MAX3669ETG+

MAX3669ETG+ is a complete, +3.3V laser driver with automatic power control (APC) circuitry for SDH/SONET applications up to 622Mbps. An APC feedback loop is incorporated to maintain a constant average optical power over temperature and lifetime. The wide modulation current ranges from 5mA to 75mA and bias current of 1mA to 80mA are easy to program, making this product ideal for use in various SDH/SONET applications. Two pins are provided to monitor the current levels in the laser: BIASMON with current proportional to laser bias current, and MODMON with current proportional to laser modulation. It also provides enable control and a failure monitor output to indicate when the APC loop is unable to maintain the average optical power. It is used in applications such as 622Mbps SDH/SONET access nodes, laser driver transmitters, and section regenerators.

• 3.3V or +5.0V single-supply operation, enable control
• Bias current and modulation current monitors
• Automatic average power control with failure monitor
• Complies with ANSI, ITU, and bellcore SONET/SDH specifications
• Supply current is 40mA typical at (VCC = +3.14V to +5.5V, TA = -40°C to +85°C)
• Bias off current is 100µA maximum at (ENABLE = low, VCC = +3.14V to +5.5V)
• Modulation current stability is -165ppm/°C typical at (IMOD = 75mA, TA = +25°C)
• Output rise/fall time is 100ps typical at (20% to 80%, RL = 10 ohm/20 ohm load, IMOD = 5mA)
• Pulse-width distortion (peak-to-peak) is 70ps typical at (IMOD = 5mA, TA = +25°C)
• Operating temperature range from -40°C to +85°C, 24-pin TQFN-EP package

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