SNAU182A March 2021 – May 2022
The Reference PRO board is used to program the LMX2571EPEVM and at the same time, provide a clean reference clock to LMX2571EPEVM. The board has several control pins dedicated for control of output format, output frequency, and output enable control. These control pins are configurable through the jumpers by strapping the center pin to Vdd position or GND position. Connections from the Vdd position to the device supply or from the GND position to the ground plane are connected by 1.5-kΩ resistors. By default, the board is configured for 100-MHz LVPECL output. The power supply to Reference PRO is obtained from the PC that is connecting to Reference PRO through the USB interface.