SY88902KCTR [MICREL]

LASER DIODE DRIVER WTIH OUTPUT ENABLE; 激光二极管驱动器WTIH OUTPUT ENABLE


型号：	SY88902KCTR
厂家：	MICREL SEMICONDUCTOR
描述：	LASER DIODE DRIVER WTIH OUTPUT ENABLE 激光二极管驱动器WTIH OUTPUT ENABLE 驱动器二极管激光二极管输出元件
文件：	总8页 (文件大小：81K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LASER DIODE

DRIVER WTIH

SY88902

OUTPUT ENABLE

DESCRIPTION

FEATURES

■ Up to 1.25Gbps operation

The SY88902 is a high speed current switch for driving

a semiconductor laser diode in optical transmission

applications. The output current, or modulation current

IMOD, is DC current controlled by IRSET, current through

the resistor RSET. The output OUT is HIGH when output

enable is HIGH.

■ 25mA peak drive current

■ Separate modulation control

■ Separate output enable for laser safety

■ Differential inputs for data

The device incorporates complementary open collector

outputs with a capability of driving peak current of 25mA.

The resistor REXT must be placed between /OUT and

VCC to dissipate the worst case power. RSER is

recommended to compensate for laser diode matching

issues.

■ 75KΩ input pulldown resistor

■ Single power supply

■ Designed for use with SY88903 and SY88904

■ Available in a tiny 10-pin (3mm) MSOP

The SY88902 utilizes the high performance bipolar

ASSET™ technology.

APPLICATIONS

PIN CONFIGURATIONS

■ 1.25Gbps Gigabit Ethernet

■ 531Mbps and 1062Mbps Fibre Channel

■ 622Mbps SONET

/EN

10 VCC

/DIN

REF

SET

OUT

/OUT

GND

MSOP

K10-1

■ Gigabit Interface Converter

BLOCK DIAGRAM

VCC

REXT

OUT

RSER

DIN

Internal Logic

DIN

to Laser Diode

IMOD

BIAS

Control

40X

VCC

GND

Modulation Control

VEE

RSET

VREF

RSET

Rev.: C

Amendment:/1

Issue Date: July 2000

Micrel

SY88902

(1)

PIN NAMES

TRUTH TABLE

Function

/EN

OUT ⁽²⁾

/OUT

VCC

Most positive power supply input, +5V for PECL

operation.

GND

Ground

DIN, /DIN

These differential PECL 100K compatible inputs

receive NRZ data.

NOTES:

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

2. H = IOUT = OmA

/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

RSET

Voltage reference for use with RSET.

An external resistor sets up the source current

for modulation Imod.

(1)

ABSOLUTE MAXIMUM RATINGS

Symbol

VCC

Rating

Value

0 to +7.0

0 to VCC

Unit

Power Supply Voltage

Input Voltage

Output Current

°C

Operating Temperature Range

Storage Temperature Range

Power Dissipation

0 to +85

–55 to +125

250

Tstore

Ptot

°C

NOTE:

1. PermanentdevicedamagemayoccurifABSOLUTEMAXIMUMRATINGSareexceeded. Thisisastressratingonlyandfunctionaloperationisnotimplied

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.

(1)

OPERATIONING CONDITIONS

Symbol

VCC

Rating

Value

+4.5 to +5.5

10 to 50

Unit

Power Supply Voltage

REXT

RSER

RSET

ΘJA

Resistor to Dissipate Power

Ω

Laser Diode Serial Resistor

0 to 50

Ω

Resistor to Adjust Current

1500 to 50,000

206

Ω

Thermal Resistance of Package to Ambient⁽²⁾

Capacitance on OUT + /OUT

°C/W

COUT

2.5 typical

NOTES:

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

2. Still air without heatsink.

Micrel

SY88902

DC ELECTRICAL CHARACTERISTICS

GND = 0V; VCC = +5.0V ±10%; TA = 0˚C to + 85˚C

TA = 0°C

TA = +25°C

TA = +85°C

Symbol

Parameter

Min.

Typ.

—

Max.

Min.

Typ.

Max.

Min.

CC-1165

Typ.

Max.

Unit

VIH

Input HIGH Voltage

(DIN, /DIN, /EN)

CC-1165

CC-880

CC-1165

—

CC-880

—

CC-880

VIL

Input LOW Voltage

(DIN, /DIN, /EN)

VCC-1810

—

VCC-1475 VCC-1810

—

VCC-1475 VCC-1810

—

VCC-1475 mV

VREF

IIL

Reference Voltage

—

3.12

—

3.00

—

2.80

—

Input LOW Current⁽¹⁾

(DIN, /DIN, /EN)

0.5

—

0.5

—

0.5

—

IIH

Input HIGH Current

(DIN, /DIN, /EN)

—

100

—

100

—

100

ICC

IOL

Supply Current⁽²⁾

—

Output LOW Current

(/EN = HIGH)

—

500

—

500

—

500

IOUT

IRSET

Modulation Current

Modulation Control

=IOUT/IRSET

—

0.625

—

0.625

—

0.625

—

0.125

ARSET

NOTES:

1. VI = VIL(Min.)

2. IMOD = 25mA.

(1)

AC ELECTRICAL CHARACTERISTICS

IMOD =10mA; GND = 0V; VCC = +5V ±10%; TA = 0˚C to + 85˚C

TA = 0°C TA = +25°C

Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit

TA = +85°C

Symbol

Parameter

Conditions

tpd D

Propagation Delay

DIN - OUT

—

1000

—

500 1000

—

1000

—

IMOD = 10mA

tpd EN

Propagation Delay

/EN - OUT

—

450 1000

—

IMOD = 10mA

Rise/Fall Time

(20% to 80%)

200

—

200

—

200

—

IOR

Output Current Ringing⁽²⁾

—

NOTES:

1. REXT = RSER = 50Ω ±1%, RSER connects to VCC directly without Laser Diode.

2. IOH = 5 to 25mA

Micrel

SY88902

APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION

GBIC Terminal

Micrel

SY88902

APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION

Gigabit EthernetTerminal

Micrel

SY88902

PERFORMANCE CURVES

and

RSET

0.0

8.0K

10K

4.0K

12K

2.0K

6.0K

0.0

RSET (ohm)

PRODUCT ORDERING CODE

Ordering

Code

Package

Type

Operating

Range

SY88902KC

K10-1

Commercial

SY88902KCTR

Micrel

SY88902

10 LEAD MSOP (K10-1)

Rev. 00

Micrel

SY88902

MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA

TEL + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

SY88902KCTR [MICREL]

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