大家好
我的名字是fang,我正在连接ADC板(AD7626)和ml605套件。
ADC具有16位LVDS,10Msps输出。
我使用ml605 Gclk引脚向AD7626输出20M时钟,它工作,上升沿为16 ns,但当时钟变为80M时,它不起作用.ADC的时钟拓扑结构为:
DCM + BUFG + ODDR + OBUFDS
80M波形如下所示,表明边缘太慢而无法产生这样的时钟?
以上来自于谷歌翻译
以下为原文
hello everbody
My name is fang and I am interfacing a ADC board(AD7626) to ml605 kit. The ADC has a 16bit LVDS,10Msps output.
I used ml605 Gclk pin to output 20M clock to AD7626,it works,the rising edge is 16 ns,but when the clock changed to 80M,it does not work.the clock topology for ADC is:
DCM+BUFG+ODDR+OBUFDS
80M waveform show as follows,it shows that the edge is too slow and it can not generate such clock?