Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the input and output traces as short as possible. It's also recommended to use a common mode choke or a ferrite bead to filter the input power.
The DS9638CM requires a bias voltage of 2.5V to 5.5V. Ensure the bias voltage is stable and noise-free, and that the input voltage is within the recommended range. Also, make sure to decouple the bias pin with a 10nF capacitor to ground.
The DS9638CM can support data rates up to 100 Mbps, but the actual data rate depends on the specific application, cable length, and signal quality.
Use a shielded cable, and ensure the DS9638CM is placed in a shielded enclosure. Also, use a common mode choke or a ferrite bead to filter the input power, and consider adding EMI filters or shielding to the PCB.
The typical power consumption of the DS9638CM is around 10mA to 20mA, depending on the operating frequency and data rate. However, this can vary depending on the specific application and usage.