T0820_05

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 I2 NE2 IR ENABLE Channel 3 Channel 2 IOUT Read channel ENOSC RF oscillator RF RS 2 T0820 4506G–DVD–11/05 T0820 2. Pin Configuration Figure 2-1. Pinning SSO16 IR I2 RF I3 I4 NE2 NE3 NE4 1 2 3 4 16 15 14 13 VCC1 VCC2 IOUT GND RS ENABLE ENOSC VCC2 T0820 5 6 7 8 12 11 10 9 Table 2-1. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Description Symbol IR I2 RF I3 I4 NE2 NE3 NE4 VCC2 ENOSC ENABLE RS GND IOUT VCC2 VCC1 Type Analog Analog Analog Analog Analog Digital Digital Digital Supply Digital Digital Analog Supply Analog Supply Supply Function Input current, bias voltage approximately GND Input current, bias voltage approximately GND External resistor to GND sets oscillator frequency Input current, bias voltage approximately GND Input current, bias voltage approximately GND Digital control of channel 2 (low active) Digital control of channel 3 (low active) Digital control of channel 4 (low active) +5V power supply for IOUT Enables RF oscillator (high active) Enables output current (high active) External resistor to GND sets oscillator swing Ground Output current source for laser diode +5V power supply for IOUT +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 Supply voltage Input voltage at IR, I2, I3, I4 Input voltage at NE2, NE3, NE4, ENOSC Output voltage Power dissipation Junction temperature Storage temperature range Notes: 1. RthJA ≤ 115 k/W, Tamb = 70°C 2. RthJA ≤ 115 k/W, Tamb = 25°C Symbol VCC VIN1 VIN2 VOUT PMAX Tj Tstg Value –0.5 to +6.0 –0.5 to +0.8 –0.5 to VCC +0.5 –0.5 to VCC –1 0.7(1) to 1(2) 150 –65 to +125 Unit V V V V W °C °C 4. Thermal Resistance Parameters Junction ambient Note: Symbol RthJA Value 115 (1) Unit K/W 1. Measured with multi-layer test board (JEDEC standard) 5. Operating Range Parameters Supply voltage range Input current External resistor to GND to set oscillator frequency External resistor to GND to set oscillator swing Operating temperature range Symbol VCC IIR, II2, II3, II4 RF RS Tamb Value 4.5 to 5.5 3 > 100 0 to +70 Unit V mA kΩ Ω °C 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 1.1 Parameters Power supply Supply current, power down Supply current, read mode, oscillator disabled Supply current, read mode, oscillator enabled ENABLE = Low, NE2 = NE3 = NE4 = Low IIR = II2 = II3 = II4 = 500 µA IIR = II2 = II3 = II4 = 500 µA, ENOSC = High, RS = 560Ω , RF = 7.5 kΩ IIR = II2 = II3 = II4= 500 µA, NE2 = NE3 = NE4 = Low IIR = II2 = II3 = II4 = 0 µA 9, 15, 16 9, 15, 16 ICCPD2 ICCR1 0.3 mA A Test Condition Pin Symbol Min. Typ. Max. Unit Type* 1.2 95 mA A 1.3 9, 15, 16 ICCR2 100 mA A 1.4 Supply current, write mode Supply current, input off Digital inputs NE2/NE3/NE4 low voltage NE2/NE3/NE4 high voltage ENABLE low voltage ENABLE high voltage ENOSC low voltage ENOSC high voltage 9, 15, 16 9, 15, 16 ICCW ICCoff 230 mA A 1.5 2 2.1 2.2 2.3 2.4 2.5 2.6 3 3.1 3.2 3.3 3.4 3.5 3.6 16 mA A 6, 7, 8 6, 7, 8 11 11 10 10 VNELO VNEHI VENLO VENHI VEOLO VEOHI 3.0 3.0 2.0 1.3 V V A A A A A A 0.5 0.5 V V V V Current at digital inputs NE2/NE3/NE4 low current NE2/NE3/NE4 high current ENABLE low current ENABLE high current ENOSC low current ENOSC high current NE = 0V NE = 5V ENABLE = 0V ENABLE = 5V ENOSC = 0V ENOSC = 5V 6, 7, 8 6, 7, 8 11 11 10 10 INELO INEHI IENLO IENHI IEOLO IEOHI –100 800 –150 100 –300 800 µA µA µA µA µA µA A A A A A A * 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 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 Parameters Laser Amplifier Best fit current gain Best fit current offset Output current linearity Input current range Output current read channel Output current channel 2 Output current channel 3 Output current channel 4 Output current read channel + channel 2 Any channel(1) Any channel(1) Any channel(1) Input is sinking Output is sourcing