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PDF LG1625AXF Data sheet ( Hoja de datos )
| Número de pieza | LG1625AXF | |
| Descripción | LG1625AXF Laser Driver | |
| Fabricantes | Agere Systems | |
| Logotipo |  |
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Data Sheet
June 1999
Features
s High data-rate laser diode/LED driver
s Adjustable output current
s Operation up to 3 Gbits/s
s Single –5.2 V power supply
s 90 ps rise and fall times
Applications
s SONET/SDH transmission systems
s SONET/SDH test equipment
s Optical transmitters
LG1625AXF Laser Driver
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.
GND
MK
MK
VPRE
VIN LG1625AXF
VTH
VMOD
VSS3
VSS2
VSS1
IOUT
Figure 1. Functional Diagram
5-7865(F)
1 page  
Data Sheet
June 1999
LG1625AXF Laser Driver
Electrical Characteristics
TA = 25 °C, VSS1 = VSS2 = VSS3 = –5.2 V, VTH = –1.3 V, VMOD = –3.4 V, RL = 25 Ω, data input = 600 mVp-p.
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. Electrical Characteristics
Parameter
Symbol
Min
Typ
Max
Unit
Data Input Voltage
Voltage Control for Output Modulation
Current
Output Modulation Current
Minimum
Maximum*
Voltage Control for Prebias Current
Output Prebias Current
Minimum
Maximum†
Output Rise & Fall Times (20%—80%)
Rise
Fall
Power Supply Voltage
Power Supply Current‡
VINp-p
VMOD
IMOD LOW
IMOD HIGH
VPRE
IPRE LOW
IPRE HIGH
TRISE
TFALL
VSS1, VSS2, VSS3
ISS1
300
–5.5
—
55
–5.5
—
30
—
—
–4.9
50
600 2000
— –3.0
0
65
—
0
40
90
90
–5.2
100
2
—
–3.0
0.5
—
—
—
–5.5
120
mV
V
mA
mA
V
mA
mA
ps
ps
V
mA
* Maximum modulation at maximum VMOD
† Maximum prebias at maximum VPRE
‡ Excludes IPRE and average IMOD. Power supply current ISS2 (relating to prebias) is dependant on VPRE. Power supply current ISS3
(relating to modulation) is dependant on VMOD
Lucent Technologies Inc.
HORZ.: 100 pS/DIV., VERT.: 15 mA/DIV.
Figure 4. Typical Eye Diagram of IMOD
5-7869(F)
5
5 Page 
Data Sheet
June 1999
LG1625AXF Laser Driver
Appendix (continued)
Test Fixture Functional Description (continued)
VSS1
0.01 µF
VIN
6 5 4 32 1
8
24
9
23
10 22
MK 11
21
MK 12
20
13 14 15 16 17 18 19
FIXTURE BOUNDARY
PACKAGE OUTLINE
0.01 µF
0.01 µF
0.01 µF
0.01 µF
0.01 µF
0.01 µF
VSS1
VTH
VSS1
VMOD
VSS3
VSS2
0.01 µF
0.01 µF
VSS1 GND
IOUT
VPRE
Figure 10. TF1006A Electrical Diagram
5-7873(F)
Before Use of Test Fixture
s Due to possible stress during shipment, SMA connectors may be misaligned.
s Check each SMA for continuity.
s If necessary, realign and retighten with a 5/64 in. hex key wrench.
Instructions for Use of Test Fixture
A pair of flat-tip tweezers can be used to insert or remove a package from the test fixture. Always wear a grounding
strap to prevent ESD.
1. To insert a package, remove the two thumb screws and gently lift the pressure ring off of the test fixture.
2. Place the pressure ring, cavity side up, on a flat ESD safe surface.
3. Connect the metal tube to a suitable vacuum source with flexible tubing.
4. Place the package, lid down, on a flat ESD safe surface. Locate pin 1 on the package.
Lucent Technologies Inc.
11
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| PDF Descargar | [ Datasheet LG1625AXF.PDF ] | |
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