Features • • • • • • • • • • • • • • Current-controlled Output Current Source with 4 Input Channels Low-power Consumption Output Current up to 150 mA, Read Channel and Channel 2 Output Current up to 200 mA, Channel 3 and Channel 4 Total Output Current to 300 mA Rise Time 1.0 ns, Fall Time 1.1 ns On-chip RF Oscillator Control Frequency and Swings by Use of 2 External Resistors Oscillator Frequency Range from 200 MHz to 600 MHz Oscillator Swing to 100 mA Single 5V Power Supply Common Enable/Disable Input TTL/CMOS Control Signals Small SSO16 Package 4-channel Laser Driver with RF Oscillator T0820 Application • • • • • DVD-RAM DVD-RW DVD+RW CD-RW Writable Optical Drives 1. Description The T0820 is a laser diode driver for the operation of a grounded laser diode for writable optical drives. It includes four channels for four different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level whereas channels 2 to 4 are provided as write channels with very fast switching speeds. Write current pulses are enabled when a "low" signal is applied to the NE pins. All channels are summed together at the IOUT pin. Read channel and channel 2 can contribute up to 150 mA and channels 3 and 4 up to 200 mA to the total output current of up to 300 mA. A total gain of 100 is provided between each reference current input and the selected output. Although the reference inputs are current inputs voltage control is possible by using external resistors. Frequency and swing can be set by two external resistors. Oscillation is enabled by a "high" at the ENOSC pin. Complete output current and oscillator switch-off is achieved by a `low' at the ENABLE input. Rev. 4506G–DVD–11/05 Figure 1-1. Block Diagram I4 NE4 Channel 4 I3 NE3 Channel 3 I2 NE2 Channel 2 IR ENABLE ENOSC Read channel RF oscillator RF 2 IOUT RS T0820 4506G–DVD–11/05 T0820 2. Pin Configuration Figure 2-1. Pinning SSO16 IR 1 16 VCC1 I2 2 15 VCC2 RF 3 14 IOUT I3 4 13 GND I4 5 12 RS NE2 6 11 ENABLE NE3 7 10 ENOSC NE4 8 9 VCC2 T0820 Table 2-1. Pin Description Pin Symbol Type 1 IR Analog Function Input current, bias voltage approximately GND 2 I2 Analog Input current, bias voltage approximately GND 3 RF Analog External resistor to GND sets oscillator frequency 4 I3 Analog Input current, bias voltage approximately GND 5 I4 Analog Input current, bias voltage approximately GND 6 NE2 Digital Digital control of channel 2 (low active) 7 NE3 Digital Digital control of channel 3 (low active) 8 NE4 Digital Digital control of channel 4 (low active) 9 VCC2 Supply +5V power supply for IOUT 10 ENOSC Digital Enables RF oscillator (high active) 11 ENABLE Digital Enables output current (high active) 12 RS Analog External resistor to GND sets oscillator swing 13 GND Supply Ground 14 IOUT Analog Output current source for laser diode 15 VCC2 Supply +5V power supply for IOUT 16 VCC1 Supply +5V power supply for circuit 3 4506G–DVD–11/05 3. Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Symbol Value Unit Supply voltage VCC –0.5 to +6.0 V Input voltage at IR, I2, I3, I4 VIN1 –0.5 to +0.8 V Input voltage at NE2, NE3, NE4, ENOSC VIN2 –0.5 to VCC +0.5 V Output voltage VOUT –0.5 to VCC –1 V Power dissipation PMAX 0.7(1) to 1(2) W Tj 150 °C Tstg –65 to +125 °C Symbol Value Unit (1) K/W Symbol Value Unit VCC 4.5 to 5.5 V Junction temperature Storage temperature range Notes: 1. RthJA ≤ 115 k/W, Tamb = 70°C 2. RthJA ≤ 115 k/W, Tamb = 25°C 4. Thermal Resistance Parameters