The figures shown in this slide illustrate the transition from the STANDBY mode to the TX or RX mode using the built-in sequencer. The user only needs to program the desired mode, and the internal sequencer will properly transition the part from its current mode. The VCO will automatically calibrate at every frequency change or power up. The PLL TO is to allow for bias settling of the VCO, and the PLL TS time is for the settling time of the PLL, which has a default setting of 100μS. The total time for PLL TO, PLL CAL, and PLL TS under all conditions is 200μS. In certain applications, the PLL TO time and the PLL CAL may be skipped for faster turn-around time.