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| LASER DIODE DRIVER WTIH OUTPUT ENABLE FEATURES s s s s s s s s s Up to 1.25Gbps operation 25mA peak drive current Separate modulation control Separate output enable for laser safety Differential inputs for data 75K input pulldown resistor Single power supply Designed for use with SY88903 and SY88904 Available in a tiny 10-pin (3mm) MSOP SY88902 DESCRIPTION The SY88902 is a high speed current switch for driving a semiconductor laser diode in optical transmission applications. The output current, or modulation current IMOD, is DC current controlled by IRSET, current through the resistor RSET. The output OUT is HIGH when output enable is HIGH. The device incorporates complementary open collector outputs with a capability of driving peak current of 25mA. The resistor REXT must be placed between /OUT and VCC to dissipate the worst case power. RSER is recommended to compensate for laser diode matching issues. The SY88902 utilizes the high performance bipolar ASSETTM technology. PIN CONFIGURATIONS /EN 1 DIN 2 /DIN 3 VREF 4 RSET 5 MSOP K10-1 10 VCC 9 OUT 8 /OUT 7 6 GND GND APPLICATIONS s s s s 1.25Gbps Gigabit Ethernet 531Mbps and 1062Mbps Fibre Channel 622Mbps SONET Gigabit Interface Converter BLOCK DIAGRAM VCC REXT OUT OUT RSER DIN DIN IMOD EN BIAS Control Internal Logic to Laser Diode 40X VCC GND VEE Modulation Control RSET VREF RSET Rev.: C Amendment: /1 1 Issue Date: July 2000 Micrel SY88902 PIN NAMES Pin VCC GND DIN, /DIN /EN Function Most positive power supply input, +5V for PECL operation. Ground These differential PECL 100K compatible inputs receive NRZ data. This PECL 100K compatible input enables Laser Driver. Modulation current goes to zero when asserted HIGH. Open collector outputs from the modulation buffer drive these differential current outputs. Voltage reference for use with RSET. An external resistor sets up the source current for modulation Imod. TRUTH TABLE(1) D L H X D H L X /EN L L H OUT (2) H L H /OUT L H L NOTES: 1. L = LOW, H = HIGH, X = don't care 2. H = IOUT = OmA OUT, /OUT VREF RSET ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC VI IO TA Tstore Ptot Power Supply Voltage Input Voltage Output Current Operating Temperature Range Storage Temperature Range Power Dissipation Rating Value 0 to +7.0 0 to VCC 25 0 to +85 -55 to +125 250 Unit V V mA C C mW NOTE: 1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended periods may affect device reliability. OPERATIONING CONDITIONS(1) Symbol VCC REXT RSER RSET JA COUT Power Supply Voltage Resistor to Dissipate Power Laser Diode Serial Resistor Resistor to Adjust Current Thermal Resistance of Package to Capacitance on OUT + /OUT Ambient(2) Rating Value +4.5 to +5.5 10 to 50 0 to 50 1500 to 50,000 206 2.5 typical Unit V C/W pf NOTES: 1. The voltage drop across REXT and RSER plus Laser Diode should not be greater than 2V. 2. Still air without heatsink. 2 Micrel SY88902 DC ELECTRICAL CHARACTERISTICS GND = 0V; VCC = +5.0V 10%; TA = 0C to + 85C TA = 0C Symbol VIH VIL VREF IIL IIH ICC IOL IOUT IRSET ARSET Parameter Input HIGH Voltage (DIN, /DIN, /EN) Input LOW Voltage (DIN, /DIN, /EN) Reference Voltage Input LOW (DIN, /DIN, /EN) Current(1) Min. VCC-1165 VCC-1810 -- 0.5 -- -- -- 5 0.125 30 Typ. -- -- 3.12 -- -- 16 -- 15 -- 38 Max. VCC-880 Min. VCC-1165 TA = +25C Typ. -- -- 3.00 -- -- 16 -- 15 -- 38 Max. VCC-880 Min. VCC-1165 TA = +85C Typ. -- -- 2.80 -- -- 16 -- 15 -- 38 Max. VCC-880 VCC-1475 -- -- 100 25 500 25 0.625 44 Unit mV mV V uA uA mA uA mA mA -- VCC-1475 VCC-1810 -- -- 100 25 500 25 0.625 44 -- 0.5 -- -- -- 5 0.125 30 VCC-1475 VCC-1810 -- -- 100 25 500 25 0.625 44 -- 0.5 -- -- -- 5 0.125 30 Input HIGH Current (DIN, /DIN, /EN) Supply Current(2) Output LOW Current (/EN = HIGH) Modulation Current Modulation Control =IOUT/IRSET NOTES: 1. VI = VIL(Min.) 2. IMOD = 25mA. AC ELECTRICAL CHARACTERISTICS(1) IMOD =10mA; GND = 0V; VCC = +5V 10%; TA = 0C to + 85C TA = 0C Symbol tpd D tpd EN tr tf IOR Parameter Propagation Delay DIN - OUT Propagation Delay /EN - OUT Rise/Fall Time (20% to 80%) Output Current Ringing(2) Min. -- -- -- -- Typ. -- -- 200 -- Max. 1000 1000 -- 10 Min. -- -- -- -- TA = +25C Typ. 500 450 200 -- Max. 1000 1000 -- 10 Min. -- -- -- -- TA = +85C Typ. -- -- 200 -- Max. 1000 1000 -- 10 Unit ps ps ps % Conditions IMOD = 10mA IMOD = 10mA NOTES: 1. REXT = RSER = 50 1%, RSER connects to VCC directly without Laser Diode. 2. IOH = 5 to 25mA 3 SY88902 VCC VCC VCC OUT +TX_DAT -TX_DATA GND REXT Laser Module DIN DIN SY88902 RSET VREF EN OUT RSER IBIAS SET VREF VCC GND GBIC Terminal TX_Out TX_FAULT TX_FAULT TX_DISABLE TX_DISABLE IBIAS MD PECL OC IBIAS SET VCC APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION IBIAS FB SY88904 LOSOUT VCCDET ILIMIT SET PECL LOS IPIN SET RX_LOS RWIN VREF VCC EN LOS 2meg ILIMIT SET DOUT DOUT DIN VREF 0.1f +RX_DAT -RX_DAT SY88903 LOSLVL VCC GND DIN VREF VCC Micrel 4 SY88902 VCC VCC VCC OUT +TX_DAT -TX_DATA VEE REXT Laser Module Gigabit EthernetTerminal DIN DIN SY88902 RSET VREF EN OUT RSER IBIAS SET VREF VCC IBIAS MD APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION IBIAS SET VBIAS SET SY88905 LOSOUT PECL LOSIN VREF EN LOS IPIN SET VPIN SET GND RX_LOS +RX_DAT -RX_DAT DOUT DOUT DIN VREF SY88903 DIN VBB VLVL VCC VEE VCC Micrel 5 IBIAS FB Micrel SY88902 PERFORMANCE CURVES IO and RSET 30 25 20 IO (mA) 15 10 5 0.0 0.0 2.0K 4.0K 6.0K RSET (ohm) 8.0K 10K 12K PRODUCT ORDERING CODE Ordering Code SY88902KC SY88902KCTR Package Type K10-1 K10-1 Operating Range Commercial Commercial 6 Micrel SY88902 10 LEAD MSOP (K10-1) Rev. 00 7 Micrel SY88902 MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA FAX + 1 (408) 980-9191 + 1 (408) 914-7878 WEB http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2000 Micrel Incorporated 8 |
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