SY88973/SY88982/MIC3001-Based SFP Module TXRX_982_R1 Evaluation Board General Description Features This evaluation board is an implementation of the SFP module in a different form factor with on board faults indicators (LEDs) and a DB-25 connector for serial communication. The design uses Micrel's MIC3001 controller, SY88982 (pin compatible with SY88782 and SY88932) driver, and SY88973 limiting amplifier. A picture of the fully bonded board is shown below. • Allows for easy and fast evaluation of Micrel’s chipset for SFP module • On board FAULTs indicators • Easy access to the components for rework and different options implementation Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. Related Support Documentation • MIC3001 Data Sheet • SY89307 Data Sheet • SY89973 Data Sheet • MIC3000/1 Software User’s Guide IC Description • SY88982: Low power small form factor (3mm x 3mm) laser driver up to 3.2Gbps data rate and 2.3V compliance voltage. SY88782 is a lower speed version up to 1.25Gbps. • MIC3001: SFP module controller featuring digital diagnostic monitoring interface as per SFF-8472 with internal/external calibration and full laser control with bias and modulation current compensation for temperature variations using look up tables. • SY88973: Multi-rate 155-3200Mbps low sensitivity limiting amplifier. ______________________________________________________________________________ Evaluation Board ROSA To Computer Parallel Port TOSA DFB / FP DRIVER INPUT September 2004 L.A. OUTPUT M9999-092304 [email protected] or (408) 955-1690 Micrel TXRX_982_R1 Evaluation Board SY88843 Limiting Amplifier Evaluation Board Setting The SY88843 limiting amplifier has a signal detect (SD) indicator. To improve the hysteresis on the receive signal LOS, remove R2 and install R3, Q6, and R23. The combination of R3 and R1 will determine the sensitivity of the transceiver and hysteresis on the SD. Refer to the application note entitled "Notes on Sensitivity and hysteresis in Micrel's Post Amplifiers" available at Driver Laser Coupling Table 1 summarizes the setting of the board for the two configurations, driver DC-coupled or AC-coupled to the laser. Configuration Remove Install Driver and Laser DC-Coupled L2, L3, L7, L8, R14, R6, R13, C24, C36 Install a 0 at C24 and C38. Driver and Laser AC-Coupled http://www.micrel.com/product-info/app_hints+notes.shtml. TOSA and ROSA Installation L2, L3, L7, L8, R14, R6, R13, C24, C36 Check the pinout of the laser and receiver and install them accordingly to the diagrams shown on Figure 1. Board Edge Table 1. Configuration Settings Receiver Sensitivity and Hysteresis Setting Top Pad LD Anode SY88973 Limiting Amplifier Top Pad LD Cathode The SY88973 limiting amplifier is the default post amplifier installed on the board. It has a receive signal LOS indicator. To improve the hysteresis on the receive signal LOS, install R2 and uninstall R3. The combination of R2 and R1 will determine the sensitivity of the transceiver and hysteresis on the receive signal LOS. Refer to the application note entitled "Notes on Sensitivity and hysteresis in Micrel's Post Amplifiers" available at Top Pad DATA- Bottom Pad PD Cathode Bottom Pad NC Bottom Pad RSSI Top Pad GND Top Pad DATA+ Bottom Pad VCC Figure 1. Mounting of Laser and Receive http://www.micrel.com/product-info/app_hints+notes.shtml. September 2004 2 M9999-092304 [email protected] or (408) 955-1690 Micrel TXRX_982_R1 Evaluation Board 12. In OEM Configuration Register 0 window, set ENABLE/DISABLE to DISABLE, VMOD REFERENCE to GND, and temperature zone to INTERNAL. Set-Up and Operation Follow the step-by-step procedure to set-up the board safely and properly: 1. Connect the on board DB-25 connector to the parallel port of a computer. 