Datasheet SY100EL1003 Datasheet (MICREL)

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

Micrel

PRELIMINARY

SY100EL1003

DC ELECTRICAL CHARACTERISTICS

(1)

VCC = VCCO = 0V; VEE = -5.0V ± 5%

TA = –40°CTA = 0°CTA = +25°CTA = +85°C

Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit

VIH Input HIGH Voltage -1165 — -880 -1165 — -880 -1165 — -880 -1165 — -880 mV

(D, EN)

IL Input LOW Voltage -1810 — -1475 -1810 — -1475 -1810 — -1475 -1810 — -1475 mV

V

(D, EN)

Imod Input Voltage VEE — VCC VEE — VCC VEE — VCC VEE — VCC V

V

(Modulation Control)

BB Output Reference -1380 — -1260 -1380 — -1260 -1380 — -1260 -1380 — -1260 mV

V

Voltage

IH Input HIGH Current ——150 ——150 ——150 ——150 µA

I

(D, EN)

I

Imod Input Current ——150 ——150 ——150 ——150 µA

(Modulation Control)

(3)

(2)

(4)

0.5 —— 0.5 ——0.5 ——0.5 ——µA

8 14 25 8 14 25 8 14 25 8 14 25 mA

60 64 68 60 64 68 60 64 68 60 64 68 mA

—— 5 —— 5 —— 5 ——5

(6)

——10 ——10 ——10 ——10 %

IL Input LOW Current

I

(D, EN)

ICC Supply Current

OH Output HIGH Current

I

(EN LOW)

OL Output LOW Current ——500 ——500 ——500 ——500 µA

I

(5)

(EN HIGH)

IOR Output Current Ringing

Omod Laser Diode Modulation 5 — 60 5 — 60 5 — 60 5 — 60 mA

I

Current Range

NOTES:

1. RSET = 10Ω ± 1%

2. VI = VIL(Min.)

3. VImod = VCC

4. VImod = -3.5V

5. VLmod = -0.8V

6. IOH = 5 to 60mA

AC ELECTRICAL CHARACTERISTICS

(1)

VImod = –1.5V; VCC = VCCO = 0V; VEE = –5V ± 5%

TA = –40°CTA = 0°CTA = +25°CTA = +85°C

Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit

tpd D Propagation Delay ——1000 ——1000 ——1000 ——1000 ps

D - OUT

pd EN Propogation Delay ——1000 ——1000 ——1000 ——1000 ps

t

EN - OUT

r Rise/Fall Time ——400 ——400 ——400 ——400 ps

t
tf (20% to 80%)

NOTE:

1. RSET = 10Ω ± 1%, REXT = RSER = 50Ω ± 1%

3

Micrel

PERFORMANCE CURVES

70

PRELIMINARY

SY100EL1003

IO vs. TA and Vmod

60

IO (mA)

50

40

30

20

10

0

TA = 0˚C
TA = 25˚C
TA = 70˚C

2.0 3.0 4.0 5.00 1.0

-Vmod (V)

PRODUCT ORDERING CODE

Ordering Package Operating

Code Type Range

SY100EL1003ZC Z16-2 Commercial
SY100EL1003ZCTR Z16-2 Commercial

4

Micrel

APPLICATION EXAMPLE

NOTES:

1. Split 100K ECL terminations are 82Ω and 130Ω to V

2. Recommended power supply bypass capacitors are 0.1µF with optional 10µF Tantalum in parallel.

3. It is required to use high frequency design techniques for board layout. A double sided or multilayer board is recommended i

4. V
impedance ground plane and properly terminated transmission lines for all signal paths.

BB

voltage pin may be used as reference for single ended input applications.

INPUTS

50Ω COAX

50Ω COAX

PRELIMINARY

SY100EL1003

50Ω COAX

CC

and V

EE

respectively.

V

CC

= 0V

n conjunction with a low

V

EE

= –5.0V

1

2

IC
= IC

= LM324

10k

V

CC

24Ω

V

EE

V

CC

V

EE

0.1µF

130Ω

R

SET

V

EE

R

SET

EN

D

D

SY100EL1003

V

CC

V

CCO

V

CC

82Ω

MC

10k

V

EE

0.1µF

1kΩ

V

CC

0.02µF

V

CC

1kΩ

IC

2

–

+

750Ω

47kΩ

10Ω

LASER BIAS / APC CONTROL

470kΩ

0.1µF

0.1µF

A

V

CC

V

EE

0.1µH

R

SER

OUT

OUT

V

CC

R

EXT

LASER MODULE

V

EE

47kΩ

10kΩ

1kΩ

4.7kΩ

IC

1

+

–

47kΩ

B

5

Micrel

16 LEAD SOIC .150" WIDE (Z16-2)

PRELIMINARY

SY100EL1003

Rev. 02

MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA

TEL + 1 [phone] FAX + 1 [phone] WEB http://www.micrel.com

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© 2000 Micrel Incorporated

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