AD5255BRU25-RL7 Ver la hoja de datos (PDF) - Analog Devices

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AD5255BRU25-RL7

3-Channel Digital Potentiometer with Nonvolatile Memory

Analog Devices 

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.

AD5255

Any changes 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.

AD5255

SDA

SCL

VCC VCC

ADN2841

PSET

ERSET

ASET

Figure 33. Optical Supervisory System

Rev. A | Page 19 of 20

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