SY88902 datasheet(2/8 Pages) MICREL

2 / 8 page

SY88902

Micrel

Function

VCC

Most positive power supply input, +5V for PECL

operation.

GND

Ground

DIN, /DIN

These differential PECL 100K compatible inputs

receive NRZ data.

/EN

This PECL 100K compatible input enables

Laser Driver. Modulation current goes to zero

when asserted HIGH.

OUT, /OUT

Open collector outputs from the modulation

buffer drive these differential current outputs.

VREF

Voltage reference for use with RSET.

RSET

An external resistor sets up the source current

for modulation Imod.

/EN

OUT (2)

/OUT

LLL

NOTES:

1. L = LOW, H = HIGH, X = don't care

2. H = IOUT = OmA

PIN NAMES

TRUTH TABLE(1)

Symbol

Rating

Value

Unit

VCC

Power Supply Voltage

0 to +7.0

Input Voltage

0 to VCC

Output Current

Operating Temperature Range

0 to +85

°C

Tstore

Storage Temperature Range

–55 to +125

°C

Ptot

Power Dissipation

250

ABSOLUTE MAXIMUM RATINGS(1)

NOTE:

1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied

at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended

periods may affect device reliability.

Symbol

Rating

Value

Unit

VCC

Power Supply Voltage

+4.5 to +5.5

REXT

Resistor to Dissipate Power

10 to 50

Ω

RSER

Laser Diode Serial Resistor

0 to 50

Ω

RSET

Resistor to Adjust Current

1500 to 50,000

Ω

ΘJA

Thermal Resistance of Package to Ambient(2)

206

°C/W

COUT

Capacitance on OUT + /OUT

2.5 typical

OPERATIONING CONDITIONS(1)

NOTES:

1. The voltage drop across REXT and RSER plus Laser Diode should not be greater than 2V.

2. Still air without heatsink.

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