LG1627BXC Datasheet, PDF (1/10 Pages) Agere Systems – LG1627BXC Clocked Laser Driver

Data Sheet
May 2001
LG1627BXC Clocked Laser Driver
Features
s High data-rate clocked laser diode driver
s Clock disable mode for data feedthrough
s Adjustable high output current
s Operation up to 3 Gbits/s
Applications
s SONET/SDH transmission systems
s SONET/SDH test equipment
s Optical transmitters
Functional Description
The LG1627BXC is a gallium arsenide (GaAs) laser
diode driver to be used with direct modulated laser
diodes in high-speed non-return-to-zero (NRZ) trans-
mission systems. The device is made in a high-
performance 0.9 µm gate GaAs hetero-junction FET
technology that utilizes high-density MIM capacitors,
airbridge interconnect, and NiCr film precision resis-
tors. The driver includes differential data and clock
inputs. The high-output, low overshoot drive current
and prebias can be set separately. Data retiming is
accomplished by the internal flip-flop, minimizing
jitter on the data. Clocking can be disabled for data
feedthrough. A pulse-width control enables the user
to compensate for laser turn-on delay. A 2.5 V band-
gap reference is required for stable operation over
temperature and varying power supply voltage.
Functional Diagram
VTH
VIN
VIN
CLK
CLK
CLK_E
MOD_E
GND
BG2P5
MK
MK
VPRE
IOUT-PRE
LG1627BXC
VMOD
VSS3
VSS2
VSS1
PWN
PWP
IOUT
Figure 1. Functional Diagram
5-6549(F).b