september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 sy88973/sy89307/mic3001-based sfp module txrx_307_r0 evaluation board tosa dfb / fp rosa driver input l.a. output to computer parallel port general description 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, sy89307 vcsel driver, and sy88973 limiting amplifier. a picture of the fully bonded board is shown below. data sheet 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 features ? allows for easy and fast evaluation of micr el?s chipset for sfp module ? on board faults indicators ? easy access to the components for rework and different options implementation ics description ? sy89307: low power, small form factor (2mmx2mm) vcsel driver up to 2.5gbps data rate. ? mic3001: sfp module controller featuring digital diagnostic monitoring interface 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 155mbps to 3200mbps low sensitivity limiting amplifier. ______________________________________________________________________________ evaluation board tosa vcsel rosa driver input l.a. output to computer parallel port
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 2 evaluation setting default setting the board comes with the driver set to drive a common anode vcsel differentially. table 1 shows the modifications to make on the board for different configurations. configuration remove install common anode differential r22, r45, r46, r24, r32 r15, r19, r36, r48, c9, l2 common anode single ended r22, r45, r46, r24, r32, r8, c36 r15, r19, r36, r48, c9, l2 common cathode differential r15, r19, r36, r48, c9, l2 r22, r45, r46, r24, r32 common cathode single ended r15, r19, r36, r48, c9, l2 r22, r45, r46, r24, r32, r8, c36 table 1. configuration settings r15 = r22 = 3.3 r45 = r46 = r24 = r32 = r19 = r36 = r48 = 0 r8 =10-50 c9 = c36 = 0.1 f receiver sensitivity and hysteresis setting sy88973 limiting amplifier the sy88973 is the default limiting amplifier. it has a receive signal los indicator. to improve the hysteresis on the receive signal los, install r47 (0 ) and r43. the combination of r43 and r41 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: http://www.micrel.com/product-info/app_hints+notes.shtml. sy88843 limiting amplifier the sy88843 can also be installed on the board. it has a signal detect sd indicator. to improve the hysteresis on the receive signal los, remove r47 (0 ) and install r43, q2, and r43. the combination of r43 and r41 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: http://www.micrel.com/product-info/app_hints+notes.shtm tosa and rosa installation check the pin out of the vcsel and receiver and install them according to the diagrams shown on figure 1. top pad ld anode top pad ld cathode bottom pad pd cathode bottom pad nc top pad data- top pad data+ top pad gnd bottom pad rssi bottom pad vcc board edge top pad ld cathode top pad ld anode bottom pad pd anode bottom pad nc top pad data- top pad data+ top pad gnd bottom pad rssi bottom pad vcc board edge (a) common cathode vcsel (b) common anode vcsel figure 1. mounting of laser and receiver
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 3 set-up and operation follow the step-by-step procedures, described below, to set-up the board safely and properly: 1. connect the on board db-25 connector to the parallel port of a computer. 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. 4. connect the output of the voa to the optical input of the dca, power-meter, or optical to electrical converter. 5. pre-adjust the power supply to 3.3v, turn it off, and connect tp3 to v cc (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. 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. 7. refer to mic3000/1 software user?s guide for the detailed settings. 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 the panels and help are no longer grayed out. 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. 11. select oem config 0-2 to open the oem configuration registers 0, 1, and 2 windows. 12. in oem configuration register 0 window, set enable/disable to disable, vmod reference to vdd , and temperature zone to internal . 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. b. select the voltage to report in vinh:vinl. c. set feedback voltage source to 1.22v. d. if a common cathode vcsel is used, set feedback bias ref and res termination to vdd and vbias drive to sink (pnp) . e. if a common anode vcsel is used, set feedback bias ref and res termination to gnd and vbias drive to source (npn) . f. set internal feedback resistor to an 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 128c. the temperature range for offset = 0 is 0 to +127c.this range can be shifted down by 2x offset. the offset is set to. if offset = 15, the temperature range becomes ?30 to +97. 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 start- up during laser turn on after a fault occurrence. close the window to return to main window. 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.
