LG1625AXF Просмотр технического описания (PDF) - Agere -> LSI Corporation

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LG1625AXF

Laser Driver

Agere -> LSI Corporation 

LG1625AXF Laser Driver

Test Circuit

MK MK VSS –5.2 V VSS –5.2 V

Data Sheet

June 1999

50 Ω

+

DATA

GENERATOR

12

11

MK

18

MK

21

VPRE

0.1 µF 2

24

VMOD

VIN LG1625AXF

IOUT

VSS3

VSS2

20

VTH

VSS1

19

VTH

IPRE IF VPRE > –5.0 V

16

IMOD

50 Ω

xx

50 Ω

SCOPE

20 Ω

7

0.1 µF

20 Ω

1Ω

IMOD

MONITOR

1Ω

IPRE

MONITOR

Notes:

GND pins 3, 4, 5, 8, 9, 10, 14, 15, 17.

VSS1 pins 1, 6, 13, 22, 23.

VSS –5.2 V

Figure 5. LG1625AXF Typical Test Circuit

5-7876(F)r.1

LG1625AXF Application Notes

s VSS bypass capacitors should be mounted close to the package.

s 5000 Ω potentiometer is typically set for 2500 Ω. This establishes an approximate –1.3 V VTH which will track

with VSS.

s Mark density (MK and MK) outputs are terminated with 1 kΩ pull-up resistors.

s IMOD and IPRE can be measured and used to control VMOD and VPRE.

6

Lucent Technologies Inc.

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