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| MIC3000 Datasheet, PDF (61/68 Pages) Micrel Semiconductor – SFP Management IC | |||
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MIC3000
Applications Information
Controlling Laser Diode Bias
MIC3000
RFB
APCDAC
To ADC
VMPD
FB
VDD
VDDA
RBASE
VBIAS
Q1
PNP L1
CCOMP
COMP
VDD
From laser
driver
IMOD
LDA
MDC
To ADC
VILD+
VILDâ
SHDN
LDC/MDC
L2
Redundant
Switch
(optional)
RSENSE
Figure 25. Example APC Circuit for Common-Cathode TOSA
VDD
MIC3000
To ADC
SHDN
VILDâ
VILD+
RSENSE
Redundant
Switch
(optional)
L2
LDC/MDC
APCDAC
RFB
VDDA
VDD
RBASE
VBIAS
CCOMP
COMP
L1
Q1
PNP
LDA
IMOD
To laser
driver
MDC
To ADC
FB
VMPD
Figure 26. Example APC Circuit for Common Anode TOSA
Micrel
October 2004
61
M9999-101204
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