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Sony Semiconductor Electronic Components Datasheet

CXB1549Q Datasheet

Laser Diode Driver

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CXB1549Q pdf
Laser Diode Driver
CXB1549Q
Description
The CXB1549Q 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 max. data rate of
1.25Gbps (Min.). Along with the modulation current
generator there is the laser diode bias generator
which has capacity of sourcing up to 60mA (Bias).
The laser diode 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 diode bias current
is achieved through the APC (Automatic Power
Control) circuitry. In order to avoid having a large
current go through the laser diode, this IC also
provides an Activity detector and Power on Reset
functions for Laser Safety. The Activity detector
circuit detects data edge transitions and if no data
transition occur after a certain time period, then both
the modulation and bias current are shutdown.
The Power on Reset circuit holds the modulation
and bias current off for a set period of time while the
system power is applied. Additionally, this IC has an
internal Duty Cycle correction circuit that can control
the falling edge of the input pulse up to a maximum
of 0.2ns (Min.).
Features
Maximum data rate (NRZ): 1.25Gbps
Power on Reset function
Alarm and Shutdown function
Signal Duty cycle correction
Automatic Power Control (APC) for bias current
Activity detector function for laser safety
Power indicate function
Differential PECL inputs or AC coupled inputs
40 pin QFP (Plastic)
Application
Gbit-ethernet: 1.25Gb/s
SONET/SDH: 622Mb/s
Fibre channel: 532Mb/s, 1.062Gb/s
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
Modulation output current
0 to 70
SBias input/output current
0 to 5
Input bias control current
Iset (Ibiasadj) 0 to 5
Input bias control voltage
Vset (Vbiasadj) 0 to 3
Storage temperature
Tstg –65 to +150
V
V
V
mA
mA
mA
mA
V
°C
Recommended Operating Conditions
DC power supply voltage
Vcc – VEE
3.14 to 3.46
Operating ambient temperature
Ta –40 to +85
V
°C
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–
E98313B92-PS


Sony Semiconductor Electronic Components Datasheet

CXB1549Q Datasheet

Laser Diode Driver

No Preview Available !

CXB1549Q pdf
Block Diagram and Pin Assignment
CXB1549Q
LDAlm 31
30
SDN 32
SDNB 33
VREF 34
TEST_PIN 35
VCC3 36
CapZ 37
VEE3 38
APCOut 39
RsetPD 40
VREF
Power on
Reset
12
29 28 27 26
25 24 23 22
21
Reference
Generator
VBB
Generator
Duty Cycle
Cont
In_ALM
20 ADCDis
19 TM
18 NC
17 Timer
16 CompB
DRV Cont
15 CompA
14 DrvAdj
13 DrvMon
Bias
Circuit
34 5 6
7 8 9 10
12 VEE1
11 VCC1
–2–


Part Number CXB1549Q
Description Laser Diode Driver
Maker Sony Corporation
Total Page 19 Pages
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CXB1549Q Datasheet PDF
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