SNAS642A June 2014 – July 2014 LMK00804B
Solid ground planes are recommended as they provide a low-impedance return paths between the device and its bypass capacitors and its clock source and destination devices.
Avoid return paths of other system circuitry (for example, high-speed/digital logic, switching power supplies, and so forth) from passing through the local ground of the device to minimize noise coupling, which could induce added jitter and spurious noise.
Follow the power supply schematic and layout example described in Power-Supply Filtering.
Please refer to the LMK00804BEVM for a layout example. A sample PCB layer is shown below.