AD5255(Rev0) 查看數據表（PDF） - Analog Devices
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AD5255 Datasheet PDF : 20 Pages
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APPLICATIONS
LASER DIODE DRIVER (LDD) CALIBRATION
The AD5255 can be used with any laser diode driver. Its high
resolution, compact footprint, and superior temperature drift
characteristics make it ideal for optical parameter setting.
The ADN2841 is a 2.7 Gbps laser diode driver that uses a
unique control algorithm to manage both the laser average
power and extinction ratio after initial factory calibration. It
stabilizes the laser data transmission by continuously
monitoring its optical power and by correcting the variations
caused by temperature and the laser degradation over time. In
the ADN2841, the IMPD monitors the laser diode current.
Through its dual-loop power and extinction ratio control,
calibrated by the AD5255, the internal driver controls the bias
current IBIAS and consequently the average power. It also
regulates the modulation current, IMODP, by changing the
modulation current linearly with slope efficiency. Any changes
AD5255
in the laser threshold current or slope efficiency are, therefore,
compensated. As a result, this optical supervisory system
minimizes the laser characterization efforts, enabling designers
to apply comparable lasers from multiple sources.
VCC VCC
AD5255
SDA
SCL
ADN2841
PSET
ERSET
ASET
Figure 33. Optical Supervisory System
Rev. 0 | Page 19 of 20
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