Make sure that the connection to the VDD pin is low impedance. Good analog
design practice is to place a greater than 0.1µF ceramic capacitor as near as
possible to the VDD pin.
To further improve the noise immunity on the SENSE pins, placing a 10nF to 100nF capacitor between the SENSE pin and GND can reduce the sensitivity to transient voltages on the monitored signal.
If a capacitor is used on CTS or CTR, place these components as close as
possible to the respective pins. If the capacitor adjustable pins are left
unconnected, make sure to minimize the amount of parasitic capacitance on the
pins to less than 5pF.
Place the pull-up resistors on RESET as close to the pin as possible.
When laying out metal traces, separate high
voltage traces from low voltage traces as much as possible. If high and low
voltage traces need to run close by, spacing between traces must be greater than
20mils (0.5mm).
Do not have high voltage metal pads or traces
closer than 20 mils (0.5mm) to the low voltage metal pads or traces.