3 V Dual-Loop 50 Mbps to 3.3 Gbps
Laser Diode Driver
a
ADN2847
FEATURES
APPLICATIONS
50 Mbps to 3.3 Gbps Operation
Single 3.3 V Operation
Typical Rise/Fall Time 80 ps
SONET OC-1/3/12/48
SDH STM-0/1/4/16
Fibre Channel
Bias Current Range 2 mA to 100 mA
Modulation Current Range 5 mA to 80 mA
Monitor Photodiode Current 50 ꢀA to 1200 ꢀA
Dual MPD Functionality for DWDM
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
Gigabit Ethernet
DWDM Dual MPD Wavelength Control
GENERAL DESCRIPTION
The ADN2847 uses a unique control algorithm to control both
average power and extinction ratio of the laser diode, LD, after
initial factory setup. External component count and PCB area are
low as both power and extinction ratio control are fully integrated.
Programmable alarms are provided for laser fail (end of life) and
laser degrade (impending fail).
Supports FEC Rates
Optional dual MPD current monitoring is designed into the
ADN2847 specifically for DWDM wavelength control.
48-Lead (7 mm ꢁ 7 mm) LFCSP Package
32-Lead (5 mm ꢁ 5 mm) LFCSP Package
Available in Die Form
FUNCTIONAL BLOCK DIAGRAM
V
CC
V
CC
IMODN
LD
V
CC
IMODP
MPD
IMPD
DATAP
DATAN
CLKP
CLKN
I
MOD
IMPD2
PSET
CONTROL
GND
I
BIAS
I
BIAS
ASET
GND
GND
ERSET
ADN2847
GND
ERCAP
PAVCAP
GND
IDTONE
LBWSET
GND
REV. 0
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