01.08.28 F0510203B ♦ Features • Up to 1.5 Gbps high speed operation • -5 V single power supply • Up to 40 mA p-p modulation current • Up to 50 mA bias current • Maximum bias current preset control 1.5Gbps Laser Diode Driver With Input Bias Circuit ♦ Applications • Laser diode driver of an optical transmitter circuit for SDH (STM4) ♦ Functional Description The F0510203B is a high performance GaAs integrated laser diode driver for use in an optical transmitter circuit up to 1.5 Gbps NRZ data rate. The F0510203B typically specifies rise time and fall time of 100 psec (20% - 80%). It features single -5 V supply operation, 1 to 50 mA presettable bias current and up to 40 mA modulation current. F0510203B 1.5Gbps Laser Diode Driver ♦ Absolute Maximum Ratings Ta = 25 °C, unless specified Parameter Symbol Value Units VSS VDD- 7 to VDD+0.5 V VIN1, VIN2 VSS to VDD+0.5 V VOUT1, VOUT2 VSS to VDD+0.5 V Modulation Current Control Voltage VM VSS to VSS+1.3 V Maximum Bias Current Setting Voltage VB VSS to VSS+1.7 V Tstg -55 to +125 ° C Ta -40 to +85 ° C Supply Voltage Input Voltage Output Voltage Storage Temparature Ambient Operating Temparature ♦ Recommended Operating Conditions VDD= GND Parameter Value Symbol Units Min. Typ. Max. Supply Voltage VSS VDD-5.25 VDD-5 VDD-4.75 V Ambient Operating Temparature Ta 0 25 85 °C F0510203B 1.5Gbps Laser Diode Driver ♦ Electrical Characteristics Ta =0 ~ 85 °C, VSS = - 5.25 ~ -4.75 V, VDD =GND unless specified Value Parameter Circuit Current (1) Input Voltage Symbol ISS VIH TestConditions Typ. Max. - 28 40 mA -1.0 - -0.8 V -1.8 - -1.6 V VIN1 , VIN2 =-1.8V -80 - 80 µA VM =VB=VSS , without IM,IB Differential Mode VIL Input Current IIN1,IIN2 Units Min. Modulation Current IMMAX VM =VSS+1.3V, Ta =25° C 40 - - mA Bias Current IBMAX VB =VSS+1.7V, Ta =25° C 50 - - mA Bias Current Setting Voltage(IM=20mA) VM20 IM=20mA, VSS=-5V Ta=25° C VSS+0.73 - VSS+0.92 V LEAK Current ILEAK VM=VSS +0.01V VB=VSS +0.1V - - 0. 9 mA Rise Time tr RL = 25Ω 20% - 80% - 100 150 ps Fall Time tf RL = 25Ω 20% - 80% - 100 150 ps F0510203B 1.5Gbps Laser Diode Driver ♦ Block Diagram OUT OUTB GND OUTBIAS VINR VIN + VINB - VINBR VSS VM VSSM ♦ Die Pad Description VIN Input VINR Bias Voltage for Input VINB Input VINBR Bias Voltage for Input VSS Supply Voltage VSSM Supply Voltage VSSB Supply Voltage VM Modulation Current control VB Bias Current Control OUT Output OUTB Output OUTBIAS Bias Current for Laser GND GND VSSB VB F0510203B 1.5Gbps Laser Diode Driver ♦ Die Pad Assignments (11) Symbol (9) (8) (12) (7) (13) (6) (1) No. (10) (2) (3) (5) (4) Center Coordinates(µm) No. Symbol Center Coordinates(µm) (1) VIN (184,80) (10) VINBR (470,810) (2) VINR (470,80) (11) VINB (184,810) (3) OUT (680,80) (12) VDD (80,585) (4) OUTBIAS (880,80) (13) VSS (80,305) (5) VB (1180,80) O (0,0) (6) VSSB (1310,305) A (1390,890) (7) VSSM (1310,585) (8) VM (1180,810) (9) OUTB (680,810) F0510203B 1.5Gbps Laser Diode Driver ♦ Test Circuits DC Source/ Monitor Unit OUT OUTB OUTBIAS VIN1 VM VIN2 DUT VB VSSB VM VSS VSSM Probing System with Temp. chuck DC Source/ Monitor Unit F0510203B 1.5Gbps Laser Diode Driver ♦ Typical DC Characteristics (1)Switching Characteristics Modulation Current IM(mA) IO (mA) 80.00 8.000 /div .0000 -1.800 .1000/div (v) -8.000 Input Voltage VIN1(V) (VSS=-5.0V, VM =-3.7V) (2)Modulation Current Control Modulation Current IM(mA) IO (mA) 80.00 8.000 /div .0000 -5.000 .1500/div (v) Control Voltage VM(V) (VSS=-5.0V, VIN1 =-1.7V, VIN2 =-0.9V) -3.500 F0510203B 1.5Gbps Laser Diode Driver (3)Bias Current Control Modulation Current IM(mA) IO (mA) 80.00 8.000 /div .0000 -5.000 .2000/div (v) -3.000 Control Voltage VB(V) (VSS=-5.0V, VIN1 , VIN2 , VM : no connect) Electron Device Department