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ADC12D1800

Other Parts Discussed in Thread: ADC12D1800, LMX2531

最近在调试AD模块,使用ADC12D1800,AD输出的时钟DCLKI、DCLKQ首先经过FPGA内部的PLL用于寄存数据,但是PLL的LOCK信号不能锁定,出现低电平,请问最可能是什么原因?