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, the MAX3226EEAE+T should be placed close to the connector to minimize the length of the transmission lines.
To ensure proper termination, a 1 kΩ to 10 kΩ pull-up resistor should be connected between the transmitter output and VCC, and a 1 kΩ to 10 kΩ pull-down resistor should be connected between the receiver input and GND. Additionally, the transmission lines should be terminated with a 120 Ω resistor at the receiving end.
The maximum cable length supported by the MAX3226EEAE+T is approximately 100 meters at a data transmission rate of 250 kbps. However, the cable length can be extended up to 400 meters at a lower data transmission rate of 100 kbps. The cable length and data transmission rate are inversely proportional, meaning that as the cable length increases, the data transmission rate decreases.
The MAX3226EEAE+T has built-in common-mode noise rejection and electromagnetic interference (EMI) filtering capabilities. The device uses a differential signaling scheme to reject common-mode noise, and its internal filtering capabilities help to reduce EMI. Additionally, the device's transmitter and receiver circuits are designed to provide high immunity to electromagnetic interference.
The recommended power-up sequence for the MAX3226EEAE+T is to power up VCC before enabling the transmitter and receiver circuits. The power-down sequence is the reverse of the power-up sequence. Improper power sequencing can cause the device to malfunction or enter an unknown state.
MAX3226EEAE+T datasheet
by Maxim Integrated Products
