The required wait time between asserting Chip Enable (CE) and when the SPI inputs (CLK, DATA, LE) can be used on the ADF41513 depends on the value of the CReg1 decoupling capacitor. For a 1.1uF capacitor, the wait time is approximately 200us. For a 4.8uF capacitor (the datasheet recommendation), the wait time is approximately 450us. For a 20uF capacitor, the wait time is approximately 1.2ms.