ADN2848_15 Datasheet, PDF (1/12 Pages) Analog Devices – 3.3 V Dual-Loop 50 Mbps to 1.25 Gbps Laser Diode Driver

Data Sheet
3.3 V Dual-Loop 50 Mbps to 1.25 Gbps
Laser Diode Driver
ADN2848
FEATURES
50 Mbps to 1.25 Gbps operation
Single 3.3 V operation
Bias current range: 2 to 100 mA
Modulation current range: 5 to 80 mA
Monitor photo diode current: 50 μA to 1200 μA
50 mA supply current at 3.3 V
Closed-loop control of power and extinction ratio
Full current parameter monitoring
Laser fail and laser degrade alarms
Automatic laser shutdown (ALS)
Optional clocked data
Supports FEC rates
32-lead, 5 mm × 5 mm LFCSP_VQ package
GENERAL DESCRIPTION
The ADN2848 uses a unique control algorithm to control both
the average power and the extinction ratio of the laser diode
(LD) after initial factory setup. External component count and
PCB area are low because both power and extinction ratio
control are fully integrated. Programmable alarms are provided
for laser fail (end of life) and laser degrade (impending fail).
APPLICATIONS
SONET OC-1/3/12/24
SDH STM-0/1/4
Fibre Channel
Gigabit Ethernet
MPD
V_CC
IMPD
PSET
GND _ERSET
GND
FUNCTIONAL BLOCK DIAGRAM
V_CC
IMODN
IMODP
V_CC
LD
I_MOD
CONTROL
I_BIAS
ERCAP
DATAP
DATAN
CLKP
CLKN
I_BIAS
ADN2848
ASET
PAVCAP
LBWSET
GND
V_CC
R_Z
GND
GND
Figure 1.
Rev. B
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