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| LASER DIODE DRIVER WITH INPUT D FLIP-FLOP PRELIMINARY SY100EL1001 FEATURES s s s s s s s s Up to 1.25Gb/s operation 75mA peak drive current Separate modulation control Separate master reset for laser safety Differential inputs for data and clock 75K input pulldown resistor Single power supply Available in 16-pin SOIC package DESCRIPTION The SY100EL1001 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 integrated circuit contains the following functional blocks: * * * * Input Line Receiver D Flip-Flop Bias Control Circuitry Output Current Switch PIN CONFIGURATION NC CLK CLK RSET VCCO D D MR 1 2 3 4 5 6 7 8 16 15 14 VCC NC MC OUT OUT VBB NC VEE Top View SOIC Z16-2 13 12 11 10 9 A logic HIGH level at the data input results in the modulation current flowing through the OUT pin on the next rising edge of the clock. A logic HIGH level at the master reset input will disable the modulation current. The device incorporates complementary open collector outputs with a capability of driving peak current of 75 mA. 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 SY100EL1001 utilizes the high performance bipolar ASSET technology. BLOCK DIAGRAM VCC REXT VBB OUT OUT RSER D, D CLK, CLK MR D Flip-Flop to Laser Diode BIAS Control Modulation Control MC RSET VEE Rev.: E Amendment: /0 1 Issue Date: August, 1998 Micrel PRELIMINARY SY100EL1001 PIN NAMES Pin VCC, VCCO Function Most positive power supply pins separation helps 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. These differential clock inputs This ECL/PECL 100K compatible input resets the Laser Driver Logic - 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 CLK Z Z X CLK ZZ ZZ X MR L L H OUT H L H OUT L H L VEE VBB NOTE: 1. L = LOW, H = HIGH, Z = LOW-to-HIGH transition, ZZ = HIGH-to-LOW transition, X = don't care. D,D CLK, CLK MR OUT, OUT MC RSET NC ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC VIN 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 SY100EL1001 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, CLK, MR) Input LOW Voltage (D, CLK, MR) Input Voltage (Modulation Control) Output Reference Voltage Input HIGH Current (D, CLK, MR) Input Current (Modulation Control) Input LOW Current(2) (D, CLK, MR) Supply Current(3) Output HIGH Current(4) (MR LOW)(5) Output LOW Current (MR HIGH) Output Current Ringing(6) Laser Diode Modulation Current Range 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 Min. -1165 -1810 VEE -1380 -- -- 0.5 8 60 5 -- -- 5 TA = 0C Typ. -- -- -- -- -- -- -- 14 64 -- -- -- -- Max. -880 -1475 VCC -1260 150 150 -- 25 68 -- 500 10 60 TA = +25C Min. -1165 -1810 VEE -1380 -- -- 0.5 8 60 5 -- -- 5 Typ. Max. -- -- -- -- -- -- -- 14 64 -- -- -- -- -880 TA = +85C Min. -1165 Typ. -- -- -- -- -- -- -- 14 64 -- -- -- -- Max. Unit -880 mV -1475 -1810 VCC VEE -1475 mV VCC V -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 NOTE: 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) TA = -40C Symbol tpd CLK tpd MR tr tf tS tH tPW Parameter Propagation Delay CLK - OUT Propogation Delay MR - OUT Rise/Fall Time (20% to 80%) Set-up Time Hold Time Minimum Pulse Width (CLK, MR) Min. -- -- -- 100 500 400 Typ. -- -- -- -- -- -- Max. 1000 1000 400 -- -- -- Min. -- -- -- 100 500 400 TA = 0C Typ. -- -- -- -- -- -- Max. 1000 1000 400 -- -- -- TA = +25C Min. -- -- -- 100 500 400 Typ. -- -- -- -- -- -- Max. 1000 1000 400 -- -- -- Min. -- -- -- 100 500 400 TA = +85C Typ. Max. -- -- -- -- -- -- 1000 1000 400 -- -- -- Unit ps ps ps ps ps ps NOTE: 1. RSET = 10 1%, REXT = RSER = 50 1% 3 Micrel PRELIMINARY SY100EL1001 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 SY100EL1001ZC SY100EL1001ZCTR Package Type Z16-2 Z16-2 Operating Range Commercial Commercial 4 PRELIMINARY SY100EL1001 LASER MODULE REXT 82 VCC VCC VCCO OUT OUT RSER VCC 50 COAX D D CLK 50 COAX INPUTS 50 COAX 50 COAX SY100EL1001 CLK MR VEE RSET RSET VEE VCC 500 0.1H 50 COAX A MC 10k B LASER BIAS / APC CONTROL 10 470k 0.1F 0.1F 1k 1k - - IC VEE VCC VEE 0.1F 0.02F IC 4.7k 1 + VCC VCC VCC 24 750 2 + 47k 47k 47k 10k 1k APPLICATION EXAMPLE 10k 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. High frequency design techniques are required 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. 5 130 Micrel PRELIMINARY SY100EL1001 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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