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???
06/06/07 18:02
Modified:
  06/06/07 18:03
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 		 #140330 - Nevertheless, there IS a difference
Responding to: ???'s previous message
Andy said:
We do boards with a single ground plane with no splits all the time ...

and they're quiet. Very quiet.

There must be a reason, why even for the latest chips the recommended layouts of datasheet show splitted ground planes...

Andy said:
Again, the thing to do is pay attention to your return currents and ensure that you don't route digital signals over the quiet analog area.

Yes, that's a good idea. But ground return currents do not flow from point A to point B along a straight line, but also involve ground area in the neighbourhood.

And even if the result of conversion might not show increased noise, CE measurements often detect the generation of relevant common mode noise.

Kai

List of 37 messages in thread
TopicAuthorDate
need for isolating signals            01/01/70 00:00      
   avoiding the inverter            01/01/70 00:00      
      sinking the current            01/01/70 00:00      
         Sinking and sourcing            01/01/70 00:00      
            the bulb blinked !!!            01/01/70 00:00      
               Don't guess!            01/01/70 00:00      
                  trnasfer char.            01/01/70 00:00      
                     Transfer characteristic            01/01/70 00:00      
   More so            01/01/70 00:00      
   I see two possibilities            01/01/70 00:00      
      accuracy            01/01/70 00:00      
         0.01% approx 14 bits            01/01/70 00:00      
         Hardly...            01/01/70 00:00      
   No need...            01/01/70 00:00      
      need to place inverter            01/01/70 00:00      
      my design            01/01/70 00:00      
         FRC?            01/01/70 00:00      
            FRC?            01/01/70 00:00      
               or may be this......            01/01/70 00:00      
                  Not really            01/01/70 00:00      
                  Flat Ribbon Cable connector            01/01/70 00:00      
               FRC Connector!            01/01/70 00:00      
            You don't know the Flat Ribbon Cable?            01/01/70 00:00      
               Not by that name!            01/01/70 00:00      
         FAQ: How to post pictures?            01/01/70 00:00      
         you are grasping for straws            01/01/70 00:00      
         sure, but to what use            01/01/70 00:00      
         grounds etc            01/01/70 00:00      
            not entirely correct            01/01/70 00:00      
               single plane            01/01/70 00:00      
                  A very well qualified layout person can do 'magic'            01/01/70 00:00      
                     but he can hardly outsmart the laws of physics            01/01/70 00:00      
                  Nevertheless, there IS a difference            01/01/70 00:00      
                     the difference            01/01/70 00:00      
                        Yes, yes, yes, but...            01/01/70 00:00      
   Aside: Other Isolation Technologies            01/01/70 00:00      
   no response            01/01/70 00:00      

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