CXB1828ER Datasheet, PDF (1/20 Pages) Samsung semiconductor – 2.5Gbps Laser Diode Driver

2.5Gbps Laser Diode Driver
CXB1828ER
Description
The CXB1828ER is a high-speed monolithic laser
diode driver. This IC can drive the data rate of 2.5Gbps
and the modulation current of up to 50mA. The bias
current of up to 50mA can be supplied and it is
controlled by the built-in APC (automatic power
control). The modulation current and bias current are
designed to be linearly controlled by the voltage input
to the control pin.
This IC has a built-in DFF, and through mode or DFF
mode can be selected. In through mode the signal
goes as it is, and in DFF mode the input signal is
retimed by the external clock. The data input pin and
the clock input pin can accept the differential input of
PECL and CML, and the 50Ω termination resistors are
provided in the IC.
The shutdown function which shuts down the
modulation current and bias current, the activity error
detect circuit which detects that the signal has no
input, and the alarm output power-on reset circuit.
Furthermore, the duty cycle control circuit which
corrects the modulation output signal duty is
included in this IC.
The CXB1828ER employs the 4.8mm × 4.8mm
of 32-pin plastic package, contributing to the
miniaturization of the optical mode.
Features
• Direct laser diode drive
• Maximum data rate of 2.5Gbps
• Power-on reset function
• Automatic power control (APC) for bias current
• Alarm function and shutdown function
• Differential PECL and CML inputs or AC coupled
input
• Internal duty cycle correction circuit
• Activity error detector function for laser safety
• Typical rise time is 80ps.
• Built-in 50Ω input termination resistor
• Compact package size: 4.8mm × 4.8mm
• Single +3.3V supply voltage
32 pin VQFN (Plastic)
Absolute Maximum Ratings
• Supply voltage Vcc – VEE –0.3 to +6.0 V
• Data and clock input voltage difference
|VD – VDN|
2.5
V
• Bias output current
100 mA
• Modulation output current
100 mA
• Storage temperature
Tstg
–65 to +150 °C
Recommended Operating Conditions
• Supply voltage Vcc – VEE 3.14 to 3.46 V
• Operating ambient temperature
Ta
–40 to +85 °C
Important Notes
The IC requires SLOW turning power on and off.
See Vcc rise and fall time in AC characteristics.
Electrostatic Strength
This IC has a very sensitive electrostatic strength,
so care should be taken for handling.
Typical Transmit Block Diagram
Transmit Path
Sony
CXB1828ER
Sony
SerDes
Applications
• Gigabit ethernet: 1.25Gbps
• SONET/SDH: 622Mbps, 2.5Gbps
Laser Diode
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.
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