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PDF LG1626DXC Data sheet ( Hoja de datos )
| Número de pieza | LG1626DXC | |
| Descripción | LG1626DXC Modulator Driver | |
| Fabricantes | Agere Systems | |
| Logotipo |  |
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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)
1 page  
Data Sheet
February 1999
LG1626DXC Modulator Driver
Electrical Characteristics
TA = 25 °C, VSS1 = VSS2 = VSS3 = –5.2 V, VTH = – 1.3 V, VMOD = – 3.8 V, RL = 50 Ω.
Minimum and maximum values are testing requirements. Typical values are characteristics of the device and are
the result of engineering evaluations. Typical values are for information purposes only and are not part of the test-
ing requirements. Stresses in excess of the absolute maximum ratings can cause permanent damage to the
device.
Table 4. LG1626DXC Minimum and Maximum Values
Parameter
Symbol
Data Input Voltage (peak to peak) Single Ended
VIN
Voltage Control for Output Modulation Current
VMOD
Maximum Modulated Output Voltage1
VOUT
Minimum Modulated Output Voltage2
VOUT
Output Rise and Fall Times (20%—80%)
tR, tF
Power Supply Voltage
VSS1, VSS2, VSS3
Power Supply Current3
ISS1
Mark Density4
MK
Complementary Mark Density4
Voltage Control for Modulator dc Offset
Maximum Output, Modulator dc Offset5
MK
VDC-ADJ
VOUT-DC
Minimum Output, Modulator dc Offset6
VOUT-DC
Min
300
–5.5
2.70
0
—
–5.5
100
—
—
–5.5
1.2
0
1. Maximum output modulation at maximum VMOD (RL = 50 Ω).
2. Minimum output modulation when MOD_E is floating and VMOD = VSS3.
3. Excludes IPRE and average IMOD:
Power suppy current ISS2 (relating to prebias) is dependent on VPRE.
Power suppy current ISS3 (relating to modulation) is dependent on VMOD.
4. Both MK and MK are open drains, the typical value is obtained by driving a 1kΩ load.
5. Maximum modulator dc offset voltage (RL = 50 Ω) at maximum VDC-ADJ.
6. Minimum modulator dc offset voltage (RL = 50 Ω) at VDC-ADJ = VSS2.
Note: All parameters measured at 25 °C ambient.
Typ
600
—
—
—
90
–5.2
140
–0.5
–0.5
—
—
—
Max
1000
–4
3.00
0.2
—
–4.9
180
—
—
–3
1.5
0.1
Unit
mV
V
V
V
ps
V
mA
V
V
V
V
V
Lucent Technologies Inc.
5
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