SY88782L 3.3V, 1.25Gbps High-Current, Low-Power Laser Driver for Datacom Telecom Applications General Description Features The SY88782L is a single supply 3.3V low power consumption, small-form factor, driver for telecom/datacom applications using FP/DFB lasers at data rates up to 1.25Gbps. The driver can deliver modulation current up to 90mA, and the high compliance voltage it offers makes the part suitable for high-current operation (with the laser AC- or DCcoupled to it.) This device is intended to be used with Micrel MIC3003 Optical Transceiver Management IC which allows for modulation and bias currents control and monitoring, automatic power Control, and temperature compensation. All support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • 2.3V minimum laser compliance voltage 48mA power supply current typical Operation up to 1.25Gbps Modulation current up to 90mA Designed for use with the MIC3003 Small form factor 3mm x 3mm QFN package Applications • Multi-rate LAN, MAN applications up to 1.25Gbps: − Ethernet, SONET OC3/12/24 and SDH STM1/4/8 • SFF, SFP Modules Markets • Telecom, Datacom ________________________________________________________________ Typical Application Laser DC-Coupled to the Driver Laser AC-Coupled to the Driver Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com January 2010 M9999-011310 [email protected] or (408) 955-1690 Micrel, Inc. SY88782L Functional Block Diagram Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish QFN-16 Industrial 782L with Pb-Free bar-line indicator NiPdAu Pb-Free QFN-16 Industrial 782L with Pb-Free bar-line indicator NiPdAu Pb-Free SY88782LMG (2) SY88782LMGTR Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = +25°C, DC Electricals only. 2. Tape and Reel. Pin Configuration 16-Pin QFN January 2010 2 M9999-011310 [email protected] or (408) 955-1690 Micrel, Inc. SY88782L Pin Description Pin Name Pin Number Pin Function 1, 4, 7, 8, 13 GND Ground. Ground and exposed pad must be connected to the plane of the most negative potential. 2 DIN+ Non-inverting input data. Internally terminated with 50Ω to a reference voltage. 3 DIN– Inverting input data. Internally terminated with 50Ω to a reference voltage. 5, 6 VCC Supply Voltage. Bypass with a 0.1µF//0.01µF low-ESR capacitor as close to VCC pin as possible. 9, 10 MOD– Inverted modulation current output. Outputs modulation current when input data is negative. 11, 12 MOD+ Non-inverted modulation current output. Outputs modulation current when input data is positive. 14 VREF Reference Voltage. Install a 0.1µF capacitor between VREF and VCC. 15 IM_SET 16 /EN Modulation current setting and control. The voltage applied to this pin will set the modulation current. To be connected to the MIC3003 pin 24 (VMOD+). Input impedance 25KΩ. A low-level signal on this pin will enable the output stage of the driver. Internally pulled down with 75KΩ. Truth Table MOD+ (1) MOD- (2) DIN+ DIN- /EN Laser Output L H L H L L H L L L H H X X H H L L Notes: 1. IMOD = 0 when MOD+ = H. 2. Assuming that the laser is tied to MOD+. January 2010 3 M9999-011310 [email protected] or (408) 955-1690 Micrel, Inc. SY88782L Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ........................... –0.5V to +4.0V CML Input Voltage (VIN) .......... VCC–1.2V to VCC+0.5V TTL Control Input Voltage (VIN) ...................0V to VCC Lead Temperature (soldering, 20sec.) ........... +260°C Storage Temperature (Ts) ............... –65°C to +150°C Supply Voltage (VCC)...........................+3.0V to +3.6V Ambient Temperature (TA) ................ –40°C to +85°C (3) Package Thermal Resistance QFN (θJA) Still-air ............................................. 60°C/W (ΨJB)......................................................... 33°C/W DC Electrical Characteristics TA = –40°C to +85°C and VCC = +3.0V to +3.6V, unless otherwise noted. Typical values are VCC = +3.3V, TA = 25°C, IMOD = 60mA. Symbol Parameter Condition Min ICC Power Supply Current Modulation currents excluded VMOD_MIN Minimum Voltage Required at the Driver Output (headroom) for Proper Operation RIN(DATA) Input Resistance (DIN+, DIN-) 45 VID Differential Input Voltage Swing 200 Typ 48 Max 65 (4) Units mA 0.6 V 50 /EN Low /EN High 55 Ω 2400 mVpp 0.8 V 2 RIN (IMOD_SET) IM_SET Input Resistance VIM_SET Voltage Range on IM_SET Pin V 25 IMOD range 10mA to 90mA kΩ 1.2 V AC Electrical Characteristics TA = –40°C to +85°C and VCC = +3.0V to +3.6V, unless otherwise noted. Typical values are VCC = +3.3V, TA = 25°C, IMOD = 60mA. Symbol Parameter Data Rate IMOD (5) Modulation Current Condition Min NRZ AC-coupled DC-coupled IMOD_OFF Modulation OFF Current Current at MOD+ when the device is disabled tr Output Current Rise Time 20% to 80%, IMOD = 60mA tf Output Current Fall Time 20% to 80%, IMOD = 60mA Total Jitter @1.25Gbps data rate Typ Max Units 0.05 1.25 Gbps 10 90 mA 10 Pulse-Width Distortion 70 (6) mA 750 A 55 80 ps 55 80 ps 20 psPP 20 ps 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 data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. Package Thermal Resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. ΨJB uses a 4-layer and θJA in still air unless otherwise stated. 4. ICC = 65mA for worst-case conditions with IMOD = 90mA, TA = +85°C, VCC = 3.6V. 5. Load = 15Ω. 6. Assuming VCC = 3.0V, Laser bandgap voltage = 1V, laser package inductance = 1nH, laser equivalent series resistor = 5Ω, and damping resistor = 10Ω. January 2010 4 M9999-011310 [email protected] or (408) 955-1690 Micrel, Inc. SY88782L Typical Operating Characteristics January 2010 5 M9999-011310 [email protected] or (408) 955-1690 Micrel, Inc. SY88782L Functional Characteristics January 2010 6 M9999-011310 [email protected] or (408) 955-1690 Micrel, Inc. SY88782L Input and Output Stages Figure 1b. Simplified Output Stage Figure 1a. Simplified Input Stage Interface the Input to Different Logic Drivers Figure 2a. DC-Coupling to LVPECL Driver Figure 2b. AC-Coupling to LVPECL Driver Figure 2c. AC-Coupling to CML Driver Figure 2d. AC-Coupling to LVDS Driver January 2010 7 M9999-011310 [email protected] or (408) 955-1690 Micrel, Inc. SY88782L 16 LEAD (3mmx3mm) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB 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 a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Incorporated. January 2010 8 M9999-011310 [email protected] or (408) 955-1690