Output is sourcing Output is sourcing Output is sourcing Output is sourcing 14 14 14 1, 2, 4, 5 14 14 14 14 14 14 14 14 1, 2, 4, 5 6, 7, 8 GAIN IOS ILIN IDAC IOUTR IOUT2 IOUT3 IOUT4 IOUTR,2 IOUT3,4 IOUT ROUT RIN VTH IOFF1 14 IOFF2 150 90 –8 –3 0 150 150 200 200 150 200 300 8 200 1.68 1 1 250 105 130 +4 +3 3 mA/mA mA % mA mA mA mA mA mA mA mA Ω Ω V mA mA A A A C A A A A A A A C A B A A Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Output current channel 3 + Output is sourcing channel 4 Total output current IOUT series resistor IIN input impedance NE threshold Output off current 1 Output off current 2 Output is sourcing IOUT = 250 mA total ROUT to VCC-Rail RIN is to GND Temperature stabilized ENABLE = Low NE2 = NE3 = NE4 = High, IIR = 0 µA, II2 = II3 = II4 = 500 µA NE2 = NE3 = NE4 = Low, IIR = II2 = II3 = II4= 0 µA IOUT = 40 mA, VCC = 5V ±10%, read only IOUT = 80 mA, 40 mA read + 40 mA write, VCC = 5V ±10% IOUT = 40 mA, ENOSC = Low IOUT = 40 mA, read only IOUT = 80 mA, 40 mA read + 40 mA Write 4.17 Output off current 3 14 IOFF3 5 mA A 4.18 IOUT supply sensitivity, read mode IOUT supply sensitivity, write mode IOUT current output noise IOUT temperature sensitivity, read mode IOUT temperature sensitivity, write mode 14 VSER –4 –1 %/V A 4.19 14 VSEW INOO TSER TSEW –4 0.2 %/V nA/ rt-Hz ppm/°C ppm/°C A 4.20 4.21 4.22 14 14 14 3 –500 –600 C C C *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Note: 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 6 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 5.1 5.2 5.3 Parameters Test Conditions IOUT = 40 mA (read) + 40 mA (10% – 90%)(1) IOUT = 40 mA (read) + 40 mA (10% – 90%)(1) IOUT = 40 mA (read) + 40 mA (1) NE 50% High-Low to IOUT at 50% of final value NE 50% Low-High to IOUT at 50% of final value ENABLE 50% High-Low to IOUT at 50% of final value ENABLE 50% Low-High to IOUT at 50% of final value IOUT = 50 mA, all channels, –3 dB value RF = 7.5 kΩ RS = 560Ω RF = 7.5 kΩ RS = 560Ω ENOSC 50% Low-High to IOUT at 50% of final value ENOSC 50% High-Low to IOUT at 50% of final value RF = 7.5 kΩ RS = 560Ω Pin Symbol Min. Typ. Max. Unit Type* Laser Current Amplifier Output AC Performance Write rise time Write fall time Output current overshoot IOUT ON prop delay 14 14 14 tRISE tFALL OS 1.0 1.1 5 3.0 3.0 ns ns % C C C 5.4 14 tON 2.0 ns C 5.5 IOUT OFF prop delay 14 tOFF 2.0 ns C 5.6 Disable time 14 tDIS 10 ns C 5.7 Enable time 14 tEN BWLCA 50 ns C 5.10 6 6.1 Amplifier bandwidth Oscillator Oscillator frequency Oscillator temperature coefficient Disable time oscillator 14 20 MHz C 14 FOSC TCOSC 255 300 350 MHz ppm/ °C ns A 6.2 14 -150 C 6.3 14 TDISO 4 C 6.4 Enable time oscillator 14 TENO SOSC 35 2 ns C 6.5 Oscillator swing 14 55 mApp A *) 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) 550 500 450 400 350 300 250 200 4 5 6 7 8 9 10 Frequency (MHz) RF ( kOhm ) Figure 9-2. Oscillator Swing vs. Resistor RS (RF = 7.5 kΩ) 120 100 Swing (mA pk-pk) 80 60 40 20 0 0 300 600 900 1200 1500 RS ( Ohm ) Figure 9-3. Oscillator Frequency Depending of Swing (RS = 560Ω) 60 50 Swing (mA pk-pk) 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) 300 250 200 IOUT (mA) 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) 300 250 200 IOUT (mA) 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 tON tON tEN tr tr Figure 9-8. Typical Application Circuit tOFF tOFF tOFF tr tf tf tf tDIS VCC A n a l o g IR 1 I2 2 RF 3 I3 4 I4 5 NE2 D i g i t a l 6 NE3 7 NE4 8 9 10 VCC2 VCC 11 ENOSC 12 ENABLE 13 RS 14 GND 15 IOUT LD 16 VCC2 VCC1 10 T0820 4506G–DVD–11/05 T0820 10. Ordering Information Extended Type Number T0820-TCQG Package SSO16 Remarks Taped and reeled, Pb-free 11. Package Information 11 4506G–DVD–11/05 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 1150 East Cheyenne Mtn. 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