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MAX3865 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX3865 Datasheet(HTML) 1 Page - Maxim Integrated Products |
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General Description The MAX3865 is designed for direct modulation of laser diodes at data rates up to 2.5Gbps. It incorporates two feedback loops, the automatic power-control (APC) loop and the automatic modulation-control (AMC) loop, to maintain constant average optical output and extinc- tion ratio over temperature and laser lifetime. External resistors or current output DACs may set the laser out- put levels. The driver can deliver up to100mA of laser bias current and up to 60mA laser modulation current with a typical (20% to 80%) edge speed of 84ps. The MAX3865 accepts differential clock and data input signals with on-chip 50 Ω termination resistors. The inputs can be configured for CML or other high-speed logic. An input data-retiming latch can be enabled to reject input pattern-dependent jitter when a clock signal is available. The MAX3865 provides laser bias current and modulation current monitors, as well as a failure detector, to indicate the laser operating status. These features are all imple- mented on an 81mil ✕ 103mil die; the MAX3865 is also available as a 32-pin QFN package. Applications SONET/SDH Transmission Systems Add/Drop Multiplexers Digital Cross-Connects Section Regenerators 2.5Gbps Optical Transmitters Features o Single +3.3V or +5V Power Supply o 68mA Supply Current o Up to 2.5Gbps (NRZ) Operation o Feedback Control for Constant Average Power o Feedback Control for Constant Extinction Ratio o Programmable Bias Current Up to 100mA o Programmable Modulation Current Up to 60mA o 84ps Rise/Fall Time o Selectable Data Retiming Latch o Bias and Modulation Current Monitors o Failure Detector o ESD Protection 2.5Gbps Laser Driver with Automatic Modulation Control ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-2247; Rev 1; 4/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Pin Configuration appears at end of data sheet. PART TEMP. RANGE PIN-PACKAGE MAX3865EGJ -40°C to +85°C 32 QFN MAX3865E/D -40°C to +85°C Dice* †Covered by U.S. Patent numbers 5,883,910, 5,850,409, and other patent pending. *Dice are designed to operate from -40°C to +85°C , but are tested and guaranteed at TA = +25°C only. Contact factory for availability. MAX3865 MAX3892 50 Ω DATA- DATA- 50 Ω DATA+ DATA+ VDR VCR 50 Ω CLK+ CLK+ 50 Ω CLK- CLK- 2.5Gbps SERIALIZER +3.3V +3.3V 200 Ω 200 Ω +3.3V LED RMODMAX RBIASMAX RAPCSET RAMCSET 20 Ω +3.3V 20 Ω 20 Ω 0.056 µF 0.056 µF 15 Ω LASER MODN MODQ BIAS BIAS_X MD MD_X REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE LP LP Typical Applications Circuit |
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