SY88024L 11.3Gbps VCSEL DRIVER General Description The SY88024L is a single 3.3V supply, small form factor VCSEL driver for datacom applications at data rates up to 11.3Gbps. The driver can deliver modulation current up to 20mA and a bias current up to 20mA All support documentation can be found on Micrel’s web site at: www.micrel.com. . Features • • • • • Operates from a single 3.3V supply Operation up to 11.3Gbps Modulation current up to 20mA Bias current up to 20mA Small form factor 3mm x 3mm QFN package Applications • Multi-rate LAN up to 11.3Gbps: 8xFC, 10G GbE. • SFP+, XFP, XPAK, XENPAK, X2, MSA 300 optical modules __________________________________________________________________________________________ Typical Application Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com October 2009 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L Ordering Information(1) Part Number SY88024LMG (2) SY88024LMGTR Voltage Temperature Range Package Lead Finish 3.3V –40° to +85°C QFN-16 NiPdAu Pb-Free 3.3V –40° to +85°C QFN-16 NiPdAu Pb-Free 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 October 2009 2 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L Pin Description Pin Number Pin Name Pin Function 1, 4, 9, 12 VCC Supply Voltage. Bypass with a 0.1µF//0.01µF low ESR capacitor as close to the VCC pins as possible. 8, 14 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 50 Ω to VCC. 3 DIN– Inverting input data. Internally terminated with 50 Ω to VCC. 5 MODSET Modulation current setting and control. Apply a voltage within the range 0V to1.2V to this pin to set the modulation current. Input impedance 25k Ω. 6 /EN Active Low TTL. Internal 75kΩ pull down to GND. The driver is enabled when this pin is unconnected or /EN is asserted low and disabled when /EN asserted high. 7 EQSET Install a resistor from this pin to GND to set the desired equalization level. 0 Ω will provide maximum equalization and 2kΩ or higher will provide negligible equalization. Leave open if no equalization is needed. 10 MOD– Inverted modulation current output. Provides modulation current when input data is negative. 11 MOD+ Non-inverted modulation current output. Provides modulation current when input data is positive. 13 BIAS 15 BIASMON Bias Current Monitor. Install an external resistor from this pin to GND to convert the output current to a voltage proportional to the bias current 16 BIASSET Bias current setting and control. Apply a voltage within the range 0V to 1.2V to this pin to set the bias current. Input impedance 25kΩ. BIAS Current Output 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 H L Notes: 1. IMOD = 0 when MOD+ = H. 2. Assuming that the laser cathode is tied to MOD+. October 2009 3 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L 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 = 6mA, IBIAS = 6mA. Symbol Parameter Condition ICC Power Supply Current Modulation and bias currents excluded Min Typ VMOD_MIN Minimum Voltage Required at the Driver Output (headroom) for Proper Operation 1.2 V VBIAS_MIN Minimum Voltage Required at the BIAS Output (headroom) for Proper Operation 1.2 V RIN Input Resistance, Single Ended 45 VID Differential Input Voltage Swing 100 50 VIL /EN Input Low VIH /EN Input High 2 IBIAS Bias Current 1 IBias_OFF Bias OFF Current RMODSET Input Resistance at MODSET Pin VMODSET Voltage Range at MODSET Pin RBIASSET Input Resistance at BIASSET Pin VBIASSET Voltage Range at BIASSET Pin 50 Max 65 Units (4) mA 55 Ω 1000 mVPP 0.8 Current at BIAS when the device is disabled 20 mA 150 µA 25 IMOD range 2mA to 20mA kΩ 1.2 25 IBIAS range 1mA to 20mA V V V kΩ 1.2 V Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Package Thermal Resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. θJB uses a 4-layer and θJA in still air unless otherwise stated. 4. Maximum ICC measured with IMOD = 20mA and IBIAS = 20mA and MOD+/MOD- tied to VCC. October 2009 4 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L 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 = 6mA, IBIAS = 6mA. Symbol Parameter Condition Data Rate NRZ Min (5) IMOD Modulation Current AC-coupled IMOD_OFF Modulation OFF Current Current at MOD+ and MOD- when the device is disabled tr Output Current Rise Time 20% to 80%, 25Ω load tf Output Current Fall Time DJ RJ Typ Max Units 11.3 Gbps (6) mA 150 µA 25 35 ps 20% to 80%, 25Ω load 25 35 ps Deterministic Jitter K25.8 pattern at 11.3Gbps, VIN = 200mVPP 4 psPP Random Jitter K25.8 pattern at 11.3Gbps, VIN = 200mVPP 0.3 psPP 20 2 Notes: 5. IMOD is defined as the current going into the external load, which is equal to the total current of the output device subtracted by the current going into the internal 50Ω pull-up. 6. IMOD(MAX) is defined for a 50Ω external load. October 2009 5 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L Typical Characteristics Modulation Gain Bias Gain IBIAS / IBIASMON vs IBIAS 40 120 30 35 110 25 30 100 25 20 20 15 90 80 15 70 10 10 60 5 5 50 2 5 10 15 20 25 IBIAS (mA) 0 100 0 200 400 600 800 VBIASSET (mV) 1000 15 250 550 850 1150 VMODSET (mV) Note: IMOD is defined for a 50Ω external load. Functional Characteristics October 2009 6 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L Input and Output Stages Figure 1b. Simplified Output Stage Figure 1a. Simplified Input Stage Interfacing the Input to Differential Logic Drivers Figure 2b. AC-Coupling to CML Driver Figure 2a. AC-Coupling to LVPECL Driver October 2009 7 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L Functional Diagram composed from a differential pair which collectors are connected to MOD+/MOD- pins and have 50 Ω internal termination to VCC. The Modulation gain curve on page 6 shows modulation current variation versus the applied voltage at MODSET pin. Functional Description As shown on the block diagram above, the driver is composed from an input equalizer, and a modulation block consisting of a pre-driver, and a current source. Equalizer The input equalizer allows for compensation of up to 9” of FR4 microstrip trace or equivalent. The equalization restores the losses in high frequency components of the signal caused by its travel on the line card traces and through the connectors between the line card and the module before it reaches the input stage. The amount of equalization is programmable with a resistor from pin 7 to ground. Bias The bias is set by applying a voltage within the range 0V to 1.2V to pin 16 (BIASSET). The bias gain curve on page 6 shows bias current variation versus the applied voltage at pin 16. The SY88024L driver is designed to work with one of the Micrel’s MIC300X series of controllers which have built in APC (Automatic Power Control) circuit and a serial interface for programming modulation and bias, temperature compensation tables, setting registers, and monitoring registers read back. Refer to the MIC3001/MIC3002/MIC3003 datasheets for more details. The applications section below shows how to set up the driver to work correctly with the MIC300X controller. Modulator The modulator consists of a pre-driver and a current source. The modulation current is set in the pre-driver by applying a voltage within the range 0V to 1.2V to pin 5 (MODSET). The pre-driver provides the current to the output stage, which consists of a current source October 2009 8 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L management IC MIC300X. Application Information Figure 3, below, illustrates a typical optical transceiver using the SY88024L and one of the Micrel’s FOM Figure 3. Typical Optical Transceiver October 2009 9 M9999-102809-A [email protected] or (408) 955-1690 Micrel, Inc. SY88024L Package Information 16-Pin (3mm x 3mm) QFN 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. © 2009 Micrel, Incorporated. October 2009 10 M9999-102809-A [email protected] or (408) 955-1690