Hi,
A customer is using SN65MLVD204 for clock distribution bus(Multidrop clock distribution mode) in their system,the clock frequency is 40MHz,in their design,one transceiver board with one SN65MLVD204 and 16 pcs receiver board with 16 pcs SN65MLVD204,these 16 pcs sub-boards are inserted one backplane.According to our recommendation,two 100 ohm termination resistances should be used at two far endpoints,but after customer's test,two 100 ohm termination resistances will cause receiver's clock distortion,but when they only use one 50 ohm termination resistance at the farthest endpoint,the receiver clocks are better and work well.This is one question.
Now when they were doing the temperature test at high temperature condition,they found the receiver's clock was anamorphic again,the distortion happened at the several receiver boards closer to the transceiver and farther receiver boards were normal,but they didn't change any circuit and any resistance,and they still used one 50 ohm termination resistance.After they take these boards to normal temperature status(room temperature),these issues still exist.This is second question.
When they try to change this one 50 ohm termination resistance to one 33 ohm,all board work well and all receiver clocks are right.This is third question.
Would anybody like to help on this case?Thanks a lot.
Best regards
Dale
