To minimize EMI and ensure reliable operation, it is recommended to follow a star-grounding scheme, keep the transmitter and receiver lines as short as possible, and use a solid ground plane. Additionally, use a common-mode choke or ferrite bead to filter the transmitter output, and keep the receiver input lines away from the transmitter output lines.
To ensure that the MAX3225EUP+T operates within the specified temperature range, it is recommended to provide adequate heat sinking, use a thermally conductive material for the PCB, and avoid blocking airflow around the device. Additionally, consider using a thermal interface material to improve heat transfer between the device and the heat sink.
The recommended termination resistors for the MAX3225EUP+T are typically in the range of 100Ω to 1kΩ. To calculate the termination resistor value, consider the transmission line impedance, the driver output impedance, and the receiver input impedance. A good starting point is to use a termination resistor value that matches the transmission line impedance.
The enable input (EN) should be driven high to enable the device and low to disable it. When EN is low, the device enters a low-power shutdown mode. It is recommended to use a pull-up or pull-down resistor to ensure the EN pin is properly biased, and to avoid floating the EN pin.
If the built-in 15kΩ pull-up resistors on the receiver inputs are not used, an external pull-up resistor should be added to ensure the receiver inputs are properly biased. Failure to do so may result in incorrect receiver operation or increased power consumption.
MAX3225EUP+T datasheet
by Maxim Integrated Products
