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max frequency of pin headers

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Maxwell077

Maxwell077

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Hi,

Anybody knows about what max frequency can be transmitted over a usual pin header?

I'll connect an ADC daughter board to FPGA eval kit, and ADC clock comes from FPGA.
I just want to know the max freq to fed ADC while connecting over pin headers..

Thanks...
 

Depends on a lot: cables and length, ground pin layout, source and load impedances. 50 or 100 MHz should mostly work, possibly more.
 

If you can make that ribbon cable look like a transmission
line you'll do a lot better than if it looks like just capacitance.
I've seen twisted-pair ribbons and you could probably go
ground-signal-ground-signal-ground... and get something
like a transmittion line (Z=TBD). With just one clock to care
about, you could probably afford to match the line & use a
decent driver.
 
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    FvM

    FvM

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I saw one used once up to 3 ghz, and it worked suprisingly well. It had a pin with the signal, and 8 pins around it, in a square, connecting the two board grounds together.
 

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