Micrel SY88822V User Manual

查询SY88822V供应商

Micrel

5V/3.3V 155Mbps
LASER DIODE DRIVER
WITH OUTPUT ENABLE

SY88822V

SY88822V

FEATURES

■ Single 3.3V or 5V power supply

■ Up to 155Mbps operation

■ Modulation current to 30mA

■ PECL output enable

■ Differential PECL inputs

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

APPLICATIONS

■ 155Mbps SONET

DESCRIPTION

The SY88822V is a high speed current switch for driving
a semiconductor laser diode in optical transmission
applications. The modulation current (I
the current (I

) through the external resistor R

RSET

output OUT is HIGH and no current flows through OUT
when output enable is HIGH.

The device incorporates complementary open collector
outputs with a 30mA maximum current driving capability.
The external resistor R

must be placed between /OUT

EXT

and VCC to dissipate the worst case power. R
recommended to compensate for laser diode matching
issues. Pin 9 and pin 10 should be connected to achieve
better performance.

The SY88822V utilizes the high performance bipolar
ASSET™ technology.

) is controlled by

OUT

SET

. The

SER

is

FUNCTIONAL BLOCK DIAGRAM

DIN

/DIN

/EN

Internal

Logic

V

REF

V

CC

R

EXT

/OUT

OUT

R

SER

to Laser Diode

I

MOD

40X

GND

R

SET

R

SET

V

CC

GND

ASSET is a trademark of Micrel, Inc.

Rev.: A Amendment: /0

1

Issue Date: March 2003

Micrel

PACKAGE/ORDERING INFORMATION

SY88822V

Ordering Information

Package Operating Package

DIN

/DIN
VREF
RSET VCC65

1/EN
2
3
4

10 OUT

OUT

9

/OUT

8

GND

7

Part Number Type Range Marking

SY88822VKC K10-1 Commercial 822V
SY88822VKCTR* K10-1 Commercial 822V
SY88822VKI K10-1 Industrial 822V
SY88822VKITR* K10-1 Industrial 822V

10-Pin MSOP

*Tape and Reel

(K10-1)

PIN DESCRIPTION

Pin Number Pin Name Pin Function

1 /EN 100k PECL compatible input w/ 75kΩ pulldown resistor. Modulation current goes to zero

when deasserted high.

2, 3 DIN, /DIN Differential 100k PECL compatible input w/ 75kΩ pulldown resistors.

4 VREF Voltage reference for use with R
5 RSET An external resistor from here to V
6 VCC Positive power supply.
7 GND Device ground.

8, 9, 10 /OUT, OUT Differential open collector current outputs.

.

SET

sets the reference current for I

REF

OUT

.

TRUTH TABLE

D /D /EN OUT

(Note1)

(Note 2)

/OUT

LHLHL
HLLLH
XXHHL

Note 1. L = LOW, H = HIGH, X = don't care.
Note 2. H = I

OUT

= 0mA.

2