LG1626DXC Datasheet, PDF (1/10 Pages) Agere Systems – LG1626DXC Modulator Driver

Data Sheet
February 1999
LG1626DXC Modulator Driver
Features
Functional Description
s High data-rate optical modulator driver
s Adjustable output voltage up to 3 Vp-p (RL = 50 Ω)
s Adjustable modulator dc offset
s Operation up to 3 Gbits/s
s Single ended or differential inputs
s Single –5.2 V power supply
s 90 ps rise and fall times
s Enable control
Applications
s SONET/SDM transmission systems
s SONET/SDM test equipment
s Optical transmitters
The LG1626DXC is a gallium-arsenide (GaAs) inter-
grated circuit used to provide voltages to drive optical
modulators in high-speed non-return-to-zero (NRZ)
transmission 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 device contains four cascaded stages,
operates with a single –5.2 V power supply, and
accepts ECL 100K level inputs. The output is an
open drain designed to drive 50 Ω loads. Voltages
control the output modulation amplitude and modula-
tor dc offset. A –2.5 V band-gap reference is required
for stable operation over temperature and varying
power supply voltage. The LG1626DXC is available
in a 24-lead hermetic, gull-wing package.
GND
BG2P5
MK
VTH
MK
VDC-ADJ
VIN
VIN
VTH
MOD_E
VMOD
VSS3
VSS2
VSS1
VOUT
VOUT-DC
Figure 1. Functional Diagram
5-6549(F)