A good PCB layout practice is to keep the analog and digital grounds separate, use a solid ground plane, and keep the high-frequency signals away from the analog signals. Additionally, use a common-mode choke or ferrite bead to filter the power supply lines.
Make sure to follow the power-up sequence specified in the datasheet, and ensure that the VCC and VDD pins are properly decoupled with capacitors. Also, configure the device according to the application note and datasheet recommendations.
The maximum cable length supported by the MAX1487EESA+T depends on the specific application and the type of cable used. However, as a general guideline, the device can support cable lengths up to 100 meters for RS-485 and 1000 meters for RS-422.
Use a logic analyzer or oscilloscope to monitor the transmit and receive signals, and check for proper termination and biasing of the transmission lines. Also, verify that the device is properly configured and powered up.
Yes, the MAX1487EESA+T can be used in a multi-point or multi-drop configuration, but it requires proper termination and biasing of the transmission lines, as well as careful consideration of the system's electrical characteristics.
MAX1487EESA+T datasheet
by Maxim Integrated Products
