Field Question: A customer has to connect 16 signals at 100MHz between a mother board and a daughter board with a distance of 10cm. They though to use our SN65LVDS387 to perform the connection but they have no experience in high speed connection so they want to know which kind of cable they have to use to don't have any signal integrity problem. I see in the datasheet some cable are suggested but for a longer distance 1-10meter. For this short distance they are forced to use this kind of cable or just a normal cable can be used? We can also suggest a pin out for the high speed data connector? Response: At this short of a distance, any cable with 100-Ω differential impedance (as per the LVDS standard) should be sufficient. The connector used will obviously depend on the cabling and any mechanical constraints, but any connector that is specified for frequencies of at least 100 MHz will work. I recommend that the differential pairs be routed together to adjacent pins on the high speed data connector. This would allow the customer to reduce EMI by transmitting the data via twisted pairs. Regards, Max
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