13. In OEM Configuration Register 1 window: a. Set APC OP-AMP TYPE to COMMON EMITTER. Note: Set the selection bit to 0, 0 should correspond to EMITTER FOLLOWER, which should be displayed on the bottom and COMMON EMITTER on the top. 2. Connect the differential input of the laser driver to DATA output of the pattern generator. 3. Use a multimode fiber jumper, with appropriate connectors to connect optical output of the VCSEL to a VOA (variable optical attenuator) preset to 0dB attenuation. b. Select the voltage to report in VINH:VINL. 4. Connect the output of the VOA to the optical input of the DCA, power-meter, or optical to electrical converter. c. d. Set FEEDBACK BIAS REF and RES TERMINATION to GND and VBIAS DRIVE to SOURCE (NPN). Set INTERNAL FEEDBACK RESISTOR to an arbitrary value (1.6K for example). 5. Pre-adjust the power supply to 3.3V and turn it off. Connect TP3 to VCC (3.3V) and TP5 to GND, then turn the power supply ON. The total current drawn from the power supply should be less than 300mA. e. Set FEEDBACK BIAS REF and RES TERMINATION to GND and VBIAS DRIVE to SOURCE (NPN). 6. Launch the MIC3000/1 software. The MIC3001 Optical Transceiver Management IC panel opens with Panels and Help grayed out and only Utilities can be run. f. 7. Refer to MIC3000/1 Software User’s Guide for the detailed settings. Set INTERNAL FEEDBACK RESISTOR to arbitrary value (1.6K for example). 14. In OEM Configuration Register 2, the MIC3001 address and look-up table offset can be modified. The look-up table covers 128°C. The temperature range for offset = 0 is 0° to +127°C.) This range can be shifted down by 2x the value. The offset is set to. If offset = 15, the temperature range becomes –30° to +97°C. 8. On the main window select Utilities to open the utilities panel, then select SCAN to read the address of the MIC3001 and GET to read the manufacturer ID, Device ID, and Die Revision. If there is a failure in reading one of these parameters, you cannot proceed further. If all the parameters are read correctly, close the Utilities window to return to the main window where Panels and Help are no longer grayed out. 15. In OEM Configuration Register 0 window, set ENABLE/DISABLE to ENABLE. 16. On 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 the window to return to main window. 9. Select Panels to display the list of setting panels. 10. All the bits displayed on the panels can be read and/or modified on the panels or by accessing the registers directly by selecting ALL REGISTERS, enter the serial address, the register address, select GET to read the content or type a value and select SET NEW to write. In this procedure the bits are set on the panels. 17. On Panels list, select External Calibration. Set all the offsets to 0 and slopes to 1. Set RX_PWR(1) to 1. These parameters might need to be changed later to correct the measured values (calibration). Return to the main window. 11. Select OEM CONFIG 0-2 to open the OEM configuration registers 0, 1, and 2 windows. September 2004 Set Feedback voltage source to 1.22V. 3 M9999-092304 [email protected] or (408) 955-1690 Micrel TXRX_982_R1 Evaluation Board 23. At this step, there is no received power since no signal is applied at the input of the receiver. 