The VM-802 incorporates a standard High Speed Current Logic, HCSL ,output scheme which is a 15mA current source switched between Out and Comple-
mentary Out. Being un-terminated drains, as shown in Figure 8, they require external 50 ohm resistors to ground as shown in Figure 9. HCSL is a high im-
pedance output with quick switching times, in can be advantageous to use a 10 to 30 ohm series resistor as shown in Figure 10, to help reduce overshoot/
ringing.
One of the most important considerations is terminating the Output and Complementary Outputs equally. An unused output should not be left un-termi-
nated, and if it one of the two outputs is left open it will result in excessive jitter on both. PC board layout must take this and 50 ohm impedance matching
into account. Load matching and power supply noise are the main contributors to jitter related problems.
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Tools/Materials
Yitong Chuanglian MODBUS to PROFIBUS Gateway YT-PB-03
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