LMK04906 DAC LOCK的判断条件是什么?
时间:10-02
整理:3721RD
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请问什么DAC lock是DAC输出在什么区间里会被判定为lock.
Datasheet 上只说了 “DAC Locked is asserted when EN_Track = 1 and DAC is closely tracking the PLL1 tuning voltage"
当EN_Track=1时DAC lock, DAC track PLL1的电压是通过读取DAC_CNT 的寄存器的值:
“The DAC_CNT register is 10 bits in size and located at readback bit position [23:14]. When using tracking mode
for holdover, the DAC value can be readback at this address. ”
DAC_CNT 是只读寄存器, 是在holdover状态下读取当前DAC值的, 我的问题是DAC Lock判定的阈值是什么, 在那里设定?
Hi Xiaojie,
DAC Locked是由芯片内部判定的,不能任意设定门限,判定的阀值也是不公开的。
Nick