

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http://www.analog.com/media/en/technical-documentation/data-sheets/SSM2164.pdf


Plus the y axis values don't really line up with the specs here.
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varice



Joined: Dec 29, 2004
Posts: 961
Location: Northeastern shore of Toledo Bend
Audio files: 29
G2 patch files: 54

PostPosted: Sat Apr 02, 2016 12:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

It does look like something is wrong. The X axis range is 20 to 20k with a log scaling, which is how the audio frequency range is normally displayed. But there are other graphs of THD+noise vs Frequency. Maybe the wrong range of amplitude values are printed on the graph? But there is another problem. Right in the body of the graph is the specification Av=0dB, which would not make any since for a graph supposedly using a range of amplitude values. Confused That graph seems to be very messed up.
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dougcl



Joined: Feb 08, 2008
Posts: 33
Location: Portland OR

PostPosted: Mon May 09, 2016 3:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ha, I see people grousing about it on the SDIY mailing list here http://search.retrosynth.com/synth-diy/index.html
so it is a well-known problem.
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