MAX3996 19-2194 Rev 3 5/04 3.0V to 5.5V, 2.5Gbps VCSEL and Laser Driver General Description Features The MAX3996 is a high-speed laser driver for small- 9ps Deterministic Jitter P-P form-factor (SFF) fiber optic LAN transmitters. It con- 20-Pin QFN 4mm 4mm Package tains a bias generator, a laser modulator, and comprehensive safety features. Automatic power con- 3.0V to 5.5V Supply Voltage trol (APC) adjusts the laser bias current to maintain Automatic Power Control average optical power, regardless of changes in tem- perature or laser properties. The driver accommodates Integrated Safety Circuits common anode or differential laser configurations. The 30mA Laser Modulation Current output current range of the MAX3996 is appropriate for VCSELs and high-efficiency edge-emitting lasers. Temperature Compensation of Modulation The MAX3996 operates up to 3.2Gbps. It can switch up Current to 30mA of laser modulation current and sink up to Compliant with SFF and SFP MSA 60mA bias current. Adjustable temperature compensa- tion is provided to keep the optical extinction ratio with- in specifications over the operating temperature range. The MAX3996 accommodates various laser packages, including low-cost TO-46 headers. Low deterministic jit- Ordering Information ter (9ps ), combined with fast edge transitions, P-P (65ps) provides excellent margins compared to indus- TEMP PIN- PACKAGE try-standard transmitter eye masks. PART RANGE PACKAGE CODE This laser driver provides extensive safety features to MAX3996CGP 0C to +70C 20 QFN G2044-3 guarantee single-point fault tolerance. Safety features include a transmit disable, redundant shutdown, and MAX3996CTP+ 0C to +70C 20 Thin QFN T2044-3 laser-bias monitoring. The safety circuit detects faults + Denotes Lead-Free Package that could cause hazardous light levels and immediate- ly disables the laser output. The MAX3996 safety cir- cuits are compliant with SFF and small-form-factor Typical Application Circuit pluggable (SFP) multisource agreements (MSA). The MAX3996 is available in a compact 4mm 4mm, V CC 20-pin QFN package and a 20-pin thin QFN package. It OPTIONAL SHUTDOWN operates over a temperature range of 0C to +70C. CIRCUITRY V CC 1.8k Applications Fibre Channel Optical Transmitters 0.01 F V CC SHDNDRV TX DISABLE VCSEL Transmitters 0.01 F Gigabit Ethernet Optical Transmitters FAULT OUT- ATM LAN Optical Transmitters 0.01 F 0.01 F 10 Gigabit Ethernet WWDM IN+ OUT+ MAX3996 L1* 0.01 F 25 IN- BIAS PORDLY Pin Configuration appears at end of data sheet. MD TC MODSET MON1 MON2 COMP GND C PORDLY R SET N.C. R R TC MOD C COMP *FERRITE BEAD 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.3.0V to 5.5V, 2.5Gbps VCSEL and Laser Driver ABSOLUTE MAXIMUM RATINGS Supply Voltage at V ...........................................-0.5V to +7.0V Current into FAULT, SHDNDRV ..........................-1mA to +25mA CC Voltage at TX DISABLE, PORDLY, MON1, COMP, Current into OUT+, OUT-....................................................60mA IN+, IN-, MD, BIAS, MODSET, TC..........-0.5V to (V + 0.5V) Current into BIAS ..............................................................120mA CC Voltage between COMP and MON2 .....................................2.3V Continuous Power Dissipation (T = +70C) A Voltage between IN+ and IN- ..................................................5V 20-Pin QFN (derate 20mW/C)...................................1600mW Voltage at OUT+, OUT-.........................(V - 2V) to (V + 2V) Operating Ambient Temperature Range .............-40C to +85C CC CC Voltage between MON1 and MON2 .....................................1.5V Operating Junction Temperature Range...........-40C to +150C Voltage between BIAS and MON2...........................................4V Storage Temperature Range...........................-55C to +150C 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, TC pin not connected, T = CC A CC A +25C.) (Figure 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V = 3.3V, I = 15mA 47 CC MOD I CC Supply Current (Figure1) mA V = 5.5V, I = 30mA, CC MOD 52 75 (Note 1) R = 2.37k MODSET Data Input Voltage Swing V Total differential signal (Figure 2) 200 2200 mV ID P-P TX DISABLE Input Current 0 < V < V -100 +100 A PIN CC TX DISABLE Input High Voltage V 2.0 V IH TX DISABLE Input Low Voltage V 0.8 V IL FAULT Output High Voltage V I = -100A, 4.7k < R < 10k 2.4 V OH OH FAULT FAULT Output Low Voltage V I = 1mA 0.4 V OL OL BIAS GENERATOR Minimum Bias Current I Current into BIAS pin 1 mA BIAS Maximum Bias Current I Current into BIAS pin 60 mA BIAS APC loop is closed 1.04 1.12 MD Quiescent Voltage V FAULT = high V - 0.73 V MD CC TX DISABLE = high V - 0.73 CC Monitor Resistance R (Figure 4) 9.3 11 12.7 MON MD Input Current FAULT = low, TX DISABLE = low -3 +0.8 +3 A BIAS Current During Fault I 10 A BIAS OFF APC Time Constant C = 0.1F 35 s COMP POWER-ON RESET (POR) POR Threshold Measured at V 2.65 2.7 3.0 V CC PORDLY = open (Note 3) 30 55 s POR Delay t PORDLY C = 0.001F (Note 3) 1.7 2.4 ms PORDLY POR Hysteresis 20 mV SHUTDOWN I = 10A, FAULT = high V - 0.4 SHDNDRV CC Voltage at SHDNDRV I = 1mA, FAULT = low V - 2.4 V SHDNDRV CC I = 15mA, FAULT = low 0 V - 1.2 SHDNDRV CC LASER MODULATOR Data Rate < 3.2 Gbps 2 MAX3996