MAX3286MAX3289/MAX3296MAX3299 19-1550 Rev 6 11/04 to 3.0V 5.5V, 1.25Gbps/2.5Gbps LAN Laser Drivers General Description Features 7ps Deterministic Jitter (MAX3296) The MAX3286/MAX3296 series of products are high- 22ps Deterministic Jitter (MAX3286) speed laser drivers for fiber optic LAN transmitters opti- mized for Gigabit Ethernet applications. Each device +3.0V to +5.5V Supply Voltage contains a bias generator, laser modulator, and com- Selectable Laser Pinning (Common Cathode or prehensive safety features. Automatic power control Common Anode) (MAX3286/MAX3296) (APC) adjusts the laser bias current to maintain aver- 30mA Laser Modulation Current age optical power at a constant level, regardless of Temperature Compensation of Modulation Current changes in temperature or laser properties. For lasers Automatic Laser Power Control or Constant without a monitor photodiode, these products offer a Bias Current constant-current mode. The circuit can be configured for use with conventional shortwave (780nm to 850nm) Integrated Safety Circuits or longwave (1300nm) laser diodes, as well as vertical- Power-On Reset Signal cavity surface-emitting lasers (VCSELs). QFN and Thin QFN Packages Available The MAX3286 series (MAX3286MAX3289) is opti- Ordering Information mized for operation at 1.25Gbps, and the MAX3296 series (MAX3296MAX3299) is optimized for 2.5Gbps PART TEMP RANGE PIN-PACKAGE operation. Each device can switch 30mA of laser mod- 28 Thin QFN ulation current at the specified data rate. Adjustable MAX3286CTI+ 0C to +70C (5mm x 5mm)**** temperature compensation is provided to keep the opti- cal extinction ratio within specifications over the operat- 28 QFN MAX3286CGI 0C to +70C ing temperature range. This series of devices is (5mm x 5mm)*** optimized to drive lasers packaged in low-cost TO-46 32 TQFP headers. Deterministic jitter (DJ) for the MAX3286 is MAX3286CHJ 0C to +70C (5mm x 5mm) typically 22ps, allowing a 72% margin to Gigabit Ethernet DJ specifications. Ordering Information continued at end of data sheet. *Dice are designed to operate from T = 0C to +110C, but These laser drivers provide extensive safety features to J are tested and guaranteed only at T = +25C. A guarantee single-point fault tolerance. Safety features **Exposed pad. include dual enable inputs, dual shutdown circuits, and ***Package Code: G2855-1 a laser-power monitor. The safety circuit detects faults ****Package Code: T2855-7 that could cause dangerous light output levels. A pro- +Denotes Lead-Free Package. grammable power-on reset pulse initializes the laser driver at startup. Pin Configurations The MAX3286/MAX3296 are available in a compact, 5mm TOP VIEW 5mm, 28-pin QFN or thin QFN package a 5mm 5mm, 32-pin TQFP package or in die form. The MAX3287/ MAX3288/MAX3289 and MAX3297/MAX3298/MAX3299 are available in a 16-pin TSSOP-EP package. + FAULT 1 21 BIASDRV Applications FAULT 2 20 SHDNDRV Gigabit Ethernet Optical Transmitter POR 3 19 GND MAX3286 GND 4 18 MON Fibre Channel Optical Transmitter MAX3296 EN 5 17 MD ATM LAN Optical Transmitter EN 6 16 POL PORDLY 7 15 POL Typical Application Circuits and Selector Guide appear at end of data sheet. THIN QFN* *Exposed pad is connected to GND. Pin Configurations continued at end of data sheet. 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. FLTDLY 8 28 TC LV 9 27 MODSET V 10 26 V CC CC IN+ 11 25 OUT- IN- 12 24 OUT+ GND 13 23 V CC REF 14 22 V CC3.0V to 5.5V, 1.25Gbps/2.5Gbps LAN Laser Drivers ABSOLUTE MAXIMUM RATINGS Supply Voltage at V ..........................................-0.5V to +7.0V 28-Pin QFN and 28-Pin Thin QFN CC Voltage at EN, EN, PORDLY, FLTDLY, LV, IN+, IN-, (derate 28.7mW/C above +70C)..............................2300mW REF, POL, POL, MD, MON, BIASDRV, 16-Pin TSSOP (derate 27mW/C above +70C) .........2162mW MODSET, TC.......................................................-0.5V to (V + 0.5V) Operating Temperature Range...............................0C to +70C CC Voltage at OUT+, OUT-.........................(V - 2V) to (V + 2V) Operating Junction Temperature Range ..............0C to +150C CC CC Current into FAULT, FAULT, POR, SHDNDRV....-1mA to +25mA Processing Temperature (die) .........................................+400C Current into OUT+, OUT-....................................................60mA Storage Temperature Range .............................-55C to +150C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 32-Pin TQFP (derate 14.3mW/C above +70C).........1100mW 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 (V = +3.0V to +5.5V, T = 0C to +70C, unless otherwise noted. Typical values are at V = +3.3V, R = open and T = +25C CC A CC TC A see Figure 1a.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current I Figure 1a, R = 1.82k 52 75 mA CC MOD Data Input Voltage Swing V Total differential signal, peak-to-peak, Figure 1a 200 1660 mV ID TTL Input Current 0 V V -100 +100 A PIN CC TTL Input High Voltage V 2 V IH TTL Input Low Voltage V 0.8 V IL FAULT, FAULT Output High V I = -100A 2.4 V OH OH Voltage FAULT, FAULT Output Low V I = 1mA 0.4 V OL OL Voltage BIAS GENERATOR (Note 1) BIASDRV Current, Shutdown EN = GND -1 +1 A BIASDRV Current Sink FAULT = low, V 0.6V 0.8 mA BIASDRV BIASDRV Current Source FAULT = low, V V - 1V 0.8 mA BIASDRV CC REF Voltage I 2mA, MON = V 2.45 2.65 2.85 V REF CC MD Nominal Voltage V APC loop is closed 1.55 1.7 1.85 V MD Common-cathode configuration 0.4 1.2 MD Voltage During Fault V Common-anode configuration 2V - 0.8 CC MD Input Current Normal operation (FAULT = low) -2 +0.16 +2 A MON Input Current V = V 0.44 6 A MON CC POWER-ON RESET LV = GND 3.9 4.5 POR Threshold V LV = open 2.65 3.00 POR Hysteresis 150 mV FAULT DETECTION REF Fault Threshold 2.95 V MD High Fault Threshold V + 5% V + 20% MD MD MD Low Fault Threshold V - 20% V - 5% MD MD V- V CC CC - MON Fault Threshold MAX3286/MAX3288/MAX3296/MAX3298 mV 600 480 MODSET, TC Fault Threshold 0.9 V 2 MAX3286MAX3289/MAX3296MAX3299