Intel ? TXN31011 Tri-rate LC SFF Optical Transceiver
3.0
3.1
Figure 2.
Termination
The TXN31011 Optical Transceiver has the following two types of I/O interfaces:
? CML Interface
? TTL Interface
The high speed I/Os use the CML interface, while the control signals use the TTL interface. Proper
termination is critical to ensure good signal integrity. Without the proper termination (particularly
on the CML I/Os), jitter increases significantly due to reflection from the impedance mismatches.
CML Termination
AC-coupling capacitors are built into the TXN31011 Optical Transceiver.
Circuit Diagram for CML Termination on Receiver Output
3.3V
50 ?
Module Rx output
AC-coupling
capacitor
100 ?
Serdes input
Most of the SerDes comes with the internal termination resistor. Please check the SerDes
specification sheet for proper external termination.
Datasheet
Intel ? TXN31011 Tri-rate LC SFF Optical Transceiver
Order Number: 280050, Revision: 003
07 Feb 2005
9
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