SFP+ Module Reference Design SFP_022AL_R0 General Description This evaluation board is a complete SFP+ module as defined in the SFP+ MSA document. The design uses Micrel’s MIC3003 controller, the 10G DFB/FP laser driver SY88022AL, and any of the following 10G limiting amplifiers: SY88053C/073L. A picture of the fully loaded board is shown on the next page. Datasheets and support documentation are available on Micrel’s web site at: www.micrel.com. Related Support Documentation • MIC3003 datasheet: Fibre optic module controller featuring digital diagnostic monitoring interface, as per SFF-8472/SFF-8432, with internal/external calibration and full laser control with bias and modulation current compensation for temperature variations using lookup tables. • SY88022AL datasheet • SY88053CL datasheet • SY88073L • MIC3003 software user’s guide. Features • Compliant with SFP+ MSA • Allows for easy and fast evaluation of Micrel’s chipset for SFP+ module • Multi-rate operation up to 10Gbps • Single, wide range power supply: 3.3V ±10% • Industrial temperature range: –40°C to +85°C Transmitter – FP/DFP Laser Diode Driver • Operates from a single 3.3V supply • Modulation current up to 60mA • Fast edge rates of 25ps • Bias current up to 80mA • Input equalizer • Small form factor 3mm × 3mm QFN package Receiver – Limiting Post Amplifier • External crosspoint adjustment (053CL/073L) • Digital offset correction (063CL/083L) • Wide differential input range (5mVPP to 1800mVPP) • Wide SD de-assert or LOS assert threshold range − 3mVPP to 30mVPP with 4dB typical electrical hysteresis • Fast SD/LOS assert/de-assert time (053CL/063CL) − 75ns typical; 120ns maximum • Selectable LOS or SD status signal indicator • Selectable RXOUT+/RXOUT- polarity (053CL/073L) • Available in a tiny 3mm × 3mm QFN package Controller • Extensive temperature range • Alarms and warnings interrupt and TXFAULT masks • Capability to support up to four chips on the serial interface • Integrated digital temperature sensor • Temperature compensation of modulation, bias, and fault levels via NVRAM lookup tables • User-writeable EEPROM scratchpad • Option to be used with Cisco security chip • Diagnostic monitoring interface per SFF-8472/8432 • Space saving 3mm × 3mm package available (MIC3003GFL) Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com May 13, 2015 Revision 1.0 Micrel, Inc. SFP_022AL_R0 Reference Design Evaluation Board Evaluation Board Setup TOSA and ROSA Installation Check the pin configuration of the TOSA and ROSA and install them according to the diagram shown in Figure 1. Receiver Sensitivity and Hysteresis Setting The limiting amplifier has a receive signal LOS/SD indicator. The LOS/SD sensitivity is set by the voltage at SD/LOSLVL (pin 8) adjusted by the value of R28, which forms a voltage divider with the 2.8kΩ internal resistor terminated to VCC-1.3V. Driver Laser Coupling The laser is AC-coupled to the driver. Compensation for laser parasitics can be improved by choosing appropriate values for R9 and C1. The laser’s response can be improved by tuning, in addition to R9/C1, R1/R5 and L1/L2/L5/L6/R6/R7. The optimal values of these components depend on the length of the laser leads/flex and can vary from one family of lasers to another. It is up to the user to tune the values in order to achieve the best compensation for the laser used with this board. Figure 1. Mounting of TOSA and ROSA May 13, 2015 2 Revision 1.0 Micrel, Inc. SFP_022AL_R0 Reference Design Setup and Operation and register address, then select GET to read the content or enter a new value, and select SET NEW to write. In this procedure, the bits are set on the panels. 1. Set the desired frequency on a pattern generator with amplitude between 200mVPP and 1800mVPP. Typical 7 23 data patterns are 2 -1 or 2 -1 PRBS patterns, depending on the application. Because the inputs to the board are AC-coupled, the voltage offset of the pattern generator is not significant, so it can be set between GND and VCC. 9. Refer to the MIC3003 Software User’s Guide for the detailed settings and illustrations. 