MIC3000 Datasheet, PDF (4/68 Pages) Micrel Semiconductor – SFP Management IC

MIC3000
Micrel
Table 21. Control Range of SY88912 Modulation Control Circuit ................................................................................................... 63
SY88932 3.3V 3.2Gbps SONET/SDH Laser Driver .......................................................................................................................... 63
Figure 30. Controlling the SY88932 Modulation Current ................................................................................................................. 63
SY89307 5.0V/ 3.3V 2.5Gbps VCSEL Driver .................................................................................................................................... 64
Figure 31. Controlling the SY89307 Modulation Current ................................................................................................................. 64
Laser Drivers Programmed via a Sink Current .............................................................................................................................. 64
Figure 32. Controlling the Modulation Current via a Sink Current ................................................................................................... 64
Drivers With Monitor Outputs .......................................................................................................................................................... 64
Shutdown Output .............................................................................................................................................................................. 64
Figure 33. Redundant Switch Circuits ............................................................................................................................................. 65
Temperature Sensing ....................................................................................................................................................................... 65
Table 23. Contributors to Self-Heating ............................................................................................................................................ 65
Remote Sensing ................................................................................................................................................................................ 65
Table 22. Transistors Suitable for Use as Remote Diodes ............................................................................................................. 65
Minimizing Errors .............................................................................................................................................................................. 65
Self-Heating ....................................................................................................................................................................................... 65
Series Resistance with External Temperature Sensor .................................................................................................................. 66
XPN Filter Capacitor Selection ........................................................................................................................................................ 66
XPN Layout Considerations ............................................................................................................................................................. 66
Figure 34. Guard Traces and Kelvin Return for Remote Thermal Diode ........................................................................................ 66
Layout Considerations ..................................................................................................................................................................... 66
Small Form-Factor Pluggable (SFP) Transceivers ........................................................................................................................ 66
Figure 35. Typical SFP Control and Status I/O Signal Routing (not to scale) ................................................................................. 66
Power Supplies ................................................................................................................................................................................. 67
Figure 36. Power Supply Routing and Bypassing ........................................................................................................................... 67
Using The MIC3000 In a 5V System ................................................................................................................................................. 67
Package Information ......................................................................................................................................................................... 68
24-Pin MLF™ (ML) ........................................................................................................................................................................... 68
M9999-101204
4
October 2004