MAX3766 19-1249 Rev 1 11/04 622Mbps LAN/WAN Laser Driver with Automatic Power Control and Safety Shutdown General Description Features The MAX3766 is a complete, easy-to-program laser 60mA Modulation Current driver for fiber optic LAN transmitters, optimized for 80mA Bias Current operation at 622Mbps. It includes a laser modulator, automatic power control (APC), and a failure indicator 200ps Edge Speed with latched shutdown. Modulation-Current Temperature Compensation Laser modulation current can be programmed up to 60mA at 622Mbps. A programmable modulation tem- Automatic Power Control perature coefficient can be used to keep the transmit- Laser-Fail Indicator with Latched Shutdown ted extinction ratio nearly constant over a wide temperature range. The modulator operates at data Smooth Laser Start-Up rates up to 1.25Gbps at reduced modulation current. APC circuitry uses feedback from the lasers monitor photodiode to adjust the laser bias current, producing constant output power regardless of laser temperature Ordering Information or age. The MAX3766 supports laser bias currents up PART TEMP RANGE PIN-PACKAGE to 80mA. MAX3766EEP -40C to +85C 20 QSOP The MAX3766 provides extensive laser safety features, including a failure indicator with latched shutdown and MAX3766EEP+ -40C to +85C 20 QSOP a smooth start-up bias generator. These features help MAX3766E/D -40C to +85C Dice* ensure that the transmitter output does not reach haz- ardous levels. The MAX3766 is available in a compact *Dice are designed to operate over this range, but are tested and 20-pin QSOP and dice. guaranteed at T = +25C only. Contact factory for availability. A +Denotes lead-free package. Applications 622Mbps ATM Transmitters 1.25Gbps Fiber Optic LAN Transmitters Pin Configuration 1.25Gbps Ethernet Transmitters TOP VIEW BIASMAX 1 20 REF1 TC 2 19 POWERSET REF2 3 18 MD MOD 4 17 GNDOUT Typical Application Circuits appear at end of data sheet. MAX3766 GND 5 16 BIAS IN- 6 15 OUT+ IN+ 7 14 OUT- GND 8 13 V CCOUT V 9 12 FAIL CC ENABLE 10 11 SAFETY QSOP Maxim Integrated Products 1 For free samples & the latest literature: 622Mbps LAN/WAN Laser Driver with Automatic Power Control and Safety Shutdown ABSOLUTE MAXIMUM RATINGS Supply Voltage, V , V OUT.................................-0.5V to 7.0V Current into FAIL ...................................................-5mA to 30mA CC CC Voltage at IN+, IN-, ENABLE, Current into SAFETY..............................................-5mA to 10mA SAFETY, FAIL ...........................................-0.5V to (V + 0.5V) Continuous Power Dissipation (T = +85C) CC A Voltage at MOD, BIASMAX, POWERSET, TC..........-0.5V to 4.0V QSOP (derate 9.1mW/C above +85C).......................590mW Current out of REF1, REF2 .................................-0.1mA to 10mA Operating Junction Temperature Range...........-40C to +150C Current into OUT+, OUT- ....................................-5mA to 100mA Processing Temperature (dice) .......................................+400C Current into BIAS.................................................-5mA to 130mA Storage Temperature Range .............................-55C to +150C Current into MD .......................................................-5mA to 5mA Lead Temperature (soldering, 10sec) .............................+300C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS RECOMMENDED OPERATING CONDITIONS Supply Voltage, V 4.5 5.0 5.5 V CC Ambient Operating Temperature (Note 1) -40 25 85 C V - V , common-mode input = IN+ IN- Differential Input Signal Amplitude 500 1000 1800 mV V - 1.3V, Figure 1 CC Input Common-Mode Voltage Referenced to V -1.4 -1.3 -1.19 V CC Enable Input High 2.0 V Enable Input Low 0.8 V Voltage at OUT+, OUT- V - 2.5 V CC Voltage at BIAS V - 2.5 V CC FAIL Load All DC testing uses 5.1k load 2.7 to 20 k Data Rate DC to 1.25 Gbps Data Duty Cycle While using APC 50 % Laser to PIN Coupling Not tested 0.001 to 0.1 mA/mA DC PARAMETERS Supply Current I (Note 2) 21 25 32 mA CC FAIL Output High R = 5.1k 4.3 V FAIL FAIL Output Low I > 15A, R = 5.1k 0.33 0.44 V MD FAIL Bias-Current Range (Note 3) 0.5 80 mA Bias Current when Driver is 0.1 10 A Disabled or Shut Down Modulation-Current Programmable Input data high (Note 3) 260 mA Range Modulation Current Input data low (Note 2) 1 200 A Modulation Current when Driver is 10 A Disabled or Shut Down Minimum Modulation-Current R = 0 -50 ppm/C TC Temperature Compensation Maximum Modulation-Current R = open 5600 ppm/C TC Temperature Compensation 2 MAX3766