Maxim provides a recommended PCB layout in the datasheet, but it's also important to follow general high-frequency PCB design guidelines, such as using a solid ground plane, minimizing trace lengths, and using 50Ω transmission lines. Additionally, it's recommended to place the device near the edge of the board to minimize signal reflections.
The DS2118MB/T&R requires a 50Ω termination resistor to match the impedance of the transmission line. It's recommended to use a high-quality, low-inductance resistor with a value of 49.9Ω or 50.1Ω. The termination resistor should be placed as close to the device as possible to minimize signal reflections.
The maximum cable length supported by the DS2118MB/T&R depends on the specific application and the type of cable used. However, as a general rule, the device can support cable lengths up to 100 meters at data rates up to 1.5 Gbps. For longer cable lengths or higher data rates, it's recommended to use repeaters or active cables.
To troubleshoot signal integrity issues with the DS2118MB/T&R, use an oscilloscope to measure the signal waveform and eye diagram. Check for signal reflections, ringing, and jitter. Verify that the device is properly terminated and that the PCB layout follows the recommended guidelines. Also, check the power supply voltage and ensure it's within the specified range.
While the DS2118MB/T&R is designed for 50Ω systems, it can be used in non-50Ω systems with some limitations. However, the device's performance may be degraded, and signal reflections may occur. It's recommended to use an external impedance-matching network to match the device's output impedance to the system's impedance.
DS2118MB/T&R datasheet
by Maxim Integrated Products
