I face some EMI and noise problems when using an AMC1210 CLK4 output at 18.75MHz. The clock line is about 15cm long before it changes the board through a 15cm long cable to the second board where the delta-sigma-modulators are located.The clock line is not strictly a line - more looking like a treee. The clock line is running to several delta-sigma-modulators that have to work synchronously.
Is it recommended to have a termination resistor at the end of the long clock line to avoid noise on other signal lines caused by the clock signal. But where is "the end" of the line within a tree structure? I read a TI article called 'EMI Prevention in Clock-Distribution Circuits' and they recommend clock line termination using resistors. But what load can I add to the AMC1210 clock line? There is no data like maximum clock current in the data sheet.
I hope someone can help with that problem.
