MICREL SY100EL1003 Datasheet

LASER DIODE DRIVER

D

D

C

WITH OUTPUT ENABLE

PRELIMINARY

SY100EL1003

FEATURES

■ Up to 1.25Gbps operation

■ 75mA peak drive current

■ Separate modulation control

■ Separate output enable for laser safety

■ Differential inputs for data

■ 75KΩ input pulldown resistor

■ Single power supply

■ Available in 16-pin SOIC package

PIN CONFIGURATION

16

CC

V

15

NC

14

MC

13

OUT

12

OUT

11

V

BB

V

R

N
EN

N/C

SET

CCO

1

2

3

4

Top View

5

6

D

SOIC

Z16-2

DESCRIPTION

The SY100EL1003 is a high speed current source for
driving a semiconductor laser diode in optical transmission
applications. The output current modulation is DC –
voltage controlled. The modulation current is disabled
when output enable is HIGH.

The device incorporates complementary open collector
outputs with a capability of driving peak current of 75mA.
The laser driver current is adjustable by selection of RSET.
The resistor REXT must be placed between OUT and
VCC to dissipate the worst case power. RSER is
recommended to fix laser diode matching issues.

The SY100EL1003 utilizes the high performance
bipolar ASSET technology.

7

D

8

NC

BLOCK DIAGRAM

EN

10

NC

9

V

EE

V

BB

Internal Logic

BIAS

Control

MC

Modulation Control

R

SET

V

CC

R

EXT

OUT

OUT

R

SER

to Laser Diode

R

SET

V

EE

Rev.: D Amendment: /0

1

Issue Date: August, 1998

Micrel

PRELIMINARY

SY100EL1003

PIN NAMES

Pin Function

V

CC, VCCO Separate positive power supply pins help

to isolate sensitive circuitry from noise
generating function. +5V for PECL operation
or ground for ECL operation.

EE Most negative power supply input. Ground

V

for PECL operation or -5V for ECL operation.

BB This pin provides a reference voltage for use

V

in single ended applications or when the
input signal is AC coupled into the device.

D,D These differential ECL/PECL 100K

compatible inputs receive NRZ data.

EN This ECL/PECL 100K compatible input enables

Laser Driver - modulation current transitions to
zero when asserted HIGH.

OUT, OUT Open collector outputs from the modulation

buffer drive these differential current outputs.

MC An external voltage sets the main value of

modulation current IO.

SET An external resistor sets the source current

R

for modulation Imod.

NC These pins are not connected.

TRUTH TABLE

(1)

D D EN OUT OUT

LHLHL
HLLLH
XXHHL

NOTE:

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

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Rating Value Unit

VEE Power Supply Voltage (VCC = 0V) 0 to -7.0 V
VI Input Voltage (VCC = 0V) 0 to -6.0 V
IO Output Current 75 mA
TA Operating Temperature Range –40 to +85°°C

tot Power Dissipation 500 mW

P

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.

OPERATIONING CONDITIONS

(1)

Symbol Rating Value Unit

VEE Power Supply Voltage –4.75 to -5.25 V
RSET Resistor to Adjust Current 10 to 100 Ω
REXT Resistor to Dissipate Power 10 to 50 Ω
R

SER Laser Diode Serial Resistor 0 to 50 Ω

NOTE:

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

2