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LMX2594: 低温-20至-40度时不能锁定,常温工作正常

Part Number: LMX2594
Other Parts Discussed in Thread: LMK01010

LMX2594构成的时钟电路,外围电路和环路参考开发板。参考信号由LMK01010时钟分配芯片提供的LVDS差分时钟,频率为40MHz。A、B两路输出设定为312.5MHz。

常温输出信号正常,锁定指示为高电平。在低温-20~-40度时,输出信号频率不稳定,每次上电或重新配置寄存器输出信号频率都可能变化,回读寄存器与配置的参数一样。

请问哪些寄存器配置和硬件设计与温度有关?该如何调整?