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CXB1549 Datasheet

  • CXB1549

  • Laser Diode Driver

  • 221.18KB

  • 19頁(yè)

  • SONY   SONY

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CXB1549Q
Laser Diode Driver
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
鈥?/div>
Maximum data rate (NRZ): 1.25Gbps
鈥?/div>
Power on Reset function
鈥?/div>
Alarm and Shutdown function
鈥?/div>
Signal Duty cycle correction
鈥?/div>
Automatic Power Control (APC) for bias current
鈥?/div>
Activity detector function for laser safety
鈥?/div>
Power indicate function
鈥?/div>
Differential PECL inputs or AC coupled inputs
Application
鈥?/div>
Gbit-ethernet: 1.25Gb/s
鈥?/div>
SONET/SDH: 622Mb/s
鈥?/div>
Fibre channel: 532Mb/s, 1.062Gb/s
Absolute Maximum Ratings
鈥?/div>
Supply voltage Vcc 鈥?V
EE
鈥?.3 to +6.0
鈥?/div>
Input voltage
V
IN
V
EE
to Vcc
鈥?/div>
Differential input voltage
| V
D
鈥?V
DB
|
0 to 2.5
鈥?/div>
Bias output current
0 to 80
鈥?/div>
Modulation output current
0 to 70
鈥?/div>
SBias input/output current
0 to 5
鈥?/div>
Input bias control current
Iset (Ibiasadj)
0 to 5
鈥?/div>
Input bias control voltage
Vset (Vbiasadj)
0 to 3
鈥?/div>
Storage temperature
Tstg
鈥?5 to +150
Recommended Operating Conditions
鈥?/div>
DC power supply voltage
Vcc 鈥?V
EE
3.14 to 3.46
鈥?/div>
Operating ambient temperature
Ta
鈥?0 to +85
Structure
Bipolar silicon monolithic IC
V
V
V
mA
mA
mA
mA
V
擄C
40 pin QFP (Plastic)
V
擄C
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.
鈥?鈥?/div>
E98313B92-PS

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