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| NJW4702 3ch Laser Diode Driver sGENERAL DESCRIPTION NJW4702 is a laser diode driver for the operation of a grounded laser diode for CD-R and CD-RW drivers. It includes three channels current amplifiers for three different optical power levels. Reference inputs are voltage input, and voltage control is possible without external resistors. An on-chip RF oscillator is provided to reduce laser mode noise during read mode. Oscillation frequency and oscillation amplitude are defined by two external resistors. sFEATURES q Operating Voltage 4.5V to 5.5V q On-chip RF Oscillator 200MHz to 500MHz q Rise-time/Fall-time 1.0ns typ. q Maximum Output Current 250mA typ. q Bi-CMOS Technology q Package Outline PCSP16(3.5mm 0.65mm pitch) sBLOCK DIAGRAM sPACKAGE OUTLINE NJW4702SE8 IOUT 12 GND 11 RAMP 10 ENABLE 9 H:ON VCC2 13 H:ON L:ON L:ON 8 OSCEN GND 14 OSC BIAS 7 VCC1 GND 15 6 GND VINR 16 5 OUTEN3 1 RFREQ 2 VIN2 3 VIN3 4 OUTEN2 Ver.1 -1- NJW4702 sABSOLUTE MAXUIMUM RATING (Ta=25C) PARAMETERS SYMBOL RATINGS + Supply Voltage V 6.0 Power Dissipation PD 860 * Operating Temperature Range Topr -40 to +85 Storage Temperature Range Tstg -40 to +125 *EIA/JEDEC STANDARD Test Board(76.2x114.3x1.6mm,4layers,FR-4)mounting sRECOMMENDED OPERATING CONDITION (Ta=25C) PARAMETERS Operating Voltage SYMBOL Vopr TEST CONDITION MIN. 4.5 TYP. 5.0 MAX. 5.5 UNIT V UNIT V mW C C sELECTRICAL CHARACTERISTICS qDC CHARACTERISTICS(Vcc=5.0V,ENABLE=H,OUTEN=H,OSCEN=L, H:5V,L:GND,2V to Iout, Ta=25C unless otherwise specified) PARAMETERS Supply Current 1 Supply Current 2 Supply Current 3 Supply Current 4 Supply Current 5 High Level Input Voltage Low level Input Voltage High Level Input Current Low Level Input Current Shutdown Voltage SYMBOL ICC1 ICC2 ICC3 ICC4 ICC5 VIH VIL IIH IIL Vshut TEST CONDITION ENABLE0.5V VINR/2/3=0V OSCEN=H,RAMP=1k,RFREQ=3.6k VINR=0V,VIN2=0.3V,VIN3=0.3V VINR=0.8V,VIN2/3=0.3V MIN. 3.5 -100 3.4 TYP. 0 5 55 20 80 MAX. 10 7 75 30 110 1.5 100 3.7 UNIT A mA mA mA mA V V A A V VINR=0.8V,VIN2/3=0.3V, OUTEN=L,OSCEN=H,Vcc at Icc1mA qLaser Amp DC CHARACTERISTICS (Vcc=5.0V,ENABLE=H,OUTEN=H,OSCEN=L, H:5V,L:GND,2V to Iout, Ta=25C unless otherwise specified) PARAMETERS Current Convert Gain 1 Current Convert Gain 2 Output Offset Current Output Current Linearity Input Voltage Range Maximum Output Current 1 Maximum Output Current 2 SYMBOL Gi1 Gi2 Ios IIin VrefR CHR *1 CH2/3 *1 CHR/2/3 *1 CHR/2/3 *1 CHR/2/3 TEST CONDITION MIN. 35 80 -2 -3 0 100 200 6 - TYP. 50 120 150 250 6 9 10 10 -800 -800 MAX. 65 160 +8 +3 5 12 1.0 3.0 15 15 - UNIT mA/V mA/V mA % V mA mA k mA mA %/V %/V ppm/C ppm/C Iomax1 CHR Iomax2 CH2/3 Ro Rin Ioff1 Ioff2 Vc1 Vc2 TC1 TC2 Iout Series Resistance Input Resistance Output OFF Current 1 Output OFF Current 2 Supply Voltage Alternation of Output Current 1 Supply Voltage Alternation of Output Current 2 OUTEN=H,VINR/2/3=0V,Total for All Channels OUTEN=L,VINR/2/3=0V,Total for All Channels Vcc=4.5 to 5.5V,VINR=0.8V,CHR only Vcc=4.5 to 5.5V,OUTEN2or3=L,VINR=0.8V, VIN2/3=0.3V,CHR+CH2or3 VINR=0.8V,CHR only OUTEN2or3=L,VINR=0.8V,VIN2/3=0.3V, CHR+CH2or3 Temperature coefficient of Output Current 1 Temperature coefficient of Output Current 2 *1 The amplifier linearity is calculated using best fit method at three points. The output currents chosen 20mA, 40mA,and, 60mA.The transfer function for Iout is defined as follows: Iout =Gi*VIN+Ios Ver.1 -2- NJW4702 qLaser Amp AC CHARACTERISTICS(Vcc=5.0,Ta=25C unless otherwise specified) PARAMETERS Enable Time Disable Time ON Time OFF Time Rise Time Fall Time Over Shoot Oscillator Frequency Oscillator Temperature Coefficient Output Current Noise sIout Control ENABLE L/OPEN H H H H sOscillator Control ENABLE L/OPEN H H sTiming Diaglam OSCEN X L/OPEN H OUTEN2 X X X OUTEN3 X X X OSCILLATOR OFF OFF ON OUTEN2 X H/OPEN L H/OPEN L OUTEN3 X H/OPEN H/OPEN L L OFF Iout=VINR*Gi1 Iout=VINR*Gi1+VIN2*Gi2 Iout=(VINR+VIN3)*Gi1 Iout=(VIN2+VIN3)*Gi1+VIN2*Gi2 Iout SYMBOL Ten Tdis Ton Toff Tr Toff OS fOSC TEST CONDITION ENABLE LH 50% to Iout 50%, Iout=40mA ENABLE HL 50% to Iout 50%, Iout=40mA OUTEN HL 50% to Iout 50%, Iout=40mA+40mA OUTEN LH 50% to Iout 50%, Iout=40mA+40mA CHR+CH2/3,Iout 10-90%,Iout=40mA+40mA CHR+CH2/3,Iout 10-90%,Iout=40mA+40mA Rfreq=3.6k MIN. 380 TYP. MAX. 150 20 1 1 1 1 5 470 -300 3.5 560 UNIT ns ns ns ns ns ns % MHz ppm/C nA/Hz TcOSC Rfreq=3.6k Ino Iout=40mA,CHR only ENABLE OUTEN2 OUTEN3 Ten Ton Toff Ton Toff Tdis Iout Tr Tf Tr Tf Ver.1 -3- NJW4702 sTEST CIRCUIT GND 3.6kohm VINR RFREQ VIN2 VIN3 OUTEN2 OUTEN3 GND GND VCC2 IOUT GND 1kohm RAMP ENABLE OSCEN VCC1 5V oscilloscope Current Probe sAPPLICATION CIRCUIT Vcc GND VINR DAC RFREQ VIN2 VIN3 OUTEN2 OUTEN3 CMOS GND GND VCC 2 IOUT GND RAMP ENABLE OSCEN VCC1 Vcc LaserDiode PhotoDiode [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Ver.1 -4- |
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