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Posts Made By:
ericthegeek
Forum:
RDM Physical Layer/Hardware Discussion
August 5th, 2008
Replies:
7
Line biasing Flaws - need solutions
Views:
17,167
Posted By
ericthegeek
In your initial post, you described the problem...
In your initial post, you described the problem at 5v. Are you seeing the problem with with 5v line drivers, or only under common mode conditions?
One option might be to build a separate...
Forum:
RDM Physical Layer/Hardware Discussion
August 4th, 2008
Replies:
7
Line biasing Flaws - need solutions
Views:
17,167
Posted By
ericthegeek
The R1 bias resistor is recommended to be 562...
The R1 bias resistor is recommended to be 562 ohm. If the 485 line is driven to 5v, you're looking at (5v-3.3v)/562ohm = 3mA. As for pulling your power supply out of spec, 3mA is no worse than a...
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