VSC7940 datasheet(3/16 Pages) VITESSE

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VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7940

SONET/SDH 3.125Gb/s

Laser Diode Driver with Automatic Power Control

G52357-0, Rev 3.2

Page 3

05/11/01

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

Internet: www.vitesse.com

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 Input

/Output Specifications

Absolute Maximum Ratings(1)

Power Supply Voltage (VCC)............................................................................................................. -0.5V to +7V

Current into BIAS.....................................................................................................................-20mA to +150mA

Current into OUT+, OUT- ...............................................................................................................................TBD

Current into MD ............................................................................................................................. -5mA to +5mA

Current into FAIL ......................................................................................................................... -10mA to 30mA

Voltage at DATA+, DATA-, CLK+, CLK-, ENABLE, LATCH......................................... -0.5V to (VCC + 0.5V)

Voltage at APCFILT, MODSET, BIASMAX, APCSET, MD, FAIL ............................................. -0.5V to +3.0V

Voltage at OUT+, OUT- ..................................................................................................... -0.5V to (VCC + 1.5V)

Voltage at BIAS .................................................................................................................. -0.5V to (VCC + 0.5V)

Continuous Power Dissipation (TA = +85°C, TQFP derate 20.8mW/°C above +85°C) .........................1350mW

Operating Junction Temperature Range ...................................................................................... -55°C to +150°C

Storage Temperature Range ........................................................................................................ -65°C to +165°C

NOTE: (1) CAUTION: Stresses listed under “Absolute Maximum Ratings” may be applied to devices one at a time without caus-

ing permanent damage. Functionality at or above the values listed is not implied. Exposure to these values for extended

periods may affect device reliability.

Recommended Operating Conditions

Positive Voltage Rail (VCC).............................................................................................................................. +5V

Negative Voltage Rail (GND) ............................................................................................................................ 0V

Ambient Temperature Range (TA).................................................................................................. -40°C to +85°C

Modulation Current Stability

-480

-50

480

ppm/

°C

IMOD=60mA

250

IMOD=5mA

ABIAS

BIASMON to IBIAS Gain

IBIAS/IBIASMON

AMOD

MODMON to IMON Gain

IMOD/IMODMON

Symbol

Parameter

Min

Typ

Max

Units

Conditions

VID

Differential Input Voltage

100

1600

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

VICM

Common-Mode Input Voltage

VCC -

1.49

VCC -

1.32

VCC -

VID/4

PECL-compatible

IIN

Clock and Data Input Current

-1

VIH

TTL Input High Voltage (ENABLE, LATCH)

2.0

VIL

TTL Input Low Voltage (ENABLE, LATCH)

0.8

TTL Output High Voltage (FAIL)2.4

VCC -

0.3

VCC

Sourcing 50µA

TTL Output Low Voltage (FAIL)

0.1

0.44

Sinking 100µA

Symbol

Parameter

Min

Typ

Max

Units

Conditions

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