18. On Panels list, select Temperature Compensation. Load look-up tables for APC, Modulation, Bias current Fault, and End-ofLife from appropriate files. If no loading is done, the default value 0 is used for all the LUT. Return to the main window. 24. Adjust the VOA to bring the optical power to the desired level at the input of the receiver. Then connect the output of the VOA to the input of the receiver using appropriate fiber jumper. 19. On Panels list, select OEM settings. Enter the desired DAC values between 0 and 255 for the displayed parameters then select SET NEW. Select GET CURRENT to make sure that the set values are written into the registers. Checking them can mask the faults. Return to the main window. 25. If the installed receiver has RSSI signal, a value (needs calibration) of the received power should be displayed now. 26. On Panels list, select TX Setup to calibrate the TX power. Measure the optical power at the output of the VCSEL and enter the value (in mW) in the MEASURED TX POWER box, then select CALIBRATE. The monitored value is adjusted to display the measured value by automatically changing the slope set in the EXTERNAL CALIBRATION window. Reconnect the VOA to the VCSEL and return to the main window. 20. On Panels list, select User. Check APC0 in the USER CONTROL REGISTER (default setting). All the other parameters can be checked later to verify their functionality. Return to the main window. 21. On Panels list, select Result. The values of the five monitored parameters as per SFF8472 are now displayed. Type the alarm and warning thresholds and select SET NEW LIMITS. Select GET CURRENT LIMITS to check that the set values are written into the registers. Return to main window. 27. On Panels select RX Calibration. Measure the input power to receiver at the output of the VOA and enter the measured value (in mW) in the MEASURED RX POWER box then select CALIBRATE. The monitored value is adjusted to display the measured value by automatically changing the slope set in the EXTERNAL CALIBRATION window. Reconnect the VOA to the receiver and return to the main window. 22. Set modulation current and bias current to get the desired output power and extinction ratio out of the laser. Use OEM Settings panel or TX Setup panel to do that: a. In OEM settings window, set the bias by entering a value from 10 to 255 in APC SET POINT 0 box and modulation by entering a value from 10 to 255 in MOD DAC setting box followed by SET new. b. In TX calibration window, set the bias by entering a value from 10 to 255 in APCO (DEC) box and modulation by entering a value from 10 to 255 in MOD DAC setting box followed by SET new. After setting the new value for bias or modulation current, toggle TXDISABLE/TXENABLE on the main window. September 2004 28. At this stage, the masked faults should be unmasked and if there is a fault indication try to find the cause for it and fix it to get the transceiver running fault free and try to measure the performance of the laser driver and post amplifier. 