M02067 3.3 Volt Laser Driver IC for GbE and Fibre Channel to 2.1 Gbps The M02067 is a highly integrated, programmable laser driver intended for datacom applications up to 2.1 Gbps. Using differential PECL data inputs, the M02067 supplies the bias and modulation current for driving an edgeemitting laser. The modulation output can be DC-coupled to the laser diode, giving a significant power saving over AC-coupled operation. The M02067 includes automatic power control to maintain a constant average laser output power over temperature and life. In addition, the modulation current is temperature compensated to minimize variation in extinction ratio over temperature. Output flags indicate laser end of life as well as failure of the APC circuitry to maintain average output power. Features Applications * * * * * * * * Rise and fall times <150 ps DC or AC-coupled modulation drive Independently programmable laser bias and modulation currents Bias current to 100 mA and modulation current to 85 mA at VCC = 3.3V * Automatic laser power control, with programmable temperature compensation and `slow-start' * Bias and modulation current monitors * Operates with +3.3V supply Gigabit Ethernet Fibre Channel 2 x Fibre Channel GBIC Functional Block Diagram VCC OUTOUT+ RD RSHUNT CSHUNT VCC DATA GNDA X100 DIS ENA BIASMON X1 55 MODMON IBIAS X60 IBIAS PD IMOD Failure Detect 55 FAIL RMPCSET OCA SET OCA ROCA RTCSTART RMODSET 02067-DSH-001-G RTCSLOPE VREF CMPC VCC Mindspeed Technologies(R) Mindspeed Proprietary and Confidential July 2011 Ordering Information Part Number Package M02067G-12 QFN package (-12 marking) M02067G-13 QFN package (-12* marking) M02067-TEVM TO-Can optical evaluation board M02067-E-EVM Electrical evaluation board Current part number ordering information for this part on mindspeed.com * The letter "G" designator after the part number indicates that the device is RoHS-compliant. Refer to www.mindspeed.com for additional information. Revision History Revision Level Date Description G Release July 2011 F Release January 2011 E Release November 2010 D Preliminary October 2007 C Preliminary June 2006 Added RoHS package information, updated format, no specification changes. B Preliminary May 2005 Updated to new data sheet format. A Advance October 2003 Added M02067G-13 ordering information and screen limit. Revised RMODSET value in Table 1-3, Note 4. Revised production test conditions in Table 1-5. Updated ordering information, packaging information. Added DC screen information. Replaced all CX02067 references with M02067. Updated ordering information. Advance. M02067-12 and M02067-13 Marking Diagrams 02067-DSH-001-G M02067 G-12 M02067 G-13 - 12 02067 G XXXXX YYWW CC - 12 02067 G XXXXX YYWW CC Mindspeed Technologies(R) Mindspeed Proprietary and Confidential Part Number Lot Number Date and Country Code ii ENA 24 23 21 VCC DIN DIN 22 20 19 OCA SET DIS 2 18 BIASMON 3 17 TCSTART MODMON 4 16 TCSLOPE FAIL 5 15 GND OCA 6 14 CMPC 10 11 12 13 MODSET PD GNDA 9 OUT- 8 OUT+ 7 VCC GND 2067 BIAS 4mm 1 VCC GND Top View Pin Configuration (See Figure 4-1 for detailed drawing) 4mm 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential iii 1.0 Product Specification 1.1 Absolute Maximum Ratings These are the absolute maximum ratings at or beyond which the IC can be expected to fail or be damaged. Reliable operation at these extremes for any length of time is not implied. Table 1-1. Absolute Maximum Ratings Parameter Rating Units -0.5 to +6.0 V Maximum laser bias current 120 mA Maximum laser modulation current (through OUT+, OUT-) 100 mA Storage temperature -65 to +150 C Junction temperature (die) -40 to +120 C Power supply (VCC-GND) 1.2 Table 1-2. Recommended Operating Conditions Recommended Operating Conditions Parameter Rating Units Power supply (VCC-GND) 3.3 10% V Operating ambient temperature -40 to +85 C 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 1 Product Specification 1.3 DC Characteristics Table 1-3. DC Characteristics Parameter Conditions Min Typ Max Units Supply current Excluding IBIAS and IMOD but with IBIAS and IMOD set to maximum - 52 64 mA Bias current adjust range Limited by IREF across temperature range 4 - 100 mA Bias current with output disabled Tx-Dis = HIGH - - 300 A Maximum bias current limit TA = +85 C (adjustable) 100(1) - - mA Monitor diode reverse bias voltage 2 - - V Monitor diode current adjustment range 40 - 1000 A TTL/CMOS input HIGH voltage (enable/ disable) 2.0 - - V TTL/CMOS input LOW voltage (enable/ disable) - - 0.8 V CMOS output HIGH voltage (Fail,OCA) 2.4 - - V CMOS output LOW voltage (Fail,OCA) - - 0.4 V 2.5 - - k VCC -1.38 - VCC - VIN(Diff) 4 V VCC -1.38 - VCC -0.47 V 1 ms 1 s 300 A Differential input impedance Data and clock inputs Common-mode input voltage` Self-biased common mode input voltage Data and clock inputs Ratio of bias monitoring current, and bias current 55 Ratio of modulation monitoring current, and modulation current 55 Tx_Disable negate time (2) Tx_Disable assert time (3) Modulation Off Current (4) CMPC = 3.8 nF Measured at pin OUT-, temperature at 75 C .5 VCC = +3.3V 10%, TA = -40 C to +85 C, unless otherwise noted Notes: (1)Condition when pin 19 OCASET is connected to ground. (2)Time for optical power to reach 90% of its mean level following negation of Tx_Disable. (3)Time for optical power to reach 10% of its mean level following assertion of Tx_Disable. (4)Data input voltage (Vpin21 - Vpin22) > 300 mV, ENA (pin 1) connected to VCC, DIS (pin 2) connected to ground. RMODSET = 5.5 k, resistance to ground at GNDA = 0.35 . 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 2 Product Specification 1.4 AC Characteristics Table 1-4. AC Characteristics Parameter Conditions Differential input voltage = 2 x (DIN+HIGH-DIN+LOW) Modulation current range Min. Typ. Max. Units. 300 - 1860 mV 2.5 - 85 mA Modulation current with output disabled DIS = HIGH - - 300 A Programmable range for modulation current temperature coefficient Adjustable 500 - 104 ppm/C Programmable temperature at which modulation current TC compensation enables Programmed by choice of RTCSLOPE 20 - 60 C Modulation output rise/fall times 20% to 80% into 25, with matching network - - 150 ps Overshoot of modulation output current Into 25 load, with matching network -5 - +5 % Modulation output Pulse width distortion Measured using alternating 1-0 pattern - - 50 ps Peak-to-peak. Measured into 25 load using 27PRBS at 2.1 Gbps - - 50 ps Modulation output deterministic jitter 1 Notes: VCC = +3.3V 10%, TA = -40 C to +85 C, unless otherwise noted 1.5 DC Screen The M02067 is screened under the following conditions. TA = 25 C, VCC = 3.3 V, RMODSET = 8.46 k Table 1-5. DC Screen Part Number Parameter Production Test Conditions Screen Limits M02067G-12 Modulation Current Measured at pin OUTLoad resistor at OUT- is 24 connected to VCC 41.8 mA min. to 50.8 mA max M02067G-13 Modulation Current Measured at pin OUTLoad resistor at OUT- is 24 connected to VCC 41.8 mA min. to 48.0 mA max 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 3 2.0 Pin Description 2.1 Table 2-1. Pin Descriptions Pin Descriptions Pin Number Pin Name 1 ENA Bias and modulation output enable (TTL/CMOS). Logic HIGH for normal operation. 2 DIS Bias and modulation output disable (TTL/CMOS). Logic LOW for normal operation. 3 BIASMON Bias monitor. Connect a resistor between this pin and VCC to monitor bias current. Connect to VCC if not used. 4 MODMON Modulation monitor. Connect a resistor between this pin and VCC to monitor modulation current. Connect to VCC if not used. 5 FAIL Mean power control failure indicator (TTL/CMOS). Goes LOW when control loop is no longer able to maintain constant current at PD. 6 OCA Over-current alarm (TTL/CMOS). Goes LOW when IBIAS exceeds the preset bias current limit. 7 GND Ground. 8 BIAS Laser bias current output. 9 VCC Power supply. 10 OUT+ Positive modulation current output. Sinks current when DIN is HIGH. 11 OUT- Negative modulation current output. Sinks current when DIN is HIGH. 12 GNDA Ground to output stage. 13 PD 14 CMPC Mean power control dominant pole capacitor. Connect to VCC via a capacitor. 15 GND Ground. 16 TCSLOPE Connecting a resistor between this pin and ground sets the temperature coefficient of IMODSET. 17 TCSTART Secondary temperature coefficient of IMOD. A resistor on this pin to ground sets the threshold temperature at which compensation starts. 18 MODSET Modulation current set. Connect a resistor between this pin and ground to set. 19 OCASET Over-current alarm set. Connect a resistor between this pin and ground to set. 20 VCC Power supply. 21 DIN Positive data input (PECL). Self biased. 22 DIN Negative data input (PECL). Self biased. 02067-DSH-001-G Function Monitor photodiode input. This input is connected to the monitor photodiode anode for automatic power control. Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 4 Pin Description Table 2-1. Pin Descriptions (Continued) Pin Number Pin Name 23 VCC Power supply. 