10. On the Panels list, select OEM CONFIG 3-4 and select EXTERNAL CALIBRATION (default setting), LOS COMPARATOR ENABLE, SHDN, RXLUT INPUT TEMPERATURE, and RSOUT. If needed, later set ISTART to a different value to speed up the APC loop during laser turn ON after a FAULT occurrence. Close this window to return to the main window. 2. Connect the pattern generator with differential outputs as a data source to the TXIN+ and TXIN- inputs on the host board. Use matched length differential cables. 3. Connect the USB plug-in of the host board to the USB port of the computer. 11. On the Calibration list, select EXTERNAL CALIBRATION. Set all the OFFSETS to 0 and SLOPES to 1. For RXPWR, set only RX_PWR(1) to 1. These parameters might need to be changed later to correct the measured values (calibration). Close this window to return to the main window. 4. Connect the 3.3V red post on the host board to the output of the 3.3V power supply and the black post to the GND and install a jumper between pin 2 and pin 3 of SW1. 5. Plug the SFP module into the host board connector and connect the laser to the optical plug-in of the scope. 12. On the Panels list, select OEM CONFIG 0-2 to open the OEM configuration windows for registers 0, 1, and 2. Check the default setting of each and reset the parameters to the correct values (below) if needed. a. In the OEM Configuration Register 0 window, set ENABLE/DISABLE to DISABLE, and set VMOD REFERENCE to GND. b. In the OEM Configuration Register 1 window, set APC OP-AMP TYPE to EMITTER FOLLOWER, select the voltage to report VINH:VINL, and set the feedback voltage source to 1.22V. Also set FEEDBACK BIAS REF and RES TERMINATION to GND and set VBIAS DRIVE to SOURCE (NPN). Set INTERNAL FEEDBACK RESISTOR to INF. c. In the OEM Configuration Register 2 window, the MIC3003 address can be modified. 13. In the OEM Configuration Register 0 window, set ENABLE/DISABLE to ENABLE. 14. On the Panels list, select User. Check APCSET0 and MODSET0 in the USER CONTROL REGISTER (default setting). All the other parameters’ functionality can be checked later. Return to the main window. 15. On the Panels list, select OEM Settings and enter the following values: 6. Turn on the power supply. a. Enter 255 for the IBIAS FAULT and TX PWR FAULT thresholds. 7. Launch the MIC3003 software, select the serial address of the device to be scanned (A0 is the default address), and then click initialization. The main window will open. b. Enter 0 for LOSS-OF-SIGNAL threshold and 0 for FAULT SUPPRESSION TIMER. c. 8. Memory content can be read and/or modified on the panels or by accessing the registers directly by selecting ALL REGISTERS, enter the serial address May 13, 2015 3 Enter desired DAC values for bias and modulation between 0 and 255. Revision 1.0 Micrel, Inc. SFP_022AL_R0 Reference Design d. After entering these values, select SET NEW. Select GET CURRENT to ensure the set values are written to the registers. You may come back to this panel to mask the faults by checking them at the bottom of the window. Now return to the main window. Then connect the output of the VOA to the input of the receiver using an appropriate fiber jumper. 19. If the installed receiver has RSSI signal, the value of the received power should display, but may need calibration. 20. At this stage, the masked faults should be unmasked. If there is a fault indication, mask the indicated fault in the OEMCONFG register (step 9) and try to find the cause of the fault by checking the monitored values and taking appropriate measurements. 16. On the Panels list, select Result. The values of the five monitored parameters as per the SFF-8472 should now display. Set the alarm and warning thresholds (optional) and select SET NEW LIMITS. Select GET CURRENT LIMITS to check that the set values are written into the registers. Return to the main window. 21. Once the module runs without fault indication, proceed to BER measurement, eye diagram analysis, and laser driver and post amplifier performance evaluation. 17. After setting the new value for bias or modulation current, toggle TXDISABLE/TXENABLE in the main window or WARMRESET in the OEMCFG0-2 window. 