LASER DIODE DRIVER WITH OUTPUT ENABLE DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ Up to 1.25Gbps operation 75mA peak drive current Separate modulation control Separate output enable for laser safety Differential inputs for data 75KΩ input pulldown resistor Single power supply Available in 16-pin SOIC package 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 V CC to dissipate the worst case power. R SER is recommended to fix laser diode matching issues. The SY100EL1003 utilizes the high performance bipolar ASSET technology. PIN CONFIGURATION NC 1 16 V CC EN 2 15 NC N/C 3 14 MC 13 OUT 12 OUT D 6 11 V BB D 7 10 NC 9 V EE RSET 4 V CCO 5 PRELIMINARY SY100EL1003 Top View SOIC Z16-2 NC 8 BLOCK DIAGRAM VCC REXT VBB OUT OUT RSER D Internal Logic D EN to Laser Diode BIAS Control Modulation Control RSET MC RSET VEE Rev.: D 1 Amendment: /0 Issue Date: August, 1998 PRELIMINARY SY100EL1003 Micrel TRUTH TABLE(1) PIN NAMES Function D D EN OUT OUT Separate positive power supply pins help to isolate sensitive circuitry from noise generating function. +5V for PECL operation or ground for ECL operation. L H L H L H L L L H X X H H L Pin VCC, VCCO VEE Most negative power supply input. Ground for PECL operation or -5V for ECL operation. VBB This pin provides a reference voltage for use in single ended applications or when the input signal is AC coupled into the device. D,D These differential ECL/PECL 100K compatible inputs receive NRZ data. EN This ECL/PECL 100K compatible input enables Laser Driver - modulation current transitions to zero when asserted HIGH. OUT, OUT Open collector outputs from the modulation buffer drive these differential current outputs. MC An external voltage sets the main value of modulation current IO. RSET An external resistor sets the source current for modulation Imod. NC These pins are not connected. NOTE: 1. L = LOW, H = HIGH, X = don't care ABSOLUTE MAXIMUM RATINGS(1) Symbol Rating Value Unit VEE Power Supply Voltage (VCC = 0V) 0 to -7.0 V VI Input Voltage (VCC = 0V) 0 to -6.0 V IO Output Current 75 mA TA Operating Temperature Range –40 to +85° °C Ptot Power Dissipation 500 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 Rating Value Unit –4.75 to -5.25 V Resistor to Adjust Current 10 to 100 Ω REXT Resistor to Dissipate Power 10 to 50 Ω RSER Laser Diode Serial Resistor 0 to 50 Ω VEE Power Supply Voltage RSET NOTE: 1. The voltage drop across REXT and RSER should not be greater than 2V. 2 PRELIMINARY SY100EL1003 Micrel DC ELECTRICAL CHARACTERISTICS(1) VCC = VCCO = 0V; VEE = -5.0V ± 5% TA = –40°C Symbol Parameter TA = 0°C TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. VIH Input HIGH Voltage (D, EN) -1165 — -880 -1165 — -880 -1165 — -880 -1165 — -880 VIL Input LOW Voltage (D, EN) -1810 — -1475 -1810 — -1475 -1810 — -1475 -1810 — -1475 mV VImod Input Voltage (Modulation Control) VEE — VCC VEE — VBB Output Reference Voltage -1380 — -1260 -1380 — IIH Input HIGH Current (D, EN) — — 150 — — 150 — — 150 — — 150 µA IImod Input Current (Modulation Control) — — 150 — — 150 — — 150 — — 150 µA IIL Input LOW Current(2) (D, EN) 0.5 — — 0.5 — — 0.5 — — 0.5 — — µA ICC Supply Current(3) 8 14 25 8 14 25 8 14 25 8 14 25 mA 60 64 — 68 — 60 5 64 — 68 — 60 5 64 — 68 — 60 5 64 — 68 — mA 5 Current(4) VCC VEE -1260 -1380 Typ. Max. — — VCC Min. VEE -1260 -1380 Typ. Max. Unit — — VCC mV V -1260 mV IOH Output HIGH (EN LOW)(5) IOL Output LOW Current (EN HIGH) — — 500 — — 500 — — 500 — — 500 µA IOR Output Current Ringing(6) — — 10 — — 10 — — 10 — — 10 % IOmod Laser Diode Modulation Current Range 5 — 60 5 — 60 5 — 60 5 — 60 mA NOTES: 1. RSET = 10Ω ± 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 = –40°C Symbol Parameter TA = 0°C TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit tpd D Propagation Delay D - OUT — — 1000 — — 1000 — — 1000 — — 1000 ps tpd EN Propogation Delay EN - OUT — — 1000 — — 1000 — — 1000 — — 1000 ps tr tf Rise/Fall Time (20% to 80%) — — 400 — — 400 — — 400 — — 400 ps NOTE: 1. RSET = 10Ω ± 1%, REXT = RSER = 50Ω ± 1% 3 PRELIMINARY SY100EL1003 Micrel PERFORMANCE CURVES IO vs. TA and Vmod IO (mA) 70 TA = 0˚C TA = 25˚C TA = 70˚C 60 50 40 30 20 10 0 0 1.0 2.0 3.0 4.0 5.0 -Vmod (V) PRODUCT ORDERING CODE Ordering Code Package Type Operating Range SY100EL1003ZC Z16-2 Commercial SY100EL1003ZCTR Z16-2 Commercial 4 PRELIMINARY SY100EL1003 Micrel APPLICATION EXAMPLE D 82Ω 50Ω COAX EN D 50Ω COAX 130Ω VEE VCCO VEE VCC RSET RSET SY100EL1003 VCC 0.1µF VCC MC REXT OUT OUT VCC 10k VEE A 1kΩ VCC 1kΩ 750Ω 0.02µF VCC VCC + – 0.1µF 470kΩ 2 IC 47kΩ 10k VEE 47kΩ 4.7kΩ IC 1 – + 1kΩ 10kΩ 47kΩ LASER BIAS / APC CONTROL 0.1µH LASER MODULE RSER VEE 0.1µF 10Ω 0.1µF 24Ω 2 B 5 50Ω COAX VEE VCC 1 IC = IC = LM324 VEE = –5.0V VCC = 0V NOTES: 1. Split 100K ECL terminations are 82Ω and 130Ω to VCC and VEE respectively. 2. Recommended power supply bypass capacitors are 0.1µF with optional 10µF 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. INPUTS PRELIMINARY SY100EL1003 Micrel 16 LEAD SOIC .150" WIDE (Z16-2) Rev. 02 MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA + 1 (408) 980-9191 FAX + 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. © 2000 Micrel Incorporated 6