To minimize EMI and noise, it is recommended to use a multi-layer PCB with a solid ground plane, keep the signal traces short and away from the edges of the board, and use a shielded cable for the RS-232 interface. Additionally, decoupling capacitors should be placed close to the device's power pins.
To ensure reliable communication in noisy environments, it is recommended to use a shielded cable, implement error-checking protocols such as checksums or CRCs, and consider using a noise-filtering capacitor on the RS-232 lines. Additionally, the MAX336CAI+ has built-in noise filtering and hysteresis to help reject noise and spikes.
The maximum cable length supported by the MAX336CAI+ depends on the baud rate and the quality of the cable. As a general rule, the maximum cable length is approximately 50 feet (15 meters) at 9600bps, but this can be extended to 100 feet (30 meters) or more with the use of repeaters or high-quality cables.
To ensure proper operation, it is recommended to power up the MAX336CAI+ after the power supply has stabilized, and to power down the device before the power supply is turned off. Additionally, the device's power-on reset (POR) circuitry helps to ensure a clean power-up sequence.
The MAX336CAI+ is rated for operation up to 85°C, and thermal considerations should be taken into account to ensure reliable operation. This includes providing adequate heat sinking, using a thermally conductive PCB material, and avoiding high-power components nearby.
MAX336CAI+ datasheet
by Maxim Integrated Products