24 GND Ground. Function Note: Center pad (pad 25) should be connected to ground. 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 5 3.0 Functional Description 3.1 Overview The M02067 laser driver consists of a high-speed modulation driver and a laser bias generator with mean power control (MPC). It is optimized for high speed, low power operation at 3.3V supply. Figure 3-1 demonstrates the functionallity of the M02067. Figure 3-1. M02067 Block Diagram VCC OUTOUT+ RD RSHUNT CSHUNT VCC DATA GNDA X100 DIS ENA BIASMON X1 55 MODMON IBIAS X60 IBIAS PD IMOD Failure Detect 55 FAIL RMPCSET 02067-DSH-001-G OCA SET OCA ROCA RTCSTART RTCSLOPE RMODSET VREF CMPC VCC Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 6 Functional Description 3.2 Features * Rise and fall times <150 ps * DC or AC-coupled modulation drive * Independently programmable laser bias and modulation currents * Bias current to 100 mA and modulation current to 85 mA at VCC = 3.3V * Automatic laser power control, with programmable temperature compensation and `Slow-Start' * Bias and modulation current monitors * Operates with +3.3V supply 3.3 Modulator The modulator output stage is designed to drive up to 85 mA in either AC-coupled or DC-coupled mode. DCcoupled performance depends on the laser used. The M02067 modulation output is optimized for driving a 25 load; the minimum required voltage at OUT+ and OUT- is 0.6V. To interface with the laser diode, a matching resistor (RD) is required for impedance matching. An RC shunt network is necessary to compensate for the laser diode parasitic inductance, thereby improving the optical eye. Typical values are RSHUNT = 51, CSHUNT = 3.3 pF Any capacitive loading at the cathode of a laser diode will degrade the optical output performance. An inductor is used to isolate the BIAS pin from the laser cathode. Figure 3-2 shows the typical IMOD vs RMODSET characteristic. Figure 3-2. Modulation Current for Given RMODSET Resistor 120 100 I (mA) MOD 80 60 40 20 0 0 4000 8000 12000 16000 20000 24000 28000 32000 RMODSET () 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 7 Functional Description Figure 3-3. Fibre Channel 1.0625 Gbps Electrical Eye Diagram Fibre Channel 1.0625 Gbps 30 mApp Modulation Current Figure 3-4. Gigabit Ethernet 1.25 Gbps Electrical Eye Diagram Gigabit Ethernet 1.25 Gbps 30 mApp Modulation Current 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 8 Functional Description Figure 3-5. 2 x Fibre Channel 2.125 Gbps Electrical Eye Diagram 2 x Fibre Channel 2.125 Gbps 30 mApp Modulation Current 3.4 Mean Power Control Loop The M02067 employs a Mean Power Control (MPC) loop to maintain a constant optical output power from the laser across temperature, time and power supply variations. Laser diodes used for communication purposes come with integrated photo-diodes to monitor the output power and provide the feedback for the MPC loop. The MPC loop (or its integrated safety features) cannot be used without this feedback. The MPC loop adjusts the laser bias current so that the monitor current from the photo-diode is matched to a reference current set by a single external resistor, RMPCSET. The time constant of the MPC loop is determined by CMPC. Table 3-1. MPC Loop Bandwidth CMPC 6 dB cutoff frequency 0 17 MHz 1 nF 100 kHz 10 nF 10 kHz 100 nF 1 kHz (at 6 dB cut off frequency) vs CMPC (for nominal process) Figure 3-6 shows the bias current vs RMPCSET over the full operating temperature range for a typical laser and monitor photodiode. 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 9 Functional Description Figure 3-6. Bias Current vs. RMPCSET 120 Bias current (mA) 100 80 60 40 20 0 0 5000 10000 15000 20000 25000 30000 50 85 35000 RMPCSET -40 0 25 Symbols shown indicate C There are two safety features integrated into the MPC loop; an Over-Current Alarm and an MPC loop failure alarm. The Over-Current Alarm (OCA) circuit limits the maximum bias current generated by the M02067. The bias current limit is set by an external resistor to ground, ROCA. When this limit is exceeded the OCA pin is asserted LOW. Figure 3-7 shows the maximum bias current limit vs ROCA. Figure 3-7. Maximum Bias Current vs. ROCA 100 90 80 I OCA (mA) 70 60 50 40 30 20 10 0 0 10000 20000 30000 40000 ROCA ( ) The MPC loop FAILure alarm (FAIL) is generated by the M02067 when the MPC loop can no longer maintain the constant current set by RMPCSET. When the MPC loop failure alarm is triggered the FAIL pin is asserted LOW. 