UX 2210 155Mbps to 2Gbps Laser Driver Features General Description The UX2210 is a complete CMOS laser driver for 155Mbps to 2Gbps.It consists of a bias current generator with automatic power control (APC), a modulation current driver and a reference voltage generator with temperature compensation. The UX2210 accepts differential PECL inputs and provides complementary output currents. The APC feature allows an optical transmitter to maintain constant average optical +3.0V to +5.5V Supply Voltage Automatic Power Control . Temperature-Compensated Modulation Current Programmable slow start Rise and Fall Times less than 250ps Apply to FP、DFB、VCSEL Laser Pin Configuration diodes caused by increased VCCB I NN I NP GN DB 19 18 FAILOUT VREF1 2 17 IPINSET OSADJ 3 IBIASFB 4 IBIASSET 5 IMODSET 6 temperature. 16 VREF2 UX2210 15 SLWSTRT 14 IPIN 13 VCCA 7 8 9 10 11 12 GNDA laser 20 OUTP typical 21 GNDA compensate the reduction in slope efficiency of 22 OUTN Utilizing a resistor at the IMODTC pin can 23 1 GNDA provided to simplify laser current programming. 24 ENBP I BI ASOUT A temperature stabilized reference voltage is I MODTC in laser efficiency with temperature and lifetime. ENBN power by a monitor photodiode, despite changes Figure 1. Pin Configuration QFN 24 Typical Application Circuit Figure 2. Typical Application Circuit 2006 Preliminary Datasheet www.uxfastic.com 1 UX 2210 155Mbps to 2Gbps Laser Driver Pin Description Pin No. Name 1 ENBP 2 VREF1 3 OSADJ 4 IBIASFB Bias-Feedback Current Output. 5 IBIASSET Laser Bias Current-Programming Input. 6 IMODSET Laser Modulation Current-Programming Input. 7 IBIASOUT Laser Bias Current Output. 8,10,12 Function Noninverting Enable Input. Temperature-Compensated Reference Output,connecting to VREF2 internally. Overshoot-Adjust Input. GNDA Ground 9 OUTN Inverting Modulation Output. 11 OUTP Noninverting Modulation Output. 13 VCCA +3.0V to +5.5V Supply Voltage 14 IPIN Monitor Photodiode Current Input. 15 SLWSTRT 16 VREF2 17 IPINSET Slow-Start Capacitor Input. Temperature-Compensated Reference Output. Monitor Photodiode Programming Input. Failout Output. Compatible TTL logic output. Connect FAILOUT 18 FAILOUT to VCC through a 4.7kΩ to 10KΩ pull-up resistor.In normally condition ,it is set low. 19 GNDB Ground 20 VINP Noninverting Data Input 21 VINN Inverting Data Input 22 VCCB +3.0V to +5.5V Supply Voltage 23 IMODTC 24 ENBN 2006 Preliminary Datasheet Connecting a resistor between this pin and ground to set the temperature independency of the modulation current Inverting Enable Input www.uxfastic.com 2 UX 2210 155Mbps to 2Gbps Laser Driver Absolute Maximum Ratings Symbol VCC TA TSTG Parameter Rating Units 6 V Operating ambient -40 to +85 °C Storage temperature -65 to +150 °C Power Supply (VCC-GND) DC Characteristics Symbol Parameter Min. IBIAS Range of Programmable Laser Bias Current VREF Reference Voltage IREF Available Reference Current Vin Total differential inplut signal VMD The dc voltage of input VOH FAILOUT Output High VOL FAILOUT Output Low 2.5 Typ. Max. Units 80 mA 2.8 V 2.65 8 mA 200 1600 0.6 VCC mV V VCC-0.4 V 0.3 V AC Characteristics (RLOAD (at OUTP and OUTN) = 25Ω connected to VCC, Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1) Symbol Parameter Range of IMOD Programmable Modulation Current TR, TF TPWD Modulation-Current Rise and Fall Time Conditions Min. Typ. Minimum differential input swing is 200mVp-p (Note 2) Max. Units 60 mA 250 ps IBIAS = 20mA, IMOD = 40mA, 4ns unit interval; measured 200 from 20% to 80% Modulation-Current IBIAS = 20mA, IMOD = 40mA, Pulse-Width Distortion 8ns period 25 ps Note 1: AC characteristics are guaranteed by design and characterization. Note 2: An 200mVp-p differential is equivalent to complementary 100mVp-p signals on VINP and VINN. 2006 Preliminary Datasheet www.uxfastic.com 3 UX 2210 155Mbps to 2Gbps Laser Driver Typical operating characteristcs (VCC=3.3V, TA=+25℃, unless otherwise noted) Rbiasset VS Ibias 100 Ibias(mA) 80 60 40 20 0 0 10 20 30 Rbiasset(kΩ) 40 50 40 50 Figure 3. Ibias Rmod vs Imod Imod(mA) 70 60 50 40 30 20 10 0 0 10 20 30 Rmod(kΩ) Figure 4. Imod Rpinset vs Ipin 2500 Ipin(uA) 2000 1500 1000 500 0 0 10 20 30 Rpinset(kΩ) 40 50 Figure 5. Ipin 2006 Preliminary Datasheet www.uxfastic.com 4 UX 2210 155Mbps to 2Gbps Laser Driver Package Information Figure 6. QFN24 Package 2006 Preliminary Datasheet www.uxfastic.com 5