19-0432; Rev 1b; 4/98 Single +5V, Fully Integrated, 155Mbps Laser Diode Driver ____________________________Features ♦ Rise Times Less than 1ns The MAX3263’s fully integrated feature set includes a TTL-compatible laser failure indicator and a programmable slow-start circuit to prevent laser damage. The slow-start is preset to 50ns and can be extended by adding an external capacitor. ♦ Differential PECL Inputs ♦ Single +5V Supply ♦ Automatic Power Control ♦ Temperature-Compensated Reference Voltage ♦ Complementary Enable Inputs _______________Ordering Information PART MAX3263CAG TEMP. RANGE 0°C to +70°C PIN-PACKAGE 24 SSOP ________________________Applications Laser Diode Transmitters _____________Typical Operating Circuit 155Mbps SDH/SONET 155Mbps ATM ___________________Pin Configuration +5V 0.01µF +5V 0.01µF +5V VCCA VCCB TOP VIEW VREF2 1 24 SLWSTRT IPINSET 2 23 IPIN FAILOUT 3 22 VCCA GNDB 4 21 GNDA VIN+ 5 MAX3263 OUT+ VIN+ VIN- PHOTODIODE GNDA GNDB 19 GNDA GNDB 7 18 OUT- VCCB 17 GNDA LASER IPIN MAX3263 ENB+ 20 OUT+ VIN- 6 8 PECL INPUTS FERRITE BEAD IBIASOUT +5V ENB- OUT- SLWSTRT 2.7k FAILOUT IBIASFB ENB- 9 16 IBIASOUT VREF1 ENB+ 10 15 IMODSET VREF1 11 14 IBIASSET VREF2 IBIASSET IMODSET OSADJ IPINSET OSADJ 12 13 IBIASFB SSOP ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX3263 ________________General Description The MAX3263 is a complete, easy-to-program, single +5V-powered, 155Mbps laser diode driver with complementary enable inputs and automatic power control (APC). The MAX3263 accepts differential PECL inputs and provides complementary output currents. A temperature-stabilized reference voltage is provided to simplify laser current programming. This allows modulation current to be programmed up to 30mA and bias current to be programmed from up to 60mA with two external resistors. An APC circuit is provided to maintain constant laser power in transmitters that use a monitor photodiode. Only two external resistors are required to implement the APC function. MAX3263 Single +5V, Fully Integrated, 155Mbps Laser Diode Driver ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) Supply Voltages (VCCA, VCCB).............................-0.3V to +6V VIN+, VIN-, FAILOUT ................................................0V to VCC OUT+, OUT-, IBIASOUT ......................................+1.5V to VCC ENB+, ENB- ......................VCC or +5.5V, whichever is smaller Differential Input Voltage (| VIN+ - VIN- |).........................+3.8V Input Current IBIASOUT ............................................................0mA to 75mA OUT+, OUT- ........................................................0mA to 40mA IBIASSET ........................................................0mA to 1.875mA IMODSET...............................................................0mA to 2mA IPIN, IPINSET, OSADJ...........................................0mA to 2mA FAILOUT..............................................................0mA to 10mA IBIASFB................................................................-2mA to 2mA Output Current VREF1, VREF2.....................................................0mA to 20mA SLWSTRT ..............................................................0mA to 5mA Continuous Power Dissipation (TA = +70°C) SSOP (derate 8mW/°C above +70°C) ..........................640mW Operating Temperature Range...............................0°C to +70°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-55°C to +175°C 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 (VCC = VCCA = VCCB = +4.75V to +5.25V, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) PARAMETER SYMBOL Range of Programmable Laser Bias Current IBIAS Reference Voltage VREF Available Reference Current IREF Supply Current IVCC PECL Input High VIH CONDITIONS TA = +25°C MIN TYP 3.15 3.3 MAX UNITS 60 mA 3.45 V 12 mA (Note 1) 50 VCC - 1.165 PECL Input Low VIL TTL High Input VIH TTL Low Input VIL FAILOUT Output High VOH Loaded with 2.7kΩ pull-up resistor to VCC FAILOUT Output Low VOL Loaded with 2.7kΩ pull-up resistor to VCC mA V VCC - 1.475 2 0.8 V V V 4.5 V 0.5 V Note 1: IVCC = IVCCA + IVCCB, IBIAS = 60mA, IMOD = 30mA, and IPIN = 140µA. AC ELECTRICAL CHARACTERISTICS (VCC = VCCA = VCCB = +4.75V to +5.25V, RLOAD (at OUT+ and OUT-) = 25Ω connected to VCC, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 2) SYMBOL CONDITIONS MAX UNITS Range of Programmable Modulation Current PARAMETER IMOD Minimum differential input swing is 1100mVp-p (Note 3) 30 mA Modulation-Current Rise and Fall Time tR, tF IBIAS = 25mA, IMOD = 12mA, 4ns unit interval; measured from 10% to 90% 1 ns Aberrations, Rising and Falling Edge Modulation-Current PulseWidth Distortion OS PWD MIN IMOD = 12mA, TA = +25°C TYP ±15 IBIAS = 25mA, IMOD = 12mA, 8ns period Note 2: AC characteristics are guaranteed by design and characterization. Note 3: An 1100mVp-p differential is equivalent to complementary 550mVp-p signals on VIN+ and VIN-. 2 _______________________________________________________________________________________ % 100 ps Single +5V, Fully Integrated, 155Mbps Laser Diode Driver RBIASSET vs. BIAS CURRENT RMODSET vs. MODULATION CURRENT DIFFERENTIAL INPUT SWING = 1100 mVp-p 10 100,000 5 4 3 RPINSET (Ω) 8 RMODSET (kΩ) 6 10,000 4 2 1000 2 0 20 100 60 40 0 5 IBIAS (mA) PERCENT CHANGE IN MODULATION CURRENT vs. TEMPERATURE 8 20 30 25 0 1000 500 MODULATION CURRENT (mAp-p) MONITOR CURRENT (µA) PERCENT CHANGE IN BIAS CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE APC DISABLED 6 50 48 4 2 0 -2 -4 -6 SUPPLY CURRENT (mA) % CHANGE (w.r.t. +25°C) 2 1 0 -1 46 44 42 40 38 36 -8 -10 -2 0 20 60 40 80 34 0 TEMPERATURE (°C) 10 20 30 40 50 60 70 80 20 8 6 ALLOWABLE RANGE 2 40 MAXIMUM MODULATION CURRENT (mAp-p) 10 60 40 80 TEMPERATURE (°C) MAXIMUM MODULATION CURRENT vs. MINIMUM DIFFERENTIAL INPUT SIGNAL AMPLITUDE MAX3263-07 12 4 0 TEMPERATURE (°C) ALLOWABLE ROSADJ RANGE vs. MODULATION CURRENT ALLOWABLE ROSADJ (kΩ) % CHANGE (w.r.t. +25°C) 15 3 MAX3263-04 10 10 MAX3263-05 0 MAX3263-06 1 0 MAX3263-08 RBIASSET (kΩ) 6 MAX3263-03 7 RPINSET vs. MONITOR CURRENT 1,000,000 MAX3263-02 12 MAX3263-01 8 RMODSET = 1.2kΩ ROSADJ = 2kΩ 35 30 25 20 15 10 5 0 0 0 5 10 15 20 25 MODULATION CURRENT (mAp-p) 30 0 400 800 1200 1600 2000 MINIMUM DIFFERENTIAL INPUT SIGNAL AMPLITUDE (mVp-p) _______________________________________________________________________________________ 3 MAX3263 __________________________________________Typical Operating Characteristics (MAX3263CAG loads at OUT+ and OUT- = 25Ω, VCC = VCCA = VCCB = +5V, TA = +25°C, unless otherwise noted.) MAX3263 Single +5V, Fully Integrated, 155Mbps Laser Diode Driver ______________________________________________________________Pin Description 4 PIN NAME FUNCTION 1 VREF2 2 IPINSET Monitor Photodiode Programming Input. Connect INPINSET to VREF1 or VREF2 through a resistor to set the monitor current when using automatic power control (see Typical Operating Characteristics). 3 FAILOUT Failout Output. Active-low, open-collector TTL output indicates if automatic power-control loop is out of regulation due to insufficient monitor-diode current (when VPIN is below the 2.6V threshold). Connect FAILOUT to VCC through a 2.7kΩ pull-up resistor. 4, 7 GNDB 5 VIN+ Noninverting PECL Data Input 6 VIN- Inverting PECL Data Input 8 VCCB +5V Supply Voltage for Voltage Reference and Automatic Power-Control Circuitry. Connect VCCB to the same potential as VCCA, but provide separate bypassing for VCCA and VCCB. 9 ENB- Inverting Enable TTL Input. Output currents are enabled only when ENB+ is high and ENB- is low. 10 ENB+ Noninverting Enable TTL Input. Output currents are enabled only when ENB+ is high and ENB- is low. 11 VREF1 Temperature-Compensated Reference Output. VREF1 is internally connected to VREF2. 12 OSADJ Overshoot-Adjust Input. Connect to internal voltage reference through a resistor to adjust the overshoot of the modulation output signal (see Typical Operating Characteristics). 13 IBIASFB Bias-Feedback Current Output. Output from automatic power-control circuit. Connect to IBIASSET when using APC. 14 IBIASSET Laser Bias Current-Programming Input. Connect to internal voltage reference through a resistor to set bias current (see Typical Operating Characteristics). IBIASOUT = 40 x (IBIASSET + IBIASFB). 15 IMODSET Laser Modulation Current-Programming Input. Connect to internal voltage reference through a resistor to set modulation current (see Typical Operating Characteristics). IMOD = 20 x IMODSET. 