I am trying to use the Dual Differential Line Driver to take a single ended pulse train and direction signal and create a differential signal to control a servo motor. The third party servo adapter has the following input signals. Pulse, *Pulse, Direction, and *Direction and then returns encoder feedback signals.
I have an issue when I connect this third party load it drops the pulse train from a 0-5 V signal to 0-3.3~3.7V.
I am using a recommend circuit from the supplier. Circuit shows to input my pulse train signal in pin 5 and short pin 5 to 6. Pin 3 will go into their Pulse input with a short between pin 4 and 3. I assume this short is to provide a active drive for high and low. The same circuit is used for *Pulse input, except pins 1 and 2 are shorted.
I have pins 7,9, and 10 pulled to 5V to enable the outputs.
The circuit appears to draw around 80 mA when connected which seems high. I am using a bench top supply to supply the 5V and common, so the voltage drop is not due to the power supply being limited, it probably has to be over driving the driver output.
Here is the recommended circuit, I know this circuit shows encoder signals, but I would expect the Pulse inputs to be similar.