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 10 Functional Description 3.5 Enable Control The M02067 incorporates a dual polarity laser enable function with both enable (ENA) and disable (DIS) inputs. Under normal operating conditions the ENA will be HIGH while DIS is LOW. Should ENA go LOW (or DIS go HIGH) both the bias and modulation currents will be disabled. Wire OR-ing the OCA and FAIL pins externally and connecting them to the ENA pin will automatically disable the bias and modulation currents when a failure occurs. 3.6 Current Monitors The M02067 features bias and modulation current monitor outputs. The BIASMON output sinks a current equal to nominally 1/55 of the laser bias current (IBIAS). The MODMON output sinks a current equal to nominally 1/55 of the laser modulation current (IMOD). BIASMON and MODMON should be connected through a pull-up resistor to VCC. Choose a pull-up resistor value that ensures a voltage at BIASMON greater than VCC - 1.6V and a voltage at MODMON greater than VCC - 1.0V. These pins should be tied to VCC if not used. 3.7 Slow-Start For laser safety and reliability, the M02067 incorporates a slow-start circuit that provides a delay of approximately 200 ns before enabling the laser diode. 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 11 Functional Description 3.8 Temperature Compensation The M02067 features built in temperature compensation of the modulation current is set using two external resistors, TCSLOPE and TCSTART see Figure 3-8. Current pulled from TCSLOPE adjusts the slope of the temperature compensation whereas current pulled from TCSTART sets the threshold temperature for the coefficient. Figure 3-8. Temperature Compensation 80mA 1 TC SLOPE 2 R MPCSET -40C 0mA TC START +80C Figures 3-9 through 3-11 show IMOD temperature compensation using a combination of resistor values for RTCSLOPE and RTCSTART. 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 12 Functional Description Figure 3-9. 0.06 0.058 0.056 IMOD (A) 0.054 0.052 0.05 0.048 0.046 0.044 0.042 0.04 -40 -20 0 20 40 60 80 100 Temperature (C) 5000 10000 20000 32000 RTC SLOPE - Figures shown are in RTC START = 0 , VCC = 3.3V Figure 3-10. 0.085 0.08 0.075 IMOD (A) 0.07 0.065 0.06 0.055 0.05 0.045 0.04 -40 -20 0 20 40 60 80 100 Temperature (C) 5000 10000 20000 32000 RTCSLOPE - Figures shown are in RTCSTART = 250 , VCC = 3.3V 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 13 Functional Description Figure 3-11. 0.1 0.09 0.07 I mod (A) 0.08 0.06 0.05 0.04 -40 -20 0 20 40 60 80 100 Temperature (C) 5000 10000 20000 32000 RTC SLOPE - Figures shown are in RTC START = 400 , VCC = 3.3V 3.9 Laser eye safety All lasers for commercial and industrial use, including lasers for optical communications are classified for eye safety considerations in IEC 60825-1, CDRH and other national standards. NOTE: 02067-DSH-001-G The M02067 alone does NOT ensure that any application within which it is used will be fully compliant with the relevant eye-safety requirements. It remains the sole responsibility of the user of this component to ensure that the application within which the M02067 is used meets all eye-safety requirements. Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 14 4.0 Packaging Specification 4.1 Packaging Specification Table 4-1. Packaging Specifications Parameter Value Assembly location ASE Malaysia X dimension (mm) 4.00 0.10 Y dimension (mm) 4.00 0.10 Z dimension (mm) 0.90 0.10 Pad standoff (mm) 0.02 + 0.03, -0.02 Terminal finish 100% Matte SN Marking Laser 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 15 Packaging Specification Figure 4-1. 02067-DSH-001-G M02067 QFN24 Package Outline Drawing Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 16 www.mindspeed.com General Information: Telephone: (949) 579-3000 Headquarters - Newport Beach 4000 MacArthur Blvd., East Tower Newport Beach, CA 92660 (c) 2010 - 2011 Mindspeed Technologies(R), Inc. All rights reserved. Information in this document is provided in connection with Mindspeed Technologies(R) ("Mindspeed(R)") products. These materials are provided by Mindspeed as a service to its customers and may be used for informational purposes only. 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Mindspeed customers using or selling Mindspeed products for use in such applications do so at their own risk and agree to fully indemnify Mindspeed for any damages resulting from such improper use or sale. 02067-DSH-001-G Mindspeed Technologies(R) Mindspeed Proprietary and Confidential 17