16 IBIASOUT Laser Bias Current Output. Connect to laser cathode through an R-L filter network (see the Bias Network Compensation section). 17, 19, 21 GNDA Ground for Bias and Modulation Current Drivers 18 OUT- Modulation Output. When VIN+ is high and VIN- is low, OUT- sinks IMOD. 20 OUT+ Modulation Output. When VIN+ is low and VIN- is high, OUT+ sinks IMOD. 22 VCCA +5V Supply Voltage for Bias and Modulation Current Drivers. Connect VCCA to the same potential as VCCB, but provide separate bypassing for VCCA and VCCB. 23 IPIN 24 SLWSTRT Temperature-Compensated Reference Output. VREF2 is internally connected to VREF1. Ground for Voltage Reference and Automatic Power-Control Circuitry Monitor Photodiode Current Input. Connect IPIN to photodiode’s anode. Slow-Start Capacitor Input. Connect capacitor to ground or leave unconnected to set start-up time, tSTARTUP = 25.4kΩ (CSLWSTRT + 2pF). _______________________________________________________________________________________ Single +5V, Fully Integrated, 155Mbps Laser Diode Driver MAX3263 VCC OUT+ MAX3263 VIN+ LASER VINOUT- VCCA PHOTODIODE VCCB 20 x IMODSET IBIASOUT GNDA GNDB +2.6V 40 x IBIASSET ENB+ ENB- BIAS COMPENSATION FAILOUT COMPARATOR MAIN BIAS GENERATOR IPIN LOOPSTABILITY CAPACITOR 0.1µF VCC x 3/5 SLWSTRT TRANSCONDUCTANCE AMPLIFIER IBIASFB IBIASSET IMODSET IOSADJ 1 x IPINSET IPINSET RBIASSET RMODSET RPINSET ROSADJ VREF1, VREF2 BANDGAP REFERENCE Figure 1. Functional Diagram _______________Detailed Description The MAX3263 laser driver has three main sections: a reference generator with temperature compensation, a laser bias block with automatic power control, and a modulation driver (Figure 1). The reference generator provides temperature-compensated biasing and a voltage-reference output. The voltage reference is used to program the current levels of the high-speed modulation driver, laser diode, and PIN (p+, intrinsic, n-) monitor diode. The laser bias block sets the bias current in the laser diode and maintains it above the threshold current. A current-controlled current source (current mirror) programs the bias, with IBIASSET as the input. The mirror’s gain is approximately 40 over the MAX3263’s input range. Keep the output voltage of the bias stage above 2.2V to prevent saturation. The modulation driver consists of a high-speed input buffer and a common-emitter differential output stage. The modulation current mirror sets the laser modulation current in the output stage. This current is switched between the OUT+ and OUT- ports of the laser driver. The modulation current mirror has a gain of approximately 20. Keep the voltages at OUT+ and OUT- above 2.2V to prevent saturation. _______________________________________________________________________________________ 5 MAX3263 Single +5V, Fully Integrated, 155Mbps Laser Diode Driver The overshoot mirror sets the bias in the input buffer stage (Figure 2). Reducing this current slows the input stage and reduces overshoot in the modulation signal. At the same time, the peak-to-peak output swing of the input buffer stage is reduced. Careful design must be used to ensure that the buffer stage can switch the output stage completely into the nonlinear region. The input swing required to completely switch the output stage depends on both ROSADJ and the modulation current. See Allowable ROSADJ Range vs. Modulation Current and Maximum Modulation Current vs. Minimum Differential Input Signal Amplitude graphs in the Typical Operating Characteristics. For the output stage, the width of the linear region is a function of the desired modulation current. Increasing the modulation current increases the linear region. Therefore, increases in the modulation current require larger output levels from the first stage. Failure to ensure that the output stage switches completely results in a loss of modulation current (and extinction ratio). In addition, if the modulation port does not switch completely off, the modulation current will contribute to the bias current, and may complicate module assembly. Automatic Power Control The automatic power control (APC) feature allows an optical transmitter to