5V/3.3V 2.5Gbps LASER DIODE DRIVER Micrel, Inc. DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ Up to 2.5Gbps operation 30mA modulation current Separate modulation control Separate output enable for laser safety Differential inputs for data 75KΩ input pull-down resistor 3.3V and 5V power supply options Available in a tiny 10-pin (3mm × 3mm) MSOP The SY88922V 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 when output enable is HIGH. The device incorporates complementary open collector outputs with a capability of driving peak current of 30mA. The resistor REXT must be placed between /OUT and V CC to dissipate the worst case power. R SER is recommended to compensate for laser diode matching issues. Pin 9 and pin 10 should be connected to achieve better performance. The SY88922V utilizes the high-performance bipolar ASSET™ technology. All support documentation can be found on Micrel’s web site at www.micrel.com. APPLICATIONS ■ ■ ■ ■ ■ ■ SY88922V SY88922V 1.25Gbps and 2.5Gpbs Gigabit Ethernet 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel 622Mbps SONET Gigabit Interface Converter 2.5Gbps SDH/SONET 2.5Gbps Proprietary Links BLOCK DIAGRAM VCC REXT /OUT OUT RSER DIN Internal Logic /DIN IMOD /EN BIAS Control to Laser Diode 40X VCC GND Modulation Control GND RSET VREF RSET ASSET is a trademark of Micrel, Inc. M9999-082205 [email protected] or (408) 955-1690 Rev.: E 1 Amendment: /0 Issue Date: August 2005 Micrel, Inc. SY88922V PACKAGE/ORDERING INFORMATION Ordering Information(1) /EN 1 10 OUT DIN 2 9 OUT /DIN 3 8 /OUT VREF 4 7 GND RSET 5 6 VCC Part Number Package Type Operating Range Package Marking Lead Finish SY88922VKC K10-1 Commercial SY88922V Sn-Pb SY88922VKCTR(2) K10-1 Commercial SY88922V Sn-Pb SY88922VKG K10-1 Industrial SY88922V with Pb-Free bar-line indicator Pb-Free NiPdAu SY88922VKGTR(2) K10-1 Industrial SY88922V with Pb-Free bar-line indicator Pb-Free NiPdAu 10-Pin MSOP (K10-1) Notes: 1. Contact factory for die availability. Die is guaranteed at TA = 25°C, DC electricals only. 2. Tape and Reel. PIN DESCRIPTION Pin Number Pin Name Pin Function 1 /EN 2, 3 DIN, /DIN 4 VREF Voltage reference for use with RSET. 5 RSET An external resistor sets up the source current for modulation IMOD. 6 VCC Most positive power supply input. 7 GND Ground. 8, 9, 10 /OUT, OUT Enable. This PECL 100k compatible input enables Laser Driver. Modulation current goes to zero when asserted HIGH. Differential PECL 100k compatible inputs which receive NRZ data. Open collector outputs from the modulation buffer drive these differential current outputs. TRUTH TABLE(1) D /D /EN OUT (2) /OUT L H L H L H L L L H X X H H L Notes: 1. L = LOW, H = HIGH, X = don't care. 2. H = IOUT = 0mA. M9999-082205 [email protected] or (408) 955-1690 2 Micrel, Inc. SY88922V Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VCC) ..................................... +0V to +7.0V Input Voltage (VIN) .................................................0 to VCC Output Current (VOUT) ............................................... 30mA Power Dissipation (PD) ........................................... 250mW Lead Temperature (soldering, 20 sec.) ..................... 260°C Storage Temperature (TS) ....................... –55°C to +125°C Supply Voltage (VCC) .............................. +4.5V to +5.5V or ............................................................ +3.0V to +3.6V Ambient Temperature (TA) ......................... –40°C to +85°C Capacitance on OUT + /OUT (COUT) ................ 2.5pF (typ.) Resistor to Dissipate Power (REXT) .................... 10 to 50Ω Laser Diode Serial Resistor (RSER) ...................... 0 to 50Ω Resistor to Adjust Current (RSET)(4) ............... 700 to 20,000Ω Package Thermal Resistance(3) MSOP (θJA) Still-air ........................................... 113°C/W MSOP (ΨJB) ........................................................ 74°C/W DC ELECTRICAL CHARACTERISTICS GND = 0V; VCC = +5.0V ±10% or VCC = +3.3V ±10%; TA = –40°C to +85°C; unless noted. Symbol Parameter Condition Min VIH Input HIGH Voltage (DIN, /DIN, /EN) VIL Input LOW Voltage (DIN, /DIN, /EN) VREF Reference Voltage 1.7 IIL Input LOW Current (DIN, /DIN, /EN)(5) 0.5 IIH Input HIGH Current (DIN, /DIN, /EN) Typ Max Units VCC –1165 VCC –880 mV VCC –1810 VCC –1475 mV 2.3 V 2.0 µA Current(6) ICC Supply IOL Output LOW Current (/EN = HIGH) IOUT Modulation Current IRSET Modulation Control ARSET =IOUT /IRSET 450 0.125 30 38 100 µA 25 mA 1000 µA 30 mA 0.625 mA 44 — Notes: 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 Ratings conditions for extended periods may affect device reliability. 2. The voltage drop across REXT and RSER plus Laser Diode should not be greater than 1V. 3. Still-air without heatsink. 4. RSET minimum 430Ω. 5. VIN = VIL (min). 6. IMOD = 25mA. M9999-082205 [email protected] or (408) 955-1690 3 Micrel, Inc. SY88922V AC ELECTRICAL CHARACTERISTICS(7) IMOD =10mA; GND = 0V; VCC = +5V ±10% or VCC = +3.3V ±10%; TA = –40°C to +85°C; unless noted. Symbol Parameter Condition Min tpd D Propagation Delay (DIN – OUT) 400 ps tpd EN Propagation Delay (/EN – OUT) 400 ps tr, tf Rise/Fall Time(8) (20% to 80%) 74 IOR Output Current Ringing(9) DJ Deterministic Jitter(10) 7 Notes: 7. REXT = RSER = 25Ω ±1%; RSER connects to VCC directly without Laser Diode. 8. IMOD = 10mA. 9. IOH = 5 to 25mA. 10. IMOD = 10mA, 2.5Gbps, 223–1 pattern. TYPICAL CHARACTERISTICS IOUT vs. RSET 40 IOUT (µA) 30 VCC = 5.0V 20 10 0 0.0 M9999-082205 [email protected] or (408) 955-1690 Typ VCC = 3.3V 1.0 2.0 3.0 RSET(kΩ) 4 4.0 5.0 Max Units 130 ps 10 % psrms Micrel, Inc. SY88922V 10 LEAD MSOP (K10-1) Rev. 00 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA http://www.micrel.com The information furnished by Micrel in this data sheet 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. © 2005 Micrel, Incorporated. M9999-082205 [email protected] or (408) 955-1690 5