Termination (resistors) is the answer in the cable. As long as they are in
the right location. Somewhere around 47 ohms in series with the output of
the translator, and around 100 ohms on the input (receiving end of the
cable). Just guessing on the values but start there first.
Rick

Pat Smith wrote:

> I made a circuit board to control a sensor. I converted an 18 inch, 15
> pin, VGA cable To go from the Board to the sensor. The output of the
> controller is at 3 volt Levels the sensor needs 5 volt levels. So I used
> a 3.3 to 5 volt translator for the clocks. The problem is, at the sensor
> the waveforms look terrible, ringing overshooting, and cross talking to
> ground. They look OK without the
> Cable, but still overshoot. Sensor Analog output looks Ok Then bad. I
> tried putting resistors in series and parallel with the clocks.Helps a
> little but output still schitzes out.
> IS there anything I can do about this?
> Im not an EE , just doin this for what I thought was fun.
>
> Thx
>
> --

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu