LG1626DXC 데이터 시트보기 (PDF) - Agere -> LSI Corporation

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LG1626DXC

Modulator Driver

Agere -> LSI Corporation 

LG1626DXC Modulator Driver

Electrical Characteristics (continued)

Data Sheet

February 1999

VSS = –5.2 V

10 Ω

0.1 µF

2.5 kΩ*

VTH

+ 50 Ω

DATA IN 0.047 µF

VIN

Zo = 50 Ω

0.047 µF

50 Ω

0.1 µF

DATA

GENERATOR

2.5 kΩ

10 Ω

24 23 22 21 20 19

1

18

2

17

LG1626DXC

3

MODULATOR 16

4

DRIVER

15

5

14

6

13

7 8 9 10 11 12

BG2P5

10 Ω

0.1 µF

VOUT-DC

VOUT

Zo = 50 Ω

50 Ω

SCOPE

VSS

CURRENT

SENSE

1Ω

TO USER-SUPPLIED

VOLTAGE MONITOR

(DVM).

LM4040

MOD_5

VSS = –5.2 V

MK MK

BYPASS

FOR VSS1

VSS

VOLTAGE

DIVIDER

VSS

2 kΩ

0.1 µF

TO NODE

VSS2 AND VSS3

ONE EACH.

0.1 µF

VSS1

3 kΩ

0.1 µF

REQUIRED TO SET

VMOD AND VDC-ADJ

TO ACHIEVE DESIRED

MODULATION, ONE EACH.

5-6553(F).b

*A 2.5 kΩ resistor will set the eye crossing at 50%. A 5 kΩ potentiometer will allow the eye crossing to be varied.

Notes:

All bypass caps should be mounted close to the package.

ISS3 can be measured and used to control VMOD.

ISS2 can be measured and used to control VOUT-DC.

For optimal performance, the proximity of the two components should be minimized and the package bottom must be soldered to the circuit

board (GND).

For proper impedance matching, high-speed transmission lines should be 50 Ω controlled impedance lines.

Figure 4. LG1626DXC Typical Electrical Evaluation (ac Coupled to Scope)

6

Lucent Technologies Inc.

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