maintain constant power, despite changes in laser efficiency with temperature or age. The APC requires the use of a monitor photodiode. OUTPUTS VCC MAX3263 280Ω 280Ω INPUTS 2(IOSADJ) 9Ω 400Ω INPUT BUFFER The APC circuit incorporates the laser diode, the monitor photodiode, the pin set current mirror, a transconductance amplifier, the bias set current mirror, and the laser fail comparator (Figure 1). Light produced by the laser diode generates an average current in the monitor photodiode. This current flows into the MAX3263’s IPIN input. The IPINSET current mirror draws current away from the IPIN node. When the current into the IPIN node equals the current drawn away by IPINSET, the node voltage is set by the VCC x 3/5 reference of the transconductance amplifier. When the monitor current exceeds IPINSET, the IPIN node voltage will be forced higher. If the monitor current decreases, the IPIN node voltage is decreased. In either case, the voltage change is amplified by the transconductance amplifier, and results in a feedback current at the IBIASFB node. Under normal APC operation, IBIASFB is summed with IBIASSET, and the laser bias level is adjusted to maintain constant output power. This feedback process continues until the monitor-diode current equals IPINSET. If the monitor-diode current is sufficiently less than IPINSET (i.e., the laser stops functioning), the voltage on the IPIN node drops below 2.6V. This triggers the failout comparator, which provides a TTL signal indicating laser failure. The FAILOUT output asserts only if the monitordiode current is low, not in the reverse situation where the monitor current exceeds IPINSET. FAILOUT is an open-collector output that requires an external pull-up resistor of 2.7kΩ to VCC. The transconductance amplifier can source or sink currents up to approximately 1mA. Since the laser bias generator has a gain of approximately 40, the APC function has a limit of approximately 40mA (up or down) from the initial set point. To take full advantage of this adjustment range, it may be prudent to program the laser bias current slightly higher than required for normal operation. However, do not exceed the IBIASOUT absolute maximum rating of 75mA. To maintain APC loop stability, a 0.1µF bypass capacitor may be required across the photodiode. If the APC function is not used, disconnect the IBIASFB pin. Enable Inputs 9Ω 2(IOSADJ) IMOD The MAX3263 provides complementary enable inputs (ENB+, ENB-). The laser is disabled by reducing the reference voltage outputs (VREF1, VREF2). Only one logic state enables laser operation (Figure 3 and Table 1). OUTPUT STAGE Figure 2. MAX3263 Modulation Driver (Simplified) 6 _______________________________________________________________________________________ Single +5V, Fully Integrated, 155Mbps Laser Diode Driver DATA OUT (LOAD = 1300nm LASER AT OUT-) The MAX3263 data inputs accept PECL input signals, which require 50Ω termination to (VCC - 2V). Figure 4 shows alternative termination techniques. When a termination voltage is not available, use the Theveninequivalent termination. When interfacing with a non-PECL signal source, use one of the other alternative termination methods shown in Figure 4. 2µs/div Figure 3. Enable/Disable Operation Bias Network Compensation Table 1. MAX3263 Truth Table ENB- ENB+ VREF 0 0 Off 0 1 On 1 0 Off 1 1 Off Temperature Considerations The MAX3263 output currents are programmed by current mirrors. These mirrors each have a 2VBE temperature coefficient. The reference voltage (VREF) is adjusted 2VBE so these changes largely cancel, resulting in output currents that are very stable with respect to temperature (see Typical Operating Characteristics). __________________Design Procedure Interfacing Suggestions Use high-frequency design techniques for the board layout of the MAX3263 laser driver. Adding some damping resistance in series with the laser raises the load impedance and helps reduce power consumption (see Reducing Power Consumption section). Minimize any series inductance to the laser, and place a bypass capacitor as close to the laser’s anode as possible. Power connections labeled VCCA are used to supply the laser modulation and laser bias