VSC7939W 查看數據表（PDF） - Vitesse Semiconductor

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VSC7939W

SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7939

SONET/SDH 3.125Gb/s

Laser Diode Driver with Automatic Power Control

Symbol

Parameter

Min Typ Max Units

Conditions

Modulation Current Absolute Accuracy

±15

% See Note 2

Modulation Current Stability

ABIAS

AMOD

BIASMON to IBIAS Gain

MODMON to IMON Gain

-480 -50

250

37

29

480 ppm/°C IMOD=60mA

IMOD=5mA

A/A IBIAS/IBIASMON

A/A IMOD/IMODMON

NOTES: (1) Both IBIAS and IMOD will turn off if any of the current set pins are grounded. (2) Assumes laser diode to monitor diode transfer func-

tion does not change with temperature.

Table 3: PECL and TTL/CMOS Inputs and Outputs Specifications

Symbol

VID

VICM

IIN

VIH

VIL

Parameter

Differential Input Voltage

Common-Mode Input Voltage

Clock and Data Input Current

TTL Input High Voltage

(ENABLE, LATCH)

TTL Input Low Voltage

(ENABLE, LATCH)

TTL Output High Voltage (FAIL)

TTL Output Low Voltage (FAIL)

Min

100

VCC -

1.49

-1

2.0

Typ

VCC -

1.32

Max

1600

VCC -

VID/4

10

Units

Conditions

mVp-p (DATA+)-(DATA-)

V PECL-compatible

µA

V

0.8

2.4

VCC -

0.3

VCC

0.1

0.44

V

V Sourcing 50µA

V Sinking 100µA

G52350-0, Rev 3.2

02/26/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

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