How to Design with Capacitive Digital Isolators 5

Figure 5 utilizes d = 3h to minimize crosstalk

Use 45-degree trace routing (or chamfered bends) instead of 90-degree bends to maintain effective trace impedance and avoid signal reflections.

To enable operation in a noisy environment, connect the idle start input of the isolator to an appropriate reference layer via a resistor (1kΩ to 10kΩ). Connect the active-high, enable-high input to the power layer, while connecting the active-low input to the ground layer.    diode

When the through-hole inductance increases the signal path inductance, avoid layer changes with fast signal traces.

Using shorter trace lengths between the isolator and surrounding circuits can prevent noise introduction. Digital isolators typically incorporate isolated DC/DC converters, which provide power across the isolation barrier. Since the single-ended transmission signals of isolators are highly sensitive to noise introduction, the switching noise of nearby DC/DC converters can easily be introduced via long signal traces.

Place large-capacity capacitors (such as 10μF) near the power source, such as a voltage regulator, or at the point where the power enters the PCB.

By directly connecting the power terminal of the capacitor to the power terminal of the device and then routing it through vias to the Vcc layer, install small-value 0.1μF or 0.01μF bypass capacitors on the device. Connect the ground terminal of the capacitor to the ground layer via several vias  diode