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

24-Pin MLF™ (ML) ........................................................................................................................................................................... 68