T0816_05

Features • • • • • • • • • • • • • Current-controlled Output Current Source, 3 Input Channels Low-power Consumption Output Current per Channel to 250 mA Total Output Current to 300 mA Rise Time 1.0 ns, Fall Time 1.1 ns On-chip RF Oscillator Control of Frequency and Swing by Use of 2 External Resistors Oscillator Frequency Range from 200 MHz to 500 MHz Oscillator Swing to 100 mA Single 5V Power Supply Common Enable, Disable Input TTL/CMOS Control Signals Small SSO16 Package and QFN16 Package 3-channel Laser Driver with RF Oscillator T0816 Applications • CD-RW Drives • Writable Optical Drives 1. Description The T0816 is a laser diode driver for the operation of a grounded laser diode for CD-RW drives. It includes three channels for three different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level whereas channels 2 and 3 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. Each channel can contribute up to 250 mA to the total output current of up to 300 mA. A total gain of 100 (read channel), 250 (channel 2) and 150 (channel 3) are provided between each reference current input and the output. Although the reference inputs are current inputs voltage control is possible by using external resistors. An on-chip RF oscillator is provided to reduce laser mode hopping noise during read mode. 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 switchoff is achieved by a ‘low’ at the ENABLE input. Rev. 4505H–DVD–11/05 Figure 1-1. Block Diagram I3 NE3 I2 NE2 IR NER ENABLE Channel 3 Channel 2 IOUT Read channel ENOSC RF oscillator RF RS 2 T0816 4505H–DVD–11/05 T0816 2. Pin Configuration Figure 2-1. Pinning SSO16 IR I2 GND RF I3 NER NE2 NE3 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC1 VCC2 IOUT GND RS ENABLE ENOSC VCC2 Table 2-1. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Description: SSOP16 Symbol IR I2 GND RF I3 NER NE2 NE3 VCC2 ENOSC ENABLE RS GND IOUT VCC2 VCC1 Type Analog Analog Supply 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 Ground External resistor to GND sets oscillator frequency Input current, bias voltage approximately GND Digital control of read channel (low active) Digital control of channel 2 (low active) Digital control of channel 3 (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 4505H–DVD–11/05 Figure 2-2. Pinning QFN16 NC RF I3 NER 1 2 3 4 16 15 14 13 12 11 10 9 5678 NE2 NE3 VCC2 ENOSC I2 IR VCC1 VCC2 IOUT IOUT RS ENABLE Table 2-2. Pin 1 2 3 4 5 6 7 8 9 10 11,12 13 14 15 16 Paddle Pin Description: QFN16 Symbol NC RF I3 NER NE2 NE3 VCC2 ENOSC ENABLE RS IOUT VCC2 VCC1 IR I2 GND Type – Analog Analog Digital Digital Digital Supply Digital Digital Analog Analog Supply Supply Analog Analog Supply Function Not connected External resistor to GND sets frequency of oscillator A Input current, bias voltage approximately GND Digital control of R channel (low active) Digital control of channel 2 (low active) Digital control of channel 3 (low active) +5V power supply for IOUT Enables RF oscillator (high active) Enables output current (high active) External resistor to GND sets oscillator swing Output current source for laser diode +5V power supply for IOUT +5V power supply for circuit Input current, bias voltage approximately GND Input current, bias voltage approximately GND Ground 4 T0816 4505H–DVD–11/05 T0816 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 Input voltage at NER, NE2, NE3, 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 + 2.0 –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 RF RS Tamb Value 4.5 to 5.5 < 2.5 < 1.0 3 >1 0 to +70 Unit V mA kΩ kΩ °C 5 4505H–DVD–11/05 6. Electrical Characteristics: General VCC = 5V, Tamb = 25°C, ENABLE = High, NER = Low, NE2 = NE3 = High, ENOSC = Low, unless otherwise specified No. 1 1.1 Parameters Power Supply Supply current, power