GD16521 datasheet(1/13 Pages) ETC

номер детали	GD16521

подробное описание детали	2.5 GBIT/S RE TIMING LASER DRIVER

PDF	13 Pages

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производитель	ETC [List of Unclassifed Manufacturers]

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General Description

The GD16521 is a high performance low

power 2.5 Gbit/s Laser Driver with

optional on chip re-timing of data.

The GD16521 is designed to meet and

exceed ITU-T STM-16 and SONET

OC-48 fiberoptic communication systems

requirements.

The GD16521 is designed to sink a Mod-

ulation Current into the IM pin and a

Pre-Bias Current into the IB pin. The

Modulation Current is adjustable up to

50 mA and the Pre-Bias Current is ad-

justable up to 100 mA. The device fea-

tures two control loops for stabilizing the

laser diode operating conditions. An au-

tomatic optical power control loop main-

tains a constant average optical power

out of the laser diode, independent of

changes in the threshold current of the

laser diode. A modulation current control

loop maintains a constant modulation

current for the laser diode, or alterna-

tively maintains a constant extinction ra-

tio of the laser diode.

Re-timing of the data signal connected to

the pins SDIP/SDIN is made by means of

a DFF-clocked by an external clock sig-

nal at the data rate fed to the pins SCIP/

SCIN.

The GD16521 requires a single +3.3 V

supply.

The circuit is available as:

u

48 lead7×7mm TQFP power

enhanced plastic package

u

die.

an Intel company

Data Sheet Rev.: 11

Preliminary

Features

l

Differential CML data and clock

inputs with internal 50 W load termi-

nation.

l

Selectable on chip retiming-FF.

l

Output modulation current pulse duty

width adjustable

(Compensates for LD emission delay)

l

Modulation/Bias current monitor

output.

l

Modulation/Bias current shutdown

input.

l

Single supply operation: +3.3 V.

l

Power dissipation: 410 mW (typ.).

l

Available as:

– 48lead7×7mm TQFP power

enhanced plastic package

– die

Applications

l

Tele Communication:

– SDH STM-16 modules

– SONET OC-48 modules

l

Data Communication.

l

Electro Absorption laser driver.

l

Direct Modulation laser driver.

2.5 Gbit/s

Re-timing

Laser Driver

GD16521

PD

AR

IB

IBM

IM

DUTY

FFSET

SHDW

MARKN

SDlP

TDlN

TDlP

SClP

SDlN

SClN

TClP

TClN

IMC

IMM

IMSET

MARKP

1/20

DFF

SEL

Duty

Adjust

Mark/Space

Monitor

1/20

IBSET

OPSET

VCC

VCCCONT

VCCCM

VCCR

VEE

VEER

MTJ

IMB

-

+

+-

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