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| SDH/SONET 2.5Gbps LASER DIODE DRIVER SY88922 FEATURES s s s s s s s s Up to 2.5Gbps operation 25mA peak drive current Separate modulation control Separate output enable for laser safety Differential inputs for data 75K input pulldown resistor Designed for use with SY88923, SY88904 or SY88905 Available in a tiny 10-pin (3mm) MSOP DESCRIPTION The SY88922 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 SY88922 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 GND 6 GND APPLICATIONS s s s s s 1.25Gbps Gigabit Ethernet 531Mbps and 1062Mbps Fibre Channel 622Mbps SONET Gigabit Interface Converter 2.5Gb/s SDH/SONET BLOCK DIAGRAM VCC REXT OUT OUT RSER DIN DIN IMOD EN BIAS Control Internal Logic to Laser Diode 40X VCC GND GND RSET Modulation Control VREF RSET Rev.: B Amendment: /1 1 Issue Date: July 2000 Micrel SY88922 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 = 0mA 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 50,000 113 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 SY88922 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. Min. 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-880 VCC-1165 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. -- -- -- -- Max. 1000 1000 160 10 Min. -- -- -- -- TA = +25C Typ. 500 450 110 -- Max. 1000 1000 160 10 Min. -- -- -- -- TA = +85C Typ. -- -- -- -- Max. 1000 1000 160 10 Unit ps ps ps % Load = 25 Conditions NOTES: 1. REXT = RSER = 25 1%, RSER connects to VCC directly without Laser Diode. 2. IOH = 5 to 25mA 3 Micrel SY88922 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 SY88922KC SY88922KCTR Package Type K10-1 K10-1 Operating Range Commercial Commercial 4 SY88922 20k 68 68 VREF OUT DIN DIN RSET TX_DATA+ SY88922 EN 200 200 TX_DATA- OUT REXT 24 RSER BLM21A102S Laser Module ENABLE/DISABLE VCC GND VCC APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION GBIC Terminal IBIAS MD IBIAS SET 20k The value of RSER depends on the Laser Diode. SY88905 LOSOUT LOSIN RX_LOS IBIAS FB IPIN SET 20k 1000pF VCC Photodiode Laserdiode VCC VCC VCC 82 82 GND VREF VCC 82 DIN DOUT DOUT RX_DATA+ RX_DATA- 130 130 130 LOSLVL 0.1F VCC 0.1F VCC GND VREF Micrel 20k 130 SY88923 DIN 82 EN LOS 5 Micrel SY88922 10 LEAD MSOP (K10-1) Rev. 00 6 Micrel SY88922 7 Micrel SY88922 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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