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CXB1818Q

Laser Diode Driver

Sony Semiconductor 

Laser Diode Driver

CXB1818Q

Description

The CXB1818Q is a high-speed monolithic Laser

Diode Driver/Current Switch with ECL/PECL input

level. Open collector outputs are provided at the

output pins (Q, QBX) and have the capacity of driving

modulation current of 50mAp-p at a maximum data

rate of 622Mbps. Along with the modulation current

generator there is the laser diode bias current

generator which has capacity of sourcing up to 60mA

(Bias). The laser diode bias current can be controlled

by either a voltage or current into the bias adjust pin

(BiasAdj) and the bias set pin (SBias), depending on

how these pins are configured. Control of the bias

current is achieved through the APC (Automatic

Power Control) circuit. In order to avoid having a

large current go through the laser diode, this IC also

provides an Activity detector function for laser

protection. The Activity detector circuit detects data

edge transitions and if no data transition occurs after

a certain period, then both the modulation and bias

currents are shutdown. The bias currents are shut it

down by in order to pull down the output voltage of

APC OP.Amp.

When the automatic shutdown is conducted, it is

possible to select whether the laser diode alarm

output is activated or not. Additionally, this IC has

the DFF for the input signal correction and the

internal Duty Cycle correction circuit that can control

the falling edge of the input pulse up to a maximum

of 1.0ns(Min.).

40 pin QFP (Plastic)

Applications

• SONET/SDH: 622Mbps

• Fibre channel: 531Mbps

Absolute Maximum Ratings

• Supply voltage VCC – VEE –0.3 to +6.0 V

• Input voltage VIN

VEE to VCC

V

• Differential input voltage

| VD – VDB |

0 to 2.5

V

• Bias output current

0 to 80 mA

• SBias input/output current

0 to 5

mA

• Bias control current

IBset (Ibiasadj) 0 to 5

mA

• Bbias control voltage

VBset (Vbiasadj) 0 to 3

V

• Modulation output current

70

mA

• Modulation adjust current

IQset (Idrvadj) 0 to 15 mA

• Storage temperature

Tstg

–65 to +150 °C

Features

• Maximum data rate (NRZ): 622Mbps

• Alarm and Shutdown function

• DFF for input signal correction

• Input signal Duty cycle correction

• Automatic Power Control (APC) for bias current

Recommended Operating Conditions

• DC supply voltage

VCC – VEE 3.14 to 3.46 V

• Operating ambient temperature

Ta

–40 to +85 °C

• Activity detector function for laser protection

• Alarm signal mask function during shutdown

• Differential PECL inputs or AC coupled inputs

Structure

Bipolar silicon monolithic IC

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by

any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the

operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

–1–

E99227-PS

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