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Sony Semiconductor Electronic Components Datasheet

CXB1818Q Datasheet

Laser Diode Driver

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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
Input voltage VIN
VEE to VCC
Differential input voltage
| VD – VDB |
0 to 2.5
Bias output current
0 to 80
SBias input/output current
0 to 5
Bias control current
IBset (Ibiasadj) 0 to 5
Bbias control voltage
VBset (Vbiasadj) 0 to 3
Modulation output current
70
Modulation adjust current
IQset (Idrvadj) 0 to 15
Storage temperature
Tstg –65 to +150
V
V
V
mA
mA
mA
V
mA
mA
°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
Operating ambient temperature
Ta –40 to +85
V
°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


Sony Semiconductor Electronic Components Datasheet

CXB1818Q Datasheet

Laser Diode Driver

No Preview Available !

Block Diagram and Pin Configuration
CXB1818Q
30 29
28 27
Reference
Generator
26
25 24 23
22 21
Vbb
Gen.
20 ClkB
Tset 31
VREF 32
Vref
VCC6 33
LDAlm 34
LDAlmB 35
VCC3 36
VEE3 37
WCompIn 38
RsetPD 39
APCOut 40
Bias
Circuit
1 2 3 45
D-FF
MUX
In_ALM
Duty Cycle
Cont
DRV
Cont
19 FFSel
18 ADCDis
17 Timer
16 CompB
15 CompA
14 DrvAdj
13 DrvMon
12 TM
6 7 89
11 VCC1
10
–2–


Part Number CXB1818Q
Description Laser Diode Driver
Maker Sony Corporation
Total Page 17 Pages
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