This devices uses a 2.5-V supply for the whole device. A direct connection to a switching power supply likely results in unwanted spurs at the output. Bypassing can be done individually at all the power pins. TI recommends placing smaller capacitors with higher frequency of minimum impedance on the same layer as the device, as close to the pins as possible. The frequencies of nearly all signals in the device are 100 MHz or greater, therefore larger value bypass capacitors with low frequency of minimum impedance are only used for internal LDO stability, and the distance to the device (and the loop inductance of the bypass path) can be larger. Isolate the supply pins for the clocks and the LOGICLK with a small resistor or ferrite bead if both are being used simultaneously. See the Pin Configuration and Functions section for additional recommendations for each pin.