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| LASER DIODE DRIVER WITH OUTPUT ENABLE PRELIMINARY SY100EL1003 FEATURES s s s s s s s s Up to 1.25Gbps operation 75mA peak drive current Separate modulation control Separate output enable for laser safety Differential inputs for data 75K input pulldown resistor Single power supply Available in 16-pin SOIC package DESCRIPTION The SY100EL1003 is a high speed current source for driving a semiconductor laser diode in optical transmission applications. The output current modulation is DC - voltage controlled. The modulation current is disabled when output enable is HIGH. The device incorporates complementary open collector outputs with a capability of driving peak current of 75mA. The laser driver current is adjustable by selection of RSET. The resistor REXT must be placed between OUT and VCC to dissipate the worst case power. RSER is recommended to fix laser diode matching issues. The SY100EL1003 utilizes the high performance bipolar ASSET technology. PIN CONFIGURATION NC 1 EN 2 N/C 3 RSET 4 VCCO 5 D6 D7 NC 8 16 15 14 VCC NC MC OUT OUT VBB NC VEE Top View SOIC Z16-2 13 12 11 10 9 BLOCK DIAGRAM VCC REXT VBB OUT OUT RSER D D Internal Logic to Laser Diode EN BIAS Control Modulation Control MC RSET VEE Rev.: D Amendment: /0 RSET 1 Issue Date: August, 1998 Micrel PRELIMINARY SY100EL1003 PIN NAMES Pin VCC, VCCO Function Separate positive power supply pins help to isolate sensitive circuitry from noise generating function. +5V for PECL operation or ground for ECL operation. Most negative power supply input. Ground for PECL operation or -5V for ECL operation. This pin provides a reference voltage for use in single ended applications or when the input signal is AC coupled into the device. These differential ECL/PECL 100K compatible inputs receive NRZ data. This ECL/PECL 100K compatible input enables Laser Driver - modulation current transitions to zero when asserted HIGH. Open collector outputs from the modulation buffer drive these differential current outputs. An external voltage sets the main value of modulation current IO. An external resistor sets the source current for modulation Imod. These pins are not connected. TRUTH TABLE(1) D L H X D H L X EN L L H OUT H L H OUT L H L VEE VBB NOTE: 1. L = LOW, H = HIGH, X = don't care D,D EN OUT, OUT MC RSET NC ABSOLUTE MAXIMUM RATINGS(1) Symbol VEE VI IO TA Ptot Rating Power Supply Voltage (VCC = 0V) Input Voltage (VCC = 0V) Output Current Operating Temperature Range Power Dissipation Value 0 to -7.0 0 to -6.0 75 -40 to +85 500 Unit V V mA 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 VEE RSET REXT RSER Power Supply Voltage Resistor to Adjust Current Resistor to Dissipate Power Laser Diode Serial Resistor Rating Value -4.75 to -5.25 10 to 100 10 to 50 0 to 50 Unit V NOTE: 1. The voltage drop across REXT and RSER should not be greater than 2V. 2 Micrel PRELIMINARY SY100EL1003 DC ELECTRICAL CHARACTERISTICS(1) VCC = VCCO = 0V; VEE = -5.0V 5% TA = -40C Symbol VIH VIL VImod VBB IIH IImod IIL ICC IOH IOL IOR IOmod Parameter Input HIGH Voltage (D, EN) Input LOW Voltage (D, EN) Input Voltage (Modulation Control) Output Reference Voltage Input HIGH Current (D, EN) Input Current (Modulation Control) Input LOW Current(2) (D, EN) Supply Current(3) Output HIGH (EN LOW)(5) Current(4) Min. -1165 -1810 VEE -1380 -- -- 0.5 8 60 -- -- 5 Typ. -- -- -- -- -- -- -- 14 64 -- -- -- -- Max. -880 -1475 VCC -1260 150 150 -- 25 68 -- 500 10 60 TA = 0C Min. -1165 -1810 VEE -1380 -- -- 0.5 8 60 5 -- -- 5 Typ. -- -- -- -- -- -- -- 14 64 -- -- -- -- Max. -880 TA = +25C Min. -1165 Typ. Max. -- -- -- -- -- -- -- 14 64 -- -- -- -- -880 TA = +85C Min. -1165 Typ. Max. Unit -- -- -- -- -- -- -- 14 64 -- -- -- -- -880 mV -1475 -1810 VCC VEE -1475 -1810 VCC VEE -1475 mV VCC V -1260 -1380 150 150 -- 25 68 -- 500 10 60 -- -- 0.5 8 60 5 -- -- 5 -1260 -1380 150 150 -- 25 68 -- 500 10 60 -- -- 0.5 8 60 5 -- -- 5 -1260 mV 150 150 -- 25 68 -- 500 10 60 A A A mA mA 5 A % mA Output LOW Current (EN HIGH) Output Current Ringing(6) Laser Diode Modulation Current Range NOTES: 1. RSET = 10 1% 2. VI = VIL(Min.) 3. VImod = VCC 4. VImod = -3.5V 5. VLmod = -0.8V 6. IOH = 5 to 60mA AC ELECTRICAL CHARACTERISTICS(1) VImod = -1.5V; VCC = VCCO = 0V; VEE = -5V 5% TA = -40C Symbol tpd D tpd EN tr tf Parameter Propagation Delay D - OUT Propogation Delay EN - OUT Rise/Fall Time (20% to 80%) Min. -- -- -- Typ. -- -- -- Max. 1000 1000 400 Min. -- -- -- TA = 0C Typ. -- -- -- Max. 1000 1000 400 -- -- -- TA = +25C Min. Typ. -- -- -- Max. 1000 1000 400 -- -- -- TA = +85C Min. Typ. Max. Unit -- -- -- 1000 1000 400 ps ps ps NOTE: 1. RSET = 10 1%, REXT = RSER = 50 1% 3 Micrel PRELIMINARY SY100EL1003 PERFORMANCE CURVES IO vs. TA and Vmod 70 IO (mA) 60 50 40 30 20 10 0 0 TA = 0C TA = 25C TA = 70C 1.0 2.0 3.0 4.0 5.0 -Vmod (V) PRODUCT ORDERING CODE Ordering Code SY100EL1003ZC SY100EL1003ZCTR Package Type Z16-2 Z16-2 Operating Range Commercial Commercial 4 PRELIMINARY SY100EL1003 LASER MODULE REXT 82 VCC VCC VCCO OUT VCC 50 COAX D OUT D INPUTS 50 COAX RSER SY100EL1003 VCC VEE 0.1F 0.1H 50 COAX EN A MC RSET RSET VEE B VEE 130 LASER BIAS / APC CONTROL 10k 10 470k 0.1F 0.1F 1k 1k - - IC VEE VCC VEE 0.1F 0.02F IC 4.7k 1 + VCC VCC VCC 750 24 2 + 47k 47k 47k 10k 1k 10k APPLICATION EXAMPLE IC = IC = LM324 1 2 VEE VEE = -5.0V VCC = 0V Micrel NOTES: 1. Split 100K ECL terminations are 82 and 130 to VCC and VEE respectively. 2. Recommended power supply bypass capacitors are 0.1F with optional 10F Tantalum in parallel. 3. It is required to use high frequency design techniques for board layout. A double sided or multilayer board is recommended in conjunction with a low impedance ground plane and properly terminated transmission lines for all signal paths. 4. VBB voltage pin may be used as reference for single ended input applications. 5 Micrel PRELIMINARY SY100EL1003 16 LEAD SOIC .150" WIDE (Z16-2) Rev. 02 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 6 |
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