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| Micrel 5V 622Mbps LASER DIODE DRIVER WITH OUTPUT ENABLE SY88702 SY88702 FEATURES s s s s s s Up to 622Mbps operation Modulation current to 25mA PECL output enable Differential PECL inputs Single 5V power supply Available in a tiny 10-pin (3mm) MSOP DESCRIPTION The SY88702 is a high-speed current switch for driving a semiconductor laser diode in optical transmission applications. The modulation current (IOUT) is controlled by the current (IRSET) through the external resistor RSET. The output OUT is HIGH and no current flows through OUT when output enable is HIGH. The device incorporates complementary open collector outputs with 25mA maximum current driving capability. The external resistor R EXT must be placed between /OUT and VCC to dissipate the worst case power. RSER is recommended to compensate for laser diode matching issues. The SY88702 utilizes the high performance bipolar ASSETTM technology. APPLICATIONS s 622Mbps SONET FUNCTIONAL BLOCK DIAGRAM VCC REXT /OUT OUT RSER DIN /DIN Internal Logic /EN 40X VCC GND VEE VREF RSET IMOD to Laser Diode RSET ASSET is a trademark of Micrel, Inc. Rev.: B Amendment: /0 1 Issue Date: August 2003 Micrel SY88702 PACKAGE/ORDERING INFORMATION Ordering Information /EN 1 DIN 2 /DIN 3 VREF 4 RSET 5 10 VCC 9 OUT 8 /OUT 7 GND 6 GND Part Number SY88702KC SY88702KCTR* SY88702KI SY88702KITR* *Tape and Reel Package Type K10-1 K10-1 K10-1 K10-1 Operating Range Commercial Commercial Industrial Industrial Package Marking 702 702 702 702 10-Pin MSOP (K10-1) PIN DESCRIPTION Pin Number 1 2, 3 4 5 6, 7 9, 8 10 Pin Name /EN DIN, /DIN VREF RSET GND OUT, /OUT VCC Pin Function 100k PECL compatible input with 75k pull-down resistor. Modulation current goes to zero when deasserted high. Differential 100k PECL compatible input with 75k pull-down resistors. Voltage reference for use with RSET. An external resistor connected from here to VREF sets the reference current for IOUT. Device ground. Differential open collector current outputs. Positive power supply. TRUTH TABLE(1) D L H X /D H L X /EN L L H OUT (2) H L H /OUT L H L Note 1. L = LOW, H = HIGH, X = don't care. Note 2. H = IOUT = 0mA. 2 Micrel SY88702 Absolute Maximum Ratings(Note 1) Power Supply Voltage (VCC) ............................ 0V to +7.0V Input Voltage (VIN) .............................................. 0V to VCC Output Current (IOUT) ................................................. 25mA Power Dissipation (PD) ........................................... 250mW Storage Temperature Range (TS) ............ -55C to +125C Operating Ratings(Notes 2,3,4) Supply Voltage (VCC) .................................. +4.5V to +5.5V Ambient Temperature (TA), Note 5 ............ -40C to +85C Junction Temperature (TJ), Note 5 ............ -40C to 100C Resistor to Dissipate Power (REXT) .................. 10 to 50 Laser Diode Serial Resistor (RSER) .................... 0 to 50 Resistor to Adjust Current (RSET) .......... 1500 to 50,000 Package Thermal Resistance MSOP (JA) Still-Air ...................................................... 113C/W (JB) Still-Air ........................................................ 74C/W DC ELECTRICAL CHARACTERISTICS GND = 0V; VCC = 5V 10%; TA = -40C to +85C Symbol VIH VIL VREF IIL IIH ICC IOUT_OFF IOUT ARSET VOUT COUT Note 1. Parameter Input HIGH Voltage (DIN, /DIN, /EN) Input LOW Voltage (DIN, /DIN, /EN) Reference Voltage Input LOW Current (DIN, /DIN, /EN) Input HIGH Current (DIN, /DIN, /EN) Supply Current Output LOW Current (/EN = HIGH) Modulation Current IOUT/IRSET Voltage at OUT, /OUT Capacitance on OUT, /OUT Condition Min VCC-1.165 VCC-1.810 Typ Max VCC-0.880 VCC-1.475 Units V V V A 3.00 VIN = VIL(min) 0.5 100 IMOD = 25mA 16 25 500 5 30 VCC-2.3 2.5 15 38 25 44 VCC A mA A mA -- V pF 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. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is tested in a socket such that transverse airflow of 500lfpm is maintained. The voltage drop across REXT and RSER plus Laser Diode must not be greater than 2.3V. Commercial devices are guaranteed from 0C to +85C ambient temperature. Note 2. Note 3. Note 4. Note 5. 3 Micrel SY88702 AC ELECTRICAL CHARACTERISTICS(Note 1) GND = 0V; VCC = 5V 10%; TA = -40C to +85C Symbol tPHL, tPLH D tPHL, tPLH EN tr tf IOR Note 1. Parameter Propagation Delay DIN - OUT Propagation Delay /EN - OUT Rise/Fall Time (20% to 80%) Output Current Ringing Condition IOUT = 10mA IOUT = 10mA Min Typ Max 1000 1000 400 Units ps ps ps % IOUT = 5 to 25mA 10 REXT = RSER = 50 1%; RSER connected directly to VCC. TYPICAL OPERATING CHARACTERISTICS IMOD vs. RSET 30 25 20 IMOD (mA) 15 10 5 0.0 0.0 2.0K 4.0K 6.0K 8.0K 10K 12K RSET (9) 4 Micrel SY88702 10 LEAD MSOP (K10-1) Rev. 00 MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL USA + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2003 Micrel, Incorporated. 5 |
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