Data Sheet
June 1999
LG1625AXF Laser Driver
Features
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Description
The LG1625AXF is a gallium-arsenide (GaAs) laser
diode driver to be used with direct modulated laser
diodes in high-speed nonreturn-to-zero (NRZ) trans-
mission systems. The device is made in a high-per-
formance 0.9
µm
gate GaAs heterojunction FET
technology that utilizes high-density MIM capacitors,
airbridge interconnect, and NiCr film precision resis-
tors.
The device contains three cascaded stages, oper-
ates with a single –5.2 V power supply and accepts
ECL level inputs. Voltages control the modulated out-
put current and laser prebias current. The
LG1625AXF is available in a 24-lead hermetic, gull-
wing package.
A test fixture (TF1006A) with SMA connectors is
available to allow quick evaluation of the LG1625AXF.
High data-rate laser diode/LED driver
Adjustable output current
Operation up to 3 Gbits/s
Single –5.2 V power supply
90 ps rise and fall times
Applications
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SONET/SDH transmission systems
SONET/SDH test equipment
Optical transmitters
GND
MK
MK
V
PRE
V
IN
V
TH
LG1625AXF
I
OUT
V
MOD
V
SS3
V
SS2
V
SS1
5-7865(F)
Figure 1. Functional Diagram
AGERE [ AGERE SYSTEMS ]
