MIC3000

Micrel

M9999-101204

4

October 2004

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