TI中文支持网请问Vrefvco的电压范围是多少？目前PLL无法锁定，只有VREFVCO的电压和评估板不同，测试值是2.3V，评估板测试值是2.5V。
Kailyn Chen：
应该是2.5V左右，幅度相差+-0.1V应该不会导致PLL无法锁定。
按照推荐的上电时序操作的吗？
1. Apply power to the device and ensure the Vcc pins are at the proper levels.2. If CE is LOW, pull it HIGH.3. Wait 100 μs for the internal LDOs to become stable.4. Ensure that a valid reference is applied to the OSCin pin.5. Program register R0 with RESET=1. This will ensure all the registers are reset to their default values.6. Program in sequence registers R60, R58, R53, …, R1 and then R0.
