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Re: HSEROUT/HSERIN with RS422/485 Driver
Well, here's a quote from the previously mentioned appnote... http://www.maxim-ic.com/appnotes.cfm/an_pk/1090
This image is an example of unclamped overshoots ...Schottky-Diode Termination
Schottky diodes offer an alternative termination when power dissipation is a concern. Unlike other
termination types, Schottky diodes do not attempt to match the line impedance. Instead, they simply
clamp the over- and undershoots caused by reflections.
Ignore the yellow line.
DT
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Re: HSEROUT/HSERIN with RS422/485 Driver
Ok - got it now. Just a different method of achieving a similar result.
One has to wonder then why the terminating resistor is by far more popular? The diode arrangement seems more versatile and consumes less current......
Andy
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