circuits. VCCB connections supply the bias-generator and automatic-power For best laser transmitter performance, add a filter to the circuit. Most laser packages (TO-46 or DIL) have a significant amount of package inductance (4nH to 20nH), which limits their usable data rate. The MAX3263 OUT pin has about 1pF of capacitance. These two parasitic components can cause high-frequency ringing and aberrations on the output signal. If ringing is present on the transmitter output, try adding a shunt RC filter to the laser cathode. This limits the bandwidth of the transmitter to usable levels and reduces ringing dramatically (Figure 5). L = Laser inductance C = Shunt filter capacitance R = Shunt filter resistance A good starting point is R = 25Ω and C = L / 4R. Increase C until aberrations are reduced. The IBIASOUT pin has about 4pF of parasitic capacitance. When operating at bias levels over 50mA, the impedance of the bias output may be low enough to decrease the rise time of the transmitter. If this occurs, the impedance of the IBIASOUT pin can be increased by adding a large inductor in series with the pin. Reducing Power Consumption The laser driver typically consumes 40mA of current for internal functions. Typical load currents, such as 12mA of modulation current and 20mA of bias current, bring the total current requirement to 72mA. If this were dissipated entirely in the laser driver, it would generate 360mW of _______________________________________________________________________________________ 7 MAX3263 ENB+ control circuits. For optimum operation, isolate these supplies from each other by independent bypass filtering. GNDA and GNDB have multiple pins. Connect all pins to optimize the MAX3263’s high-frequency performance. Ground connections between signal lines (VIN+, VIN-, OUT+, OUT-) improve the quality of the signal path by reducing the impedance of the interconnect. Multiple connections, in general, reduce inductance in the signal path and improve the high-speed signal quality. GND pins should be tied to the ground plane with short runs and multiple vias. Avoid ground loops, since they are a source of high-frequency interference. MAX3263 Single +5V, Fully Integrated, 155Mbps Laser Diode Driver 5V PECL SIGNAL SOURCE 5V 82Ω 82Ω VIN+ 120Ω a) THEVENIN-EQUIVALENT TERMINATION MAX3263 VIN120Ω NON-PECL SIGNAL SOURCE VIN+ 5V 50Ω 50Ω 680Ω 50Ω 1.8k b) DIFFERENTIAL NON-PECL TERMINATION MAX3263 50Ω VIN- NON-PECL SIGNAL SOURCE VIN+ 50Ω 180Ω 68Ω 5V c) SINGLE-ENDED NON-PECL TERMINATION MAX3263 5V 680Ω VIN1.8k 5V ECL SIGNAL SOURCE 0V 1.3k 1.3k VIN+ 50Ω d) ECL TERMINATION 3.6k MAX3263 -2V THIS SYMBOL REPRESENTS A TRANSMISSION LINE WITH CHARACTERISTIC IMPEDANCE Zo = 50Ω. VIN50Ω 3.6k -2V Figure 4. Alternative PECL Data-Input Terminations 8 _______________________________________________________________________________________ Single +5V, Fully Integrated, 155Mbps Laser Diode Driver OUT+ ≥0.1µF MAX3263 LASER PHOTODIODE IPIN 10µH 25Ω C SHUNT RC IBIASOUT FERRITE BEAD 0.01µF AS CLOSE TO THE LASER ANODE AS POSSIBLE 18Ω AS CLOSE TO THE LASER CATHODE AS POSSIBLE OUT- Figure 5. Typical Laser Interface with Bias Compensation heat. Fortunately, a substantial portion of this power is dissipated across the laser diode. A typical laser diode drops approximately 1.6V when forward biased. This leaves 3.4V at the MAX3263’s OUT- terminal. It is safe to reduce the output terminal voltage even further with a series damping resistor. Terminal voltage levels down to 2.2V can be used without degrading the laser driver’s high-frequency performance. Power dissipation can be further reduced by adding a series resistor on the laser driver’s OUT+ side. Select the series resistor so the OUT+ terminal voltage does not drop below 2.2V with the maximum modulation current. _____________Applications Information Programming the MAX3263 Laser Driver Programming the MAX3263 is best explained by an example. Assume the following laser diode characteristics: Wavelength λ 1300nm Threshold Current ITH 20mA at +25°C(+0.35mA/ °C temperature variation) Monitor Responsivity ρmon 0.1A/W (monitor current / average optical power into the fiber) Modulation Efficiency η 0.1mW/mA (worst case) Now assume the