Junction ambient Note: RthJA 115 1. Measured with multi-layer test board (JEDEC standard) 5. Operating Range Parameters Supply voltage range IIR, II2, II3, II4 <2 mA External resistor to GND to set oscillator frequency RF >3 kΩ External resistor to GND to set oscillator swing RS > 100 Ω Operating temperature range Tamb 0 to +70 °C Input current 4 T0820 4506G–DVD–11/05 T0820 6. Electrical Characteristics: General VCC = 5V, Tamb = 25°C, ENABLE = High, NE2 = NE3 = NE4 = High, ENOSC = Low, unless otherwise specified No. 1 Parameters Test Condition Pin Symbol Min. Typ. Max. Unit Type* Power supply 1.1 Supply current, power down ENABLE = Low, NE2 = NE3 = NE4 = Low 9, 15, 16 ICCPD2 0.3 mA A 1.2 Supply current, read mode, oscillator disabled IIR = II2 = II3 = II4 = 500 µA 9, 15, 16 ICCR1 95 mA A 1.3 Supply current, read mode, oscillator enabled IIR = II2 = II3 = II4 = 500 µA, ENOSC = High, RS = 560Ω, RF = 7.5 kΩ 9, 15, 16 ICCR2 100 mA A 1.4 Supply current, write mode IIR = II2 = II3 = II4= 500 µA, NE2 = NE3 = NE4 = Low 9, 15, 16 ICCW 230 mA A 1.5 Supply current, input off IIR = II2 = II3 = II4 = 0 µA 9, 15, 16 ICCoff 16 mA A 2 Digital inputs V A V A 0.5 V A V A 0.5 V A 2.1 NE2/NE3/NE4 low voltage 6, 7, 8 VNELO 2.2 NE2/NE3/NE4 high voltage 6, 7, 8 VNEHI 2.3 ENABLE low voltage 11 VENLO 1.3 2.0 2.4 ENABLE high voltage 11 VENHI 2.5 ENOSC low voltage 10 VEOLO 2.6 ENOSC high voltage 10 VEOHI 3.0 V A –300 µA A µA A µA A µA A µA A µA A 3 3.0 Current at digital inputs 3.1 NE2/NE3/NE4 low current NE = 0V 6, 7, 8 INELO 3.2 NE2/NE3/NE4 high current NE = 5V 6, 7, 8 INEHI 3.3 ENABLE low current ENABLE = 0V 11 IENLO 3.4 ENABLE high current ENABLE = 5V 11 IENHI 3.5 ENOSC low current ENOSC = 0V 10 IEOLO 3.6 ENOSC high current ENOSC = 5V 10 IEOHI 800 –150 100 –100 800 * Type means: A: 100% tested B: 100% correlation tested C: Characterized on samples D: Design parameter 5 4506G–DVD–11/05 7. Electrical Characteristics: Laser Amplifier VCC = 5V, Tamb = 25°C, ENABLE = High, unless otherwise specified No. 4 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit 105 Type* Laser Amplifier 4.1 Best fit current gain Any channel(1) 14 GAIN 90 130 mA/mA A 4.2 Best fit current offset Any channel(1) 14 IOS –8 +4 mA A 4.3 Output current linearity Any channel(1) 14 ILIN –3 +3 % A 4.4 Input current range Input is sinking 1, 2, 4, 5 IDAC 0 3 mA C 4.5 Output current read channel Output is sourcing 14 IOUTR 150 mA A 4.6 Output current channel 2 Output is sourcing 14 IOUT2 150 mA A 4.7 Output current channel 3 Output is sourcing 14 IOUT3 200 mA A 4.8 Output current channel 4 Output is sourcing 14 IOUT4 200 mA A 4.9 Output current read channel + channel 2 Output is sourcing 14 IOUTR,2 150 mA A 4.10 Output current channel 3 + Output is sourcing channel 4 14 IOUT3,4 200 mA A 4.11 Total output current Output is sourcing 14 IOUT 300 mA A 4.12 IOUT series resistor IOUT = 250 mA total ROUT to VCC-Rail 14 ROUT Ω C 4.13 IIN input impedance RIN is to GND 1, 2, 4, 5 RIN Ω A 4.14 NE threshold Temperature stabilized 6, 7, 8 VTH V B 4.15 Output off current 1 ENABLE = Low 4.16 Output off current 2 NE2 = NE3 = NE4 = High, IIR = 0 µA, II2 = II3 = II4 = 500 µA 4.17 Output off current 3 4.18 8 150 200 250 1.68 IOFF1 1 mA A 14 IOFF2 1 mA A NE2 = NE3 = NE4 = Low, IIR = II2 = II3 = II4= 0 µA 14 IOFF3 5 mA A IOUT supply sensitivity, read mode IOUT = 40 mA, VCC = 5V ±10%, read only 14 VSER –4 –1 %/V A 4.19 IOUT supply sensitivity, write mode IOUT = 80 mA, 40 mA read + 40 mA write, VCC = 5V ±10% 14 VSEW –4 0.2 %/V A 4.20 IOUT current output noise IOUT = 40 mA, ENOSC = Low 14 INOO 3 nA/ rt-Hz C 4.21 IOUT temperature sensitivity, read mode IOUT = 40 mA, read only 14 TSER –500 ppm/°C C 4.22 IOUT temperature sensitivity, write mode IOUT = 80 mA, 40 mA read + 40 mA Write 14 TSEW –600 ppm/°C C *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Note: 6 1. Linearity of the amplifier is calculated using a best fit method at three operating points of IOUT at 20 mA, 40 mA, and 60 mA. IOUT = (IIN × GAIN) + IOS T0820 4506G–DVD–11/05 T0820 8. Electrical Characteristics: Laser Current Amplifier Output AC Performance VCC = +5V, IOUT = 40 mA DC with 40 mA pulse, Tamb = 25°C, unless otherwise specified No. 5 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Laser Current Amplifier Output AC Performance 5.1 Write rise time IOUT = 40 mA (read) + 40 mA (10% – 90%)(1) 14 tRISE 1.0 3.0 ns C 5.2 Write fall time IOUT = 40 mA (read) + 40 mA (10% – 90%)(1) 14 tFALL 1.1 3.0 ns C 5.3 Output current overshoot IOUT = 40 mA (read) + 40 mA (1) 14 OS 5 % C 5.4 IOUT ON prop delay NE 50% High-Low to IOUT at 50% of final value 14 tON 2.0 ns C 5.5 IOUT OFF prop delay NE 50% Low-High to IOUT at 50% of final value 14 tOFF 2.0 ns C 5.6 Disable time ENABLE 50% High-Low to IOUT at 50% of final value 14 tDIS 10 ns C 5.7 Enable time ENABLE 50% Low-High to IOUT at 50% of final value 14 tEN 50 ns C 5.10 Amplifier bandwidth IOUT = 50 mA, all channels, –3 dB value 14 BWLCA 20 MHz C MHz A 6 Oscillator 6.1 Oscillator frequency RF = 7.5 kΩ RS = 560Ω 14 FOSC 6.2 Oscillator temperature coefficient RF = 7.5 kΩ RS = 560Ω 14 TCOSC -150 ppm/ °C C 6.3 Disable time oscillator ENOSC 50% Low-High to IOUT at 50% of final value 14 TDISO 4 ns C 6.4 Enable time oscillator ENOSC 50% High-Low to IOUT at 50% of final value 14 TENO 2 ns C 6.5 Oscillator swing RF = 7.5 kΩ RS = 560Ω 14 SOSC mApp A 255 300 35 350 55 *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Note: 1. Load resistor at IOUT 10Ω, measurement with a 50-Ω oscilloscope and a 39-Ω series resistor 7 4506G–DVD–11/05 9. Application Information Figure 9-1. Oscillator Frequency vs. Resistor RF (RS = 560Ω) 550 Frequency (MHz) 500 450 400 350 300 250 200 4 5 6 7 8 9 10 RF ( kOhm ) Figure 9-2. Oscillator Swing vs. Resistor RS (RF = 7.5 kΩ) 120 Swing (mA pk-pk) 100 80 60 40 20 0 0 300 600 900 1200 1500 RS ( Ohm ) Figure 9-3. Oscillator Frequency Depending of Swing (RS = 560Ω) 60 Swing (mA pk-pk) 50 40 30 20 10 0 200 250 300 350 400 450 500 550 600 Frequency ( MHz ) 8 T0820 4506G–DVD–11/05 T0820 Figure 9-4. Transfer Characteristic of Channel 2 (gain = 112) 300 250 IOUT (mA) 200 150 100 50 0 0 500 1000 1500 2000 2500 3000 I2 ( µA ) Figure 9-5. Transfer Characteristic of Channel 3 and 4 (gain = 112) 300 250 IOUT (mA) 200 150 100 50 0 0 500 1000 1500 2000 2500 3000 I3 ( µA ) Figure 9-6. Step Response, Read Channel: 50 mA, Channel 3 = 200 mApp 9 4506G–DVD–11/05 Figure 9-7. Timing Diagram ENABLE NE2 NE3 NE4 tON tOFF tON tOFF tON tOFF tEN tr tr tf tr Figure 9-8. tDIS tf tf Typical Application Circuit VCC A n a l o g IR VCC1 1 16 2 15 3 14 4 13 5 12 6 11 7 10 I2 VCC2 RF I3 GND I4 RS NE2 D i LD IOUT ENABLE NE3 ENOSC VCC2 NE4 8 9 VCC g i t a l 10 T0820 4506G–DVD–11/05 T0820 10. Ordering Information Extended Type Number Package Remarks T0820-TCQG SSO16 Taped and reeled, Pb-free 11. 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