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 4 18. on panels list, select temperature compensation . load look-up tables for apc, modulation, bias current fault, and end-of- life from appropriate files. if no loading is done, the default value 0 is used for all the lut. return to the main window. 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. 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 sff- 8472 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. 22. set modulation current and bias current to get the desired output power and extinction ratio at the output of the vcsel. use oem settings panel or tx setup panel to accomplish the following: a. in oem settings window, set the bias by entering a value from 10 to 100 in apc set point 0 box and modulation by entering a value from 10 to 100 in mod dac setting box followed by set new. b. in tx calibration window, set the bias by entering a value from 10 to 100 in apco (dec) box and modulation by entering a value from 10 to 100 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. 23. at this step, there is no received power since no signal is applied at the input of the receiver. 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. 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. 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. 28. at this stage, the masked faults should be unmasked and if there is a fault indication try to find the cause of it and fix it to get the transceiver running fault free and try to measure the performance of the laser driver and post amplifier.
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 5 laser response tuning overshoot/undershoot the damping resistors r8 and r9 installed in series with laser are 10 . 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. laser's package inductance compensation a compensation network comprised of c10/r35 or c10/r14 can be used to compensate for the laser package inductance. r35 and r14 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. c10 should be a few pf and r35/r14 around 50 . performance figure 2 shows an optical eye diagram obtained with honeywell hfe4190-541 vcsel (common anode) driven differentially: 2xfc (2.125gbps), prbs 2 23 ?, er = 10 mask set to 30% time (100ps/div.) figure 2. optical eye diagram
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 6 vcsel from sheet 2 50 ohm tl 50 ohm tl j3 j2 vcsel-ca j7 r10 127 ? r12 127 ? l1 l2 r26 50r r7 50r db25 j1 c10 0.1 f c37 0.1 f c36 0.1 f c35 0.1 f c27 0.1 f 0.1 f c39 c13 0.1 f c12 0.1 f c11 0.1 f c9 0.1 f c8 0.1 f c32 0.1 f c38 0.1 f c33 0.1 f c26 0.1 f c19 0.018 f r35 270 ? q5 q4 q3 c28 1 f r21 10k r34 10k r33 10k r11 10k r25 10k tbd r22 r16 tbd r15 tbd r13 tbd r4 tbd r27 tbd r18 4.7k r17 47k u3 sy89307 u2 mic3000-1 v cc _t r14 270 ? v cc _t v cc _t v cc _t header 4 jp2 vrx u1 mic74 v cc _t v cc _t v cc _t v cc _t v cc _t v cc _t +5v v cc _t v cc _t v cc _t 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 9 /alert data gnd vdd clk a0 a1 a2 p0 p1 p2 p3 p7 p6 p5 p4 1 2 3 4 v cc _t r1 10k r2 270 r3 270 r5 10k r6 10k r8 tbd r9 tbd r20 10k r23 10k 13 14 15 16 17 18 12 19 20 11 21 10 22 23 24 98 7 6 5 4 3 2 1 vctrl vbb vcc vee /d /q d q 1 2 3 4 8 7 6 5 14 2 15 3 16 4 17 5 18 6 19 7 20 8 21 9 22 10 23 11 24 12 25 13 1 r36 0 ? r45 0 ? r19 0 ? r46 0 ? c7 0.1 f r32 0 ? r24 0 ? r48 0 ? 1 2 3 4 shdn rsout rxlos rsin txdisable txfault txdisable txfault rxlos rsout vbias vmod- vmod vild- vild+ gndd vddd rsin data comp shdn vdda gnda vmpd clk vin xpn vrx nc fb figure 2. transmitter from sheet 1 to sheet 1 j5 j4 rosa1 j6 v cc _r c6 0.1 f c5 0.1 f r30 270 ? d5 d3 d1 d4 d2 d7 d6 r39 270 ? r31 270 ? r38 270 ? r37 270 ? r44 270 ? r42 270 ? c4 0.1 f c3 0.1 f c2 0.1 f c1 0.1 f c23 0.1 f c22 0.1 f c21 0.1 f c20 0.1 f c25 0.1 f c18 0.1 f c17 0.1 f c16 0.1 f c15 0.1 f c14 0.1 f q1 l4 l3 c34 1 f c31 10 f c30 10 f c29 10 f c24 tbd r29 tbd r28 tbd r43 tbd r41 tbd ina138 u5 u4 sy88973 v cc _r u6 74lcx04 rsout rsin rxlos txdisable txfault shdn tp5 tp4 tp3 vrx +5v +3.3v v cc _r v cc _r v cc _r v cc _r v cc _r v cc _t tp1 tp2 v cc _r v cc _t v cc _t v cc _t v cc _t v cc _t v cc _t v cc _t gnd vcc /o0 /o1 /o2 /o5 /o4 /o3 a0 a1 a2 a5 a4 a3 11 13 14 10 12 7 1 3 5 9 2 4 6 8 v cc _r v cc _r q2 r40 5.11k 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 9 vin+ vin gnd out v+ 1 2 3 5 4 r47 0 ? 1 2 3 4 5 loslvl /dout /din dout gnd gnd din vcc vcc cap /en los vcc vcc gnd gnd figure 3. receiver
