A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the analog and digital sections separate, and use a common ground point for the analog and digital grounds.
Use a combination of ceramic and electrolytic capacitors for bypassing, with a total capacitance of at least 10uF. Place the capacitors as close to the device as possible, and use a low-ESR capacitor for the 3.3V supply.
The maximum clock frequency is 1600 MHz, but it's recommended to use a clock frequency of 1200 MHz or less for optimal performance and to minimize jitter.
Use the device's programming interface to set the desired frequency band. The device can be programmed using a serial interface, and the frequency band can be selected using the device's register settings.
The typical power consumption of the LMX2485ESQ/NOPB is around 350mW, but this can vary depending on the frequency band, output power, and other factors.
LMX2485ESQ/NOPB datasheet
by Texas Instruments
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