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MAX3668 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX3668
Description  3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Control
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
Logo MAXIM - Maxim Integrated Products

MAX3668 Datasheet(HTML) 6 Page - Maxim Integrated Products

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+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control
6
_______________________________________________________________________________________
MAX3668
DATA+
OUT+
OUT-
DATA-
100k
ENABLE
IMD
RAPCSET
RBIASMAX
RMODSET
APCSET
CAPC
CAPC
BIASMAX
MD
MODSET
FAIL
BIAS
IBIAS
165X
VCC
FAILURE
DETECTOR
40X
5X
Figure 3. Functional Diagram
Detailed Description
The MAX3668 laser driver consists of two main parts: a
high-speed modulation driver and a laser-biasing block
with Automatic Power Control (APC). The circuit is opti-
mized for low-voltage (+3.3V) operation.
The output stage is composed of a high-speed differential
pair and a programmable modulation current source.
Since the modulation output drives a maximum current
of 75mA into the laser with a 230ps edge speed, large
transient voltage spikes can be generated due to the
parasitic inductance. These transients and the laser for-
ward voltage leave insufficient headroom for the proper
operation of the laser driver if the modulation output is
DC-coupled to the laser diode. To solve this problem,
the MAX3668’s modulation output is designed to be
AC-coupled to the cathode of a laser diode. A simpli-
fied functional diagram is shown in Figure 3.
The MAX3668 modulation output is optimized for driv-
ing a 20
Ω 10Ω load; the minimum required voltage at
OUT+ is 2.0V. Modulation current swings of 75mA are
possible. To interface with the laser diode, a damping
resistor (RD) is required for impedance matching. An
RC shunt network may be used to compensate for the
laser-diode parasitic inductance, thereby improving the
optical output aberrations and duty-cycle distortion.
At a 622Mbps data rate, any capacitive load at the cath-
ode of a laser diode degrades the optical output perfor-
mance. Since the BIAS output is directly connected to the
laser cathode, minimize the parasitic capacitance associ-
ated with this pin by using an inductor to isolate the BIAS
pin from the laser cathode.


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