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 7 pcb layout/assembly
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 8 bill of materials common anode vcsel driven differentially item part number manufacturer description qty. c19 vishay (1) 0.1 f, 0402, ceramic capacitor 1 c1-c18,c20-c22, c24-27, c32, c33, c35-39, vishay (1) 0.1 f, 0402, ceramic capacitor 39 c28, c34 vishay (1) 1 f, 0603, ceramic capacitor 2 c29-c31 ecsh0gy106r vishay (1) 10 f, y, tantalium solid electrolytic capacitor 3 d1-7 67-1636-1-nd digi-key (2) led 7 j1 745783 amp (3) receptacle db-25 r/a connector, 25 position 1 j2-5 142-0711-821 johnson components (4) sma end launch receptacle connector 4 j6 d12m-9060-4 luxnet (5) rosa 1 j8 4190-521 honeywell (6) vcsel 1 l1-2 blm18hg102sn murata (7) inductor 2 l3-4 imc 0805 rk 122 j 01 vishay (1) 1.2 h ferrite bead inductor 2 q1, q5 mmbt3904 fairchild semiconductor (8) general purpose npn transistor (sot-23) 2 q3-4 mmbt3906 fairchild semiconductor (8) general purpose pnp transistor (sot-23) 2 r13, r16, r19, r27, r36, r48 crcw04020r00f vishay (1) 0 resistor 6 r15 crcw04023r32f vishay (1) 3.32 , 1% resistor 1 r8-9 crcw040210r0f vishay (1) 10 , 1% resistor 2 r7, r26 crcw040249r9f vishay (1) 49.9 , 1% resistor 2 r10, r12 crcw04021270f vishay (1) 50 , 1% resistor 2 r2-3, r30-31, r37-39, r42, r44 crcw04022740f vishay (1) 274 , 5% resistor 8 r18 crcw04024751f vishay (1) 4.75k , 5% resistor 1 r1, r5-6, r11, r20-21, r23, r33-34, r41 crcw04021002f vishay (1) 10k , 5% resistor 11 r17 crcw04024752f vishay (1) 47k , 5% resistor 1 tp3 5010 keystone (9) color coded pcb test point 1 tp5 5011 keystone (9) color coded pcb test point 1 u1 mic74 micrel (10) 2-wire serial i/o expander 1 u2 mic3001 micrel (10) optical transceiver management ic 1 u3 sy89307 micrel (10) vcsel driver 1 u4 sy88973 micrel (10) 3.2gbps limiting post amplifier 1 u5 ina138 ti(burr-brown) (11) high side measurement current shunt monitor 1 u6 74lcx04 fairchild (8) low voltage hex inverter with 5v tolerant inputs 1 txrx_307_r0 micrel (10) bare pcb 1
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 9 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.honeywell.com/sensing/vcsel 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
micrel txrx_307_r0 evaluation board september 2004 m9999-092304 hbwhelp@micrel.com or (408) 955-1690 10 micrel cross reference to find an equivalent micrel part, go to micrel?s website at: http://www.micrel.com and follow the steps below: 1. click on dynamic cross reference. 2. enter competitor?s part number in the dynamic cross reference field. 3. to download a pdf version of this information, click on the cross reference pdf tab. application hints and notes 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 ?product info?. 2. in the applications information box, choose ?application hints and application notes.? hbw support hotline: 408-955-1690 email support: hbwhelp@micrel.com 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 a ssumed 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 malfu nction 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 resul t 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 pu rchaser?s own ris k and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2004 micrel, incorporated.
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