18. Connect the laser to a variable optical attenuator (VOA) and adjust the attenuation to bring the optical power to the desired level at the input of the receiver. May 13, 2015 4 Revision 1.0 Micrel, Inc. SFP_022AL_R0 Reference Design Laser Response Tuning Overshoot/Undershoot The damping resistors R1 and R5 installed in series with the laser are 5Ω. This value might be replaced with higher values to minimize or suppress any overshoot or undershoot on the optical signal out of the laser. Keep in mind that higher value damping resistors will lead to higher rise/fall time and less modulation current driving the laser.The compensation network comprised of R6/C15 can also be used for that purpose and to compensate for the laser package’s parasitic inductance. The values indicated on the schematic and pre-installed on the board accordingly to the BOM may be replaced with different values to optimize the laser response. Other components that can be adjusted to improve the laser response are the elements of the output termination network (L2, L3, R2, R3, R4, R13). Evaluation Board Schematic Power and Receiver May 13, 2015 5 Revision 1.0 Micrel, Inc. SFP_022AL_R0 Reference Design Evaluation Board Schematic (Continued) Transmitter May 13, 2015 6 Revision 1.0 Micrel, Inc. SFP_022AL_R0 Reference Design PCB Assembly Top Bottom May 13, 2015 7 Revision 1.0 Micrel, Inc. SFP_022AL_R0 Reference Design Bill of Materials Item Part Number C1 ECJZEC1E010C C5-8 GRM033R71A103KA01D C17, C21-23, C26 C1005X7R1E103K050BB C20 ECJ0EB1C183K C2-4, C9, C1819, C24-25, C2734 C1005X7R1C104K050BC C11-14 ECJZEB1A104M C4 C1005X5R0J106M050B L4-6, L8-10 BLM15BD121SN1 L1-3, L7 HZ0402A601R-10 or BLM15HG601 Manufacturer Panasonic (1) Description Qty. CAP CER 1PF 0201 1 0.01µF, 25V, 10% Ceramic Capacitor, Size 0201, X5R, Dielectric 4 0.01µF, 25V, 10% Ceramic Capacitor, Size 0402, X5R, Dielectric 5 0.018µF, 25V, 10% Ceramic Capacitor, Size 0402, X5R, Dielectric 1 TDK CAP CER 0.1µF 16V 10% X7R 0402 16 Panasonic CAP CER 0.1µF 16V 10% X7R 0201 4 TDK CAP CER 10µF 6.3V 20% X5R 0402 1 Ferrite, Filter Chip, 120 OHM@100Mhz 1.5A, 0402 6 Ferrite, 600 OHM@100Mhz 100mA, 0402 2 Murata (3) (Error! Reference TDK source not found.) Panasonic Murata Laird (Error! Technologies Reference source not found.) or Murata R1, R5 ERJ-1GEF15R0C Panasonic RES 15 OHM 1/10W 1% 0201 SMD 2 R21-22, R33-34 ERJ-2GEJ100X Panasonic RES 10 OHM 1/10W 5% 0402 SMD 4 R20, R35 ERJ-2RKF24R9X Panasonic RES 24.9 OHM 1/10W 1% 0402 SMD 1 R6-7 ERJ-2GEJ101X Panasonic RES 100 OHM 1/10W 5% 0402 SMD 2 R18 ERJ-2GEJ131X Panasonic RES 130 OHM 1/10W 1% 0402 SMD 1 R9 ERJ-1GEF1470C Panasonic RES 147 OHM 1/10W 1% 0201 SMD 1 RES 499K OHM 1/10W 1% 0402 SMD 1 (6) R20 ERJ-2RKF4993X Vishay R32 ERJ-2GEJ102X Panasonic RES 1K OHM 1/10W 5% 0402 SMD 2 R15, R19, R28, R31 ERJ-2GEJ103X Panasonic RES 10K OHM 1/10W 5% 0402 SMD 4 U3-4 NST3001 ON Semi Dual PNP transistor 2 FOM Controller 1 (7) (7) U1 MIC3003GML Micrel, Inc. U2 SY88022AL Micrel, Inc. 10G DFB Laser Diode Driver 1 U5 MIC94161-5 Micrel, Inc. Dual output LDO 1 U6 SY88053CL Micrel, Inc. 10 Limiting Post Amplifier 1 SFP_022AL_R0 Micrel, Inc. SFP+ module PCB 1 Note: 1. Panasonic: www.panasonic.com. 2. Murata: www.murata.com. 3. TDK: www.tdk.com. 4. Laird Technologies: www.lairdtech.com. 5. Vishay: www.vishay.com. 6. On Semi: www.onsemi.com. 7. Micrel, Inc.: www.micrel.com. May 13, 2015 8 Revision 1.0 Micrel, Inc. SFP_022AL_R0 Reference Design TCG Support Application Hints and Notes Hotline: 408-955-1690 For application notes on high-speed termination on high bandwidth FOM and clock synthesizer products, SONET jitter measurement, and other high bandwidth products, go to Micrel’s website at: http://www.micrel.com. Email Support: [email protected] MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel, Inc. is a leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and timing & communications markets. The Company’s products include advanced mixed-signal, analog & power semiconductors; high-performance communication, clock management, MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe, and Asia. Additionally, the Company maintains an extensive network of distributors and reps worldwide. Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2015 Micrel, Incorporated. May 13, 2015 9 Revision 1.0