4 M9999-092304 [email protected] or (408) 955-1690 Micrel TXRX_982_R1 Evaluation Board Laser Response Tuning Performance Overshoot/Undershoot Figure 2 shows an optical eye diagram obtained with a Fabry Perrot laser driven differentially. The damping resistors R8 and R24 installed in series with laser are 20. This value might be tuned to a higher value to minimize or suppress any overshoot or undershoot on the optical signal out of the laser, but keep in mind that higher value damping resistors will lead to higher rise/fall time. (2.5Gbps), PRBS 223–1, ER = 9.5 Laser's Package Inductance Compensation A compensation network comprised of C9/R26 or C9/R31 can be used to compensate for the laser package inductance. R26 and R31 share the same pad on the board, so only one at a time can be installed. The values shown on the schematic are used for the symbol only. C9 should be a few pF and R26/R31 around 50 . September 2004 TIME (67ps/div.) Figure 2. Optical Eye Diagram 5 M9999-092304 [email protected] or (408) 955-1690 TXRX_982_R1 Evaluation Board RSOUT RXLOS RSIN TXDISABLE TXFAULT SHDN Micrel VCC_T VCC_T from sheet 2 VCC_T R28 10K R11 0Ω JP4 HEADER 4 Q3 R22 10K 1 2 3 4 R33 10K R18 10K R34 10K R21 10K VCC_T VCC_T VCC_T R49 10K C10 0.1µF R25 10K R26 R31 Q4 14 3 16 4 17 5 18 6 5 4 3 2 FB 1 R17 47K C13 0.1µF R32 0Ω R7 270 DATA R39 0Ω R29 10K C38 0.1µF 50 Ohm TL L7 OUT OUT /OUT /OUT R14 C24 12 11 10 C36 9 8 GND 7 GND 6 VCC 5 VCC J3 VCC_T 13 13 GND J2 1 GND 2 DIN 3 /DIN 4 GND 50 Ohm TL R45 3.3Ω C42 0.1µF R24 R8 Q2 L2 14 VREF 15 IM_SET 16 /EN C33 0.1µF 11 24 12 25 L1 VCC_T C41 0.1µF U4 SY88982 9 22 10 23 R52 1.5K R12 1.5K C35 0.1µF R36 0Ω R6 TBD 19 7 20 8 21 1 2 3 VCC_T R4 TBD VCC_T J8 R53 0Ω 4 R27 TBD C19 0.018µF 1 R20 270 R16 TBD 6 19 20 21 22 23 24 C26 0.1µF 8 VILD+ VILDVDDA GNDA VMPD GNDD 17 NC 18 VDDD J1 2 15 VIN RSIN C9 C37 0.1µF 25 Ohm TL R19 10K CLK TXFAULT XPN VRX SHDN 13 14 15 16 VMOD C27 0.1µF 1 2 3 4 5 6 7 12 11 10 9 8 7 VCC_T VMOD- C28 1µF 16 VDD A0 15 DATA A1 14 CLK A2 13 /ALERT P0 12 P7 P1 11 P6 P2 10 P5 P3 9 P4 GND VCC_T TXDISABLE VCC_T U1 MIC74 RXLOS RSOUT COMP VBIAS VCC_T L6 C12 0.1µF U2 MIC3000-1 COMMON ANODE +5V VRX VCC_T 25 Ohm TL R15 L3 R13 TBD L8 C32 0.1µF VCC_T Figure 2. Transmitter VCC_T 3 C7 0.1µF C2 VCC_R VCC_R C29 10µF C30 10µF C1 C23 0.1µF TP6 L4 6 5 2 1 4 TP7 TP9 C31 10µF Q5 MIC94052 +3.3 TP5 L5 R5 0Ω U5 INA138 C3 5 V+ OUT 1 GND 2 4 VIN- VIN+ 3 VRX to sheet 1 R47 10K R42 160K TP8 J6 VCC_R C16 0.1µF C34 1µF C8 0.1µF R48 1.5K VCC_R +5V 1 2 3 4 5 C17 0.1µF R1 TBD VCC_R VCC_R C20 0.1µF C6 0.1µF C14 0.1µF 12 DOUT GND 10 GND 9 /DOUT 11 C18 0.1µF 1 DIN 2 GND 3 GND 4 /DIN C15 0.1µF 8 7 50 Ohm TL VCC_T C25 0.1µF VCC LOS CAP VCC J5 50 Ohm TL 13 14 15 16 /EN VCC 50 Ohm TL VCC LOSLVL J4 U3 SY88973 6 5 VCC_T VCC_R U6 74LCX04 C21 0.1µF C5 0.1µF VCC_R Q1 R2 TBD VCC_T VCC_T VCC_T VCC_T R50 270 R51 270 R37 270 R38 270 R9 270 R10 270 D3 D4 D5 D6 D7 D8 C4 0.1µF VCC_R C22 0.1µF VCC_T 50 Ohm TL from Sheet 1 SHDN TXFAULT TXDISABLE RXLOS RSIN RSOUT 7 14 GND VCC 1 2 A0 /O0 3 4 A1 /O1 5 6 /O2 A2 9 8 /O5 A5 11 10 /O4 A4 13 12 /O3 A3 VCC_R R3 TBD R30 270 R23 10K D9 Q6 NPN Figure 3. Receiver September 2004 6 M9999-092304 [email protected] or (408) 955-1690 Micrel TXRX_982_R1 Evaluation Board PCB Layout/Assembly September 2004 7 M9999-092304 [email protected] or (408) 955-1690 Micrel TXRX_982_R1 Evaluation Board Bill of Materials Driver AC-Coupled to the Laser Item Part Number Manufacturer (1) Description Qty. C1–C6, C8, C10, C12–C18, C20–C27, C32, C33, C35–C38, C41, C42 Vishay 0.1µF, 25V, 10% Ceramic Capacitor, Size 0402 31 C19 Vishay(1) 0.01µF Ceramic Capacitor, Size 0402 1 C28, C34 Vishay(1) 1µF Ceramic