M02067 Datasheet, PDF (14/20 Pages) M/A-COM Technology Solutions, Inc. – Rise and fall times <150 ps

M02067 -12/-13
3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps
Rev V4
The MPC loop FAILure alarm (FAIL) is generated by the M02067 when the MPC loop can no longer maintain the
constant current set by R_MPCSET. When the MPC loop failure alarm is triggered the FAIL pin is asserted LOW.
3.5
Enable Control
The M02067 incorporates a dual polarity laser enable function with both enable (ENA) and disable (DIS) inputs.
Under normal operating conditions the ENA will be HIGH while DIS is LOW. Should ENA go LOW (or DIS go
HIGH) both the bias and modulation currents will be disabled.
Wire OR-ing the OCA and FAIL pins externally and connecting them to the ENA pin will automatically disable the
bias and modulation currents when a failure occurs.
3.6
Current Monitors
The M02067 features bias and modulation current monitor outputs. The BIAS_MON output sinks a current equal to
nominally 1/55 of the laser bias current (I_BIAS). The MOD_MON output sinks a current equal to nominally 1/55 of the
laser modulation current (I_MOD). BIAS_MON and MOD_MON should be connected through a pull-up resistor to V_CC.
Choose a pull-up resistor value that ensures a voltage at BIAS_MON greater than V_CC - 1.6V and a voltage at
MOD_MON greater than V_CC - 1.0V. These pins should be tied to V_CC if not used.
3.7
Slow-Start
For laser safety and reliability, the M02067 incorporates a slow-start circuit that provides a delay of approximately
200 ns before enabling the laser diode.
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