2.2 LVDS Application

Note: Some LVDS structures have an internal 100Ω resistor on the input and do not need additional components. AC blocking capacitors can be used if the DC levels are incompatible.

Figure 2-3. LVDS to LVDS Connection, Internal 100Ω Resistor

One of the most important considerations is terminating the Output and Complementary Outputs equally. An unused output should not be left unterminated, 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 50Ω impedance matching into account. Load matching and power supply noise are the main contributors to jitter related problems.

Note: Some input structures may not have an internal 100Ω resistor on the input and will need an external 100Ω resistor for impedance matching. Also, the input may have an internal DC bias which may not be compatible with LVDS levels, AC blocking capacitors can be used.

Figure 2-4. LVDS to LVDS Connection