GENERAL DESCRIPTION
The TZA3047 is a fully integrated laser driver for optical transmission systems with data rates up to 1.25 Gbits/s. The TZA3047 incorporates all the necessary control and protection functions for a laser driver application with very few external components required and low power dissipation. The dual-loop controls the average monitor current in a programmable range from 150 µA to 1300 µA and the extinction ratio in a programmable range from 5 to 15 (linear scale).

FEATURES
General
• 30 Mbits/s to 1.25 Gbits/s
• Bias current up to 100 mA
• Modulation current up to 100 mA
• Rise and fall times typical 120 ps
• Jitter below 30 ps (peak-to-peak value)
• Modulation output voltage up to 2 V dynamic range
• 1.2 V minimum voltage on the modulation output pin and 0.4 V minimum voltage on pin BIAS
• Retiming function via external clock with disable option
• Pulse width adjustment function with disable option
• Positive Emitter Coupled Logic (PECL), Low Voltage Positive Emitter Coupled Logic (LVPECL) and Current-Mode Logic (CML) compatible data and clock inputs
• Internal common mode voltage available for AC-coupled data and clock inputs and for single-ended applications
• 3.3 V supply voltage
• TZA3047A: AC-coupled laser for 3.3 V laser supply
• TZA3047B: DC-coupled laser for 3.3 V and 5 V laser supply.

Control features
• Dual-loop control for constant and accurate optical average power level and extinction ratio
• Optional average power loop control (up to 1.25 Gbits/s)
• Optional direct setting of modulation and bias currents.

Protection features
• Alarm function on operating current
• Alarm function on monitor current
• Enable function on bias and modulation currents
• Soft start on bias and modulation currents.

APPLICATIONS
• SDH/SONET optical transmission systems