Microchip SY88822V Handleiding

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M9999-040804

hbwhelp@micrel.com or (408) 955-1690

DESCRIPTION

The SY88822V features:

■Single 3.3V or 5V power supply

■Up to 155Mbps operation

■Modulation current to 30mA

■PECL output enable

■Dierential PECL inputs

■Available in a tiny 10-pin (3mm××

××

×3mm) MSOP

The SY88822V evaluation board features:

■User adjustable potentiometer to adjust

modulation current

■50Ω equivalent input network termination

■AC-coupled I/O with SMA connectors

FUNCTIONAL FEATURES

5V/3.3V 155Mbps

LASER DIODE DRIVER

WITH OUTPUT ENABLE

SY88822V

EVALUATION BOARD

AVAILABLE MEASUREMENTS

■Frequency performance

■Output eye pattern generation

■Mask testing

■Jitter

■Output rise/fall time

■BER testing

Rev.: AAmendment: /0

Issue Date:April 8, 2004

The SY88822V is a high-speed current switch for driving

a semiconductor laser diode in optical transmission

applications. The modulation current (IOUT) is controlled by

the current (IRSET) through the external resistor RSET. The

output OUT is HIGH and no current ows through OUT

when output enable is HIGH.

The device incorporates complementary open-collector

outputs with a 30mA maximum current driving capability.

The external resistor REXTmust be placed between /OUT

and VCCto dissipate the worst case power. RSER is

recommended to compensate for laser diode matching

issues. Pin 9 and pin 10 should be connected to achieve

better performance.

This manual provides information on the SY88822V

evaluation board. It should be used in conjunction with the

SY88822V datasheet, which contains full specications for

the SY88822V.

The SY88822V evaluation board enables fast and

thorough electrical evaluation of the SY88822V 155Mbps

laser diode driver with output enable. The board is an easy-

to-use, single-layer, high-speed microstrip design. It is

designed to be driven by a high-speed 155Mbps pattern

generator and provides on-board 50 equivalentΩ

terminations for the generator’s outputs. The input

termination network also provides the SY88822V's required

input bias of VCC–1.3V.

The board is intended to be terminated to a 50 scopeΩ

and provides for simple user adjustability of the modulation

current through the adjustment of an on-board potentiometer.

With the amplitude of the voltage waveform displayed on

the scope, the user can verify that the desired modulation

current is obtained through the equation:Imod(mA) =

Vamp(V)/ 0.025kΩ.

All data sheets and support documentation can be found

on Micrel’s web site at www.micrel.com.

EVALUATION BOARD

Figure 1.SY88822V Evaluation Board

Product specificaties