GD16521 Datasheet, PDF (1/13 Pages) List of Unclassifed Manufacturers – 2.5 GBIT/S RE TIMING LASER DRIVER

an Intel company
2.5 Gbit/s
Re-timing
Laser Driver
GD16521
Preliminary
General Description
Features
The GD16521 is a high performance low
power 2.5 Gbit/s Laser Driver with
optional on chip re-timing of data.
The GD16521 is designed to meet and
exceed ITU-T STM-16 and SONET
OC-48 fiberoptic communication systems
requirements.
The GD16521 is designed to sink a Mod-
ulation Current into the IM pin and a
Pre-Bias Current into the IB pin. The
Modulation Current is adjustable up to
50 mA and the Pre-Bias Current is ad-
justable up to 100 mA. The device fea-
tures two control loops for stabilizing the
laser diode operating conditions. An au-
tomatic optical power control loop main-
tains a constant average optical power
out of the laser diode, independent of
changes in the threshold current of the
laser diode. A modulation current control
loop maintains a constant modulation
current for the laser diode, or alterna-
tively maintains a constant extinction ra-
tio of the laser diode.
Re-timing of the data signal connected to
the pins SDIP/SDIN is made by means of
a DFF-clocked by an external clock sig-
nal at the data rate fed to the pins SCIP/
SCIN.
The GD16521 requires a single +3.3 V
supply.
The circuit is available as:
u _{48 lead 7 × 7 mm TQFP power}
enhanced plastic package
u _die.
FFSET
DUTY
IMB IM
AR PD
IB
IBM
l _{Differential CML data and clock}
inputs with internal 50 W load termi-
nation.
l _{Selectable on chip retiming-FF.}
l _{Output modulation current pulse duty}
width adjustable
(Compensates for LD emission delay)
l _{Modulation/Bias current monitor}
output.
l _{Modulation/Bias current shutdown}
input.
l _{Single supply operation: +3.3 V.}
l _{Power dissipation: 410 mW (typ.).}
l _{Available as:}
– 48 lead 7 × 7 mm TQFP power
enhanced plastic package
– die
TDlP
TDlN
SDlP
SDlN
SClP
SClN
TClP
TClN
IMC
IMM
DFF
SEL
Duty
Adjust
+-
Mark/Space
Monitor
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VCC
VCCCONT
VCCCM
VCCR
VEE
VEER
MTJ
Applications
l _{Tele Communication:}
– SDH STM-16 modules
– SONET OC-48 modules
OPSET
l _{Data Communication.}
+-
l _{Electro Absorption laser driver.}
l _{Direct Modulation laser driver.}
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MARKN MARKP
SHDW IMSET
IBSET
Data Sheet Rev.: 11