MAX3668 19-4799 Rev 4 2/05 +3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Control General Description Features The MAX3668 is a complete, +3.3V laser driver with Single +3.3V or +5.0V Operation automatic power control (APC) circuitry for SDH/SONET 38mA Supply Current at +3.3V applications up to 622Mbps. It accepts differential PECL inputs, provides bias and modulation currents, Programmable Modulation Current from and operates over a temperature range of -40C to 5mA to 75mA +85C. Programmable Bias Current from 1mA to 80mA An APC feedback loop is incorporated to maintain a constant average optical power over temperature and Rise/Fall Time <200ps lifetime. The wide modulation current range of 5mA to Automatic Average Power Control with Failure 75mA and bias current of 1mA to 80mA are easy to Monitor program, making this product ideal for use in various SDH/SONET applications. Complies with ANSI, ITU, and Bellcore The MAX3668 also provides enable control and a failure- SONET/SDH Specifications monitor output to indicate when the APC loop is unable Enable Control to maintain the average optical power. The MAX3668 is Ordering Information available in a 5mm 32-pin TQFP package as well as in dice. PART TEMP RANGE PIN-PACKAGE MAX3668EHJ -40C to +85C 32 TQFP (5mm x 5mm) Applications MAX3668EHJ+ -40C to +85C 32 TQFP (5mm x 5mm) 622Mbps SDH/SONET Access Nodes MAX3668E/D Note Dice* Laser Driver Transmitters Note: Dice are designed to operate over a -40C to +140C junction temperature (Tj) range, but are tested and guaranteed Section Regenerators at T = +25C. A *Contact factory for availability. +Denotes lead-free package. Pin Configuration appears at end of data sheet. Typical Operating Circuit +3.3V +3.3V LASER V CC R- 130 130 R+ 6.3 20 DATA+ R D OUT- 5 MAX3693 PECL DATA- OUT+ C D 4:1 MAX3668 R FILT 1.0F SERIALIZER 82 82 20 WITH C FILT CLOCK GEN 5pF BIAS FERRITE BEAD MD C MD 1000pF 0.1F C0 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. BIASMAX ENABLE MODSET APCSET CAPC FAIL GND+3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Control ABSOLUTE MAXIMUM RATINGS Supply Voltage, V .............................................-0.5V to +7.0V Voltage at BIAS .........................................+1.0V to (V + 0.5V) CC CC Current into BIAS ............................................-20mA to +150mA Continuous Power Dissipation (T = +85C) A Current into OUT+, OUT-............................... -20mA to +100mA 32-Pin TQFP (derate 14.3mW/C above +85C)........ 929mW Current into MD....................................................-5mA to +5mA Operating Junction Temperature Range...........-55C to +150C Voltage at DATA+, DATA-, ENABLE, Processing Temperature (Die).........................................+400C FAIL .......................................................-0.5V to (V + 0.5V) Storage Temperature Range ........................... -65C to +165C CC Voltage at OUT+, OUT-.............................+1.5V to (V + 1.5V) Lead Temperature (soldering, 10s) ................................+300C CC Voltage at MODSET, APCSET, BIASMAX, CAPC............................................................... -0.5V to +3.0V 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. DC ELECTRICAL CHARACTERISTICS (V = +3.14V to +5.5V, T = -40C to +85C, unless otherwise noted. Typical values are at V = +3.3V, T = +25C.) (Note 1) CC A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current (Note 2) 38 60 mA Bias Current Range I V = V - 1.6V 180 mA BIAS BIAS CC Bias Off Current ENABLE = low (Note 3) 100 A I = 80mA 390 BIAS Bias Current Stability APC open loop ppm/C I = 1mA 920 BIAS Bias Current Absolute Accuracy APC open loop -15 15 % Differential Input Voltage V Figure 1 200 1600 mVp-p ID V -V -V - CC CC CC Common-Mode Input Voltage V PECL compatible V ICM 1.49 1.32 V /4 ID DATA+, DATA- Input Current I -1 10 A IN I = 1mA -480 10 480 MD Monitor Diode Current Stability (Note 4) ppm/C I = 18A (Note 5) 70 MD Monitor Diode Current -15 15 % Absolute Accuracy DC Monitor Diode Current I 18 1000 A MD Monitor Diode Input Voltage V 0.8 V MD (MD Pin) TTL Input High Voltage V 2.0 V IH TTL Input Low Voltage V 0.8 V IL TTL Output High Voltage V Sourcing 50A 2.4 V - 0.3 V V OH CC CC (FAIL) TTL Output Low Voltage V Sinking 100A 0.1 0.44 V OL (FAIL) 2 MAX3668