Capacitor, Size 0603 2 10µF, Y, Tantalium Solid Electrolytic Capacitor, Size 1206 1 Red, LED 7 Receptacle DB-25 R/A Connector, 25 Position 1 SMA End Launch Receptacle Connector 4 ROSA 1 C29-C31 ECSH0GY106R D3-D9 67-1636-1-ND Vishay (1) Digi-Key(2) AMP (3) J1 745783 J2-J5 142-0711-821 Johnson Components(4) J6 D12M-9060-A Luxnet(5) (6) J8 FOL137-xx-Oxx-x4 FP/DFB Laser, Common Anode 1 L1–L3, L6 BLM18HG102SN Murata(7) Inductor 4 L4, L5, L7, L8 IMC 0805 RK 122 J 01 Vishay(1) 1.2µH Ferrite Bead Inductor, Size 1206 2 Q2 MMBT3904 Fairchild Semiconductor(8) General Purpose NPN Transistor (SOT-23) 2 Q3 MMBT3906 Fairchild Semiconductor(8) General Purpose PNP Transistor (SOT-23) 2 R1, R18, R19, R21, R22, R25, R28, R29, R33, R34, R47, R49 CRCW04021002F Vishay(1) 10k, 5% Resistor, Size 0402 12 R5, R11, R16, R27, R32, R39, R53 CRCW04021002F Vishay(1) 0, 1% Resistor, Size 0402 7 R6, R13 CRCW040275R0F Vishay(1) 75.0, 1% Resistor, Size 0402 2 R7, R9, R10, R20, R30, R37, R38, R50, R51 CRCW04022740F Vishay (1) 274, 5% Resistor, Size 0402 9 R8, R24 CRCW0402230R1F Vishay(1) 30.1, 1% Resistor, Size 0402 2 R14, R15 CRCW040233R2F Vishay(1) 33.2, 1% Resistor, Size 0402 2 R17 CRCW04024752F Vishay (1) 47K, 1% Resistor, Size 0402 2 R45 CRCW04023R32F Vishay(1) 3.32, 1% Resistor, Size 0402 1 CRCW04021501F (1) 1.5k, 5% Resistor, Size 0402 1 R48 Fitel Vishay (9) TP3 5010 Keystone Red, Color Coded PCB Test Point 1 TP5 5010 Keystone(9) Black, Color Coded PCB Test Point 1 U1 MIC74 U2 U3 MIC3001 SY88973 Micrel(10) 2-Wire Serial I/O Expander 1 Micrel (10) Optical Transceiver Management IC 1 Micrel (10) 3.2Gbps Limiting Post Amplifier 1 (10) U4 SY88982 Micrel Laser Driver 1 U5 INA138 TI (BurrBrown)(11) High Side Measurement Current Shunt Monitor 1 U6 74LCX04 Fairchild(8) Low Voltage Hex Inverter with 5V Tolerant Inputs 1 TXRX_982_R1 Micrel(10) Bare PCB 1 September 2004 8 M9999-092304 [email protected] or (408) 955-1690 Micrel TXRX_982_R1 Evaluation Board Notes: 1. Vishay: www.vishay.com 2. Digi-Key: www.digikey.com 3. AMP: www.amp.com 4. Johnson Components: www.johnsoncomponents.com 5. Luxnet: www.luxnetcorp.com 6. Honeywell: www.furukawa.com 7. Murata: www.murata.com 8. Fairchild Semiconductor: www.fairchildsemi.com 9. Keystone: www.keystone.com 10. Micrel, Inc.: www.micrel.com 11. TI: www. ti.com September 2004 9 M9999-092304 [email protected] or (408) 955-1690 Micrel TXRX_982_R1 Evaluation Board Micrel Cross Reference Application Hints and Notes To find an equivalent Micrel part, go to Micrel’s website at: http://www.micrel.com and follow the steps below: For application notes on high speed termination on PECL and LVPECL products, clock synthesizer products, SONET jitter measurement, and other High Bandwidth product go to Micrel Semiconductors’ website at http://www.micrel.com/. Once in Micrel’s website, follow the steps below: 1. Click on Dynamic Cross Reference. 2. Enter competitor’s part number in the Dynamic Cross Reference field. 1. Click on “Product Info”. 2. In the Applications Information Box, choose “Application Hints and Application Notes.” 3. To download a PDF version of this information, click on the Cross Reference PDF tab. HBW Support Hotline: 408-955-1690 Email Support: [email protected] MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. 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. © 2004 Micrel, Incorporated. September 2004 10 M9999-092304 [email protected] or (408) 955-1690