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M02067G-13 Fiches technique(PDF) 10 Page - M/A-COM Technology Solutions, Inc. |
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M02067G-13 Fiches technique(HTML) 10 Page - M/A-COM Technology Solutions, Inc. |
10 / 20 page M02067 -12/-13 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support 10 3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps Rev V4 3.2 Features • Rise and fall times <150 ps • DC or AC-coupled modulation drive • Independently programmable laser bias and modulation currents • Bias current to 100 mA and modulation current to 85 mA at VCC = 3.3V • Automatic laser power control, with programmable temperature compensation and ‘Slow-Start’ • Bias and modulation current monitors • Operates with +3.3V supply 3.3 Modulator The modulator output stage is designed to drive up to 85 mA in either AC-coupled or DC-coupled mode. DC- coupled performance depends on the laser used. The M02067 modulation output is optimized for driving a 25 Ω load; the minimum required voltage at OUT+ and OUT- is 0.6V. To interface with the laser diode, a matching resistor (RD) is required for impedance matching. An RC shunt network is necessary to compensate for the laser diode parasitic inductance, thereby improving the optical eye. Typical values are RSHUNT = 51Ω, CSHUNT = 3.3 pF Any capacitive loading at the cathode of a laser diode will degrade the optical output performance. An inductor is used to isolate the BIAS pin from the laser cathode. Figure 3-2 shows the typical IMOD vs RMODSET characteristic. Figure 3-2. Modulation Current for Given RMODSET Resistor 0 20 40 60 80 100 120 0 4000 8000 12000 16000 20000 24000 28000 32000 RMODSET (Ω) |
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