I would like to know about the Differential input threshold voltage of RS-485 receiver.
It should be -0.2V/+0.2V
Does it depend on the signal frequency?
I checked ADM3485 by 5MHz square wave, then it needs over 0.8V amplitude.
(When it inputs the sine wave, then it needs over 1V amplitude)
The duty is 50%.
At 200KHz, the threshold is about +/- 0.2V.
Does this feature meet the RS485 specifications?
The input level will change the delay time?
How to measure this threshold?
Could I have the advice?