communications system has the following requirements: PAVE Er Tr 0dBm (1mW) 6dB (Er = 4) 0°C to +70°C 1) Determine the value of IPINSET: The desired monitor-diode current is (PAVE)(ρmon) = (1mW)(0.1A/W) = 100µA. The R PINSET vs. Monitor Current graph in the Typical Operating Characteristics show that RPINSET should be 18kΩ. 2) Determine RMODSET: The average power is defined as (P1 + P0) / 2, where P1 is the average amplitude of a transmitted “one” and P0 is the average amplitude of a transmitted “zero.” The extinction ratio is P1/P0. Combining these equations results in P1 = (2 x PAVE x Er) / (Er + 1) and P0 = (2 x PAVE) / (Er + 1). In this example, P1 = 1.6mW and P0 = 0.4mW. The optical modulation is 1.2mW. The modulation current required to produce this output is 1.2mW / η = (1.2mW) / (0.1mA/mW) = 12mA. The Typical Operating Characteristics show that RMODSET = 3.9kΩ yields the desired modulation current. 3) Determine the value of ROSADJ: Using the Allowable R OSADJ Range vs. Modulation Current graph in the Typical Operating Characteristics, a 5.6kΩ resistor is chosen for 12mA of modulation current. The maximum ROSADJ values given in the graph minimize aberrations in the waveform and ensure that the driver stage operates fully limited. 4) Determine the value of RBIASSET: The automatic power control circuit can adjust the bias current 40mA from the initial setpoint. This feature makes the laser driver circuit reasonably insensitive to variations of laser threshold from lot to lot. The bias setting can be determined using one of two methods: A) Set the bias at the laser threshold. B) Set the bias at the midpoint of the highest and lowest expected threshold values. Method A is straightforward. In the second method, it is assumed that the laser threshold will increase with age. The lowest threshold current occurs at 0°C when the laser is new. The highest threshold current occurs at +70°C at the end of the product’s life. Assume the laser is near the end of life when its threshold reaches twotimes its original value. Lowest Bias Current: ITH + ∆ITH = 20mA + (0.35mA/°C)(-25°C) = 11.25mA Highest Bias Current: 2 x ITH + ∆ITH = 40mA + (0.35mA/°C)(+45°C) = 55.8mA _______________________________________________________________________________________ 9 MAX3263 18Ω Average Power Extinction Ratio Temperature Range +5V In this case, set the initial bias value to 34mA (which is the midpoint of the two extremes). The 40mA adjustment range of the MAX3263 maintains the average laser power at either extreme. The Typical Operating Characteristics show that RBIASSET = 1.8kΩ delivers the required bias current. Laser Safety and IEC 825 must determine the level of fault tolerance required by their application, recognizing that Maxim products are not designed or authorized for use as components in systems intended for surgical implant into the body, for applications intended to support or sustain life, or for any other application where the failure of a Maxim product could create a situation where personal injury or death may occur. Using the MAX3263 laser driver alone does not ensure that a transmitter design is compliant with IEC 825 safety requirements. The entire transmitter circuit and component selections must be considered. Each customer ______________________________________________________________________Package Information SSOP.EPS MAX3263 Single +5V, Fully Integrated, 155Mbps Laser Diode Driver 10 ______________________________________________________________________________________ Single +5V, Fully Integrated, 155Mbps Laser Diode Driver MAX3263 NOTES ______________________________________________________________________________________ 11 MAX3263 Single +5V, Fully Integrated, 155Mbps Laser Diode Driver NOTES Maxim makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Maxim assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “typicals” must be validated for each customer application by customer’s technical experts. Maxim products are not designed, intended or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Maxim product could create a situation where personal injury of death may occur. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.