down Supply current, read mode, oscillator disabled ENABLE = Low, NE2 = NE3 = Low IIR = 500 µA, II2 = 200 µA, II3 = 333 µA IIR = 500 µA, II2 = 200 µA, II3 = 333 µA, ENOSC = High, RS = 7.5 kΩ, RF = 7.5 kΩ IIR = 500 µA, II2 = 200 µA, II3 = 333 µA, NE2 = NE3 = Low IIR = II2 = II3 = 0 µA 9; 15; 16 9; 15; 16 ICCPD2 ICCR1 0.3 mA A Test Conditions Pin (1) Symbol Min. Typ. Max. Unit Type* 1.2 86 mA A 1.3 Supply current, read mode, oscillator enabled 9; 15; 16 ICCR2 90 mA A 1.4 Supply current, write mode Supply current, input off Digital Inputs NER/NE2/NE3 low voltage NER/NE2/NE3 high voltage ENABLE low voltage ENABLE high voltage ENOSC low voltage ENOSC high voltage 9; 15; 16 9; 15; 16 ICCW 175 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 Note: ICCoff 15 mA A 6, 7, 8 6, 7, 8 11 11 10 10 VNELO VNEHI VENLO VENHI VEOLO VEOHI 3.0 2.7 2.0 1.3 V V A A A A A A 0.5 0.5 V V V V Current at Digital Inputs NER/NE2/NE3 low current NER/NE2/NE3 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 1. Related to SSO16 package. 6 T0816 4505H–DVD–11/05 T0816 7. Electrical Characteristics: Laser Amplifier VCC = 5V, Tamb = 25°C, ENABLE = High, unless otherwise specified No. 4 4.1 4.2 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 Parameters Output IOUT Total output current Output current per channel IOUT series resistance Best fit current gain IR Best fit current gain I2 Best fit current gain I3 Best fit current offset Output current linearity IIN input impedance IIN input impedance IIN input impedance NE threshold Output off current 1 Output is sourcing Output is sourcing Total ROUT to VCC rail Channel R(1) Channel 2(1) Channel 3 (1) (1) Test Conditions Pin 14 14 14 14 14 14 14 14 1 2 5 6, 7, 8 14 Symbol IOUT IOUTR ROUT GAINR GAIN2 GAIN3 IOS ILIN RIN,IR RIN,I2 RIN,I3 VTH IOFF1 IOFF2 Min. 300 250 Typ. 350 Max. Unit mA mA Type* A A C A A A A A A A A B A 6 90 225 135 –8 –3 400 1000 600 500 1250 750 1.68 1 100 250 150 130 325 195 +4 +3 600 1500 900 Ω mA/mA mA/mA mA/mA mA % Ω Ω Ω V mA Any channel Any channel(1) RIN,IR is to GND RIN,I2 is to GND RIN,I3 is to GND Temperature stabilized ENABLE = Low NE2 = NE3 = High, IIR = 0, II2 = 200 µA, II3 = 333 µA NE2 = NE3 = Low, IIR = II2 = II3 = 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 4.16 Output off current 2 14 1 mA A 4.17 Output off current 3 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 IOFF3 VSER –4 5 mA A 4.18 14 1 %/V A 4.19 14 VSEW INOO TSER TSEW –6 0 %/V nA/ rt-Hz ppm/°C A 4.20 14 3 C 4.21 14 –400 C 4.22 14 –400 ppm/°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 7 4505H–DVD–11/05 8. Electrical Characteristics: Laser Current Amplifier Outputs 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 Output AC Performance Write rise time Write fall time Output current overshoot IOUT ON propagation delay IOUT OFF propagation delay IOUT = 40 mA (read) + 40 mA (10 to 90%)(1) IOUT = 40 mA (read) + 40 mA (10 to 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 RF = 7.5 kΩ ENOSC 50% HighLow to IOUT at 50% of final value ENOSC 50% LowHigh to IOUT at 50% of final value 14 14 14 tRISE tFALL OS 1.0 1.1 5 2.0 2.0 ns ns % C C C Test Conditions Pin Symbol Min. Typ. Max. Unit Type* 5.4 14 tON 2 ns C 5.5 14 tOFF 2 ns C 5.6 Disable time 14 tDIS 20 ns C 5.7 Enable time 14 tEN 20 ns C 5.8 6 6.1 6.2 Amplifier bandwidth Oscillator Oscillator frequency Osc. temperature coefficient Disable time oscillator 14 BWLCA 16 MHz C 14 14 FOSC TCOSC TDISO 270 300 –150 330 MHz ppm/°C A C 6.3 14 4 ns C 6.4 Enable time oscillator 14 TENO 2 ns C *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Note: 1. Load resistor at IOUT 6.8 Ω measurement with 50-Ω oscilloscope and 39-Ω series resistor. , 8 T0816 4505H–DVD–11/05 T0816 9. Characteristic Curves Figure 9-1. Oscillator Frequency versus Resistor RF (RS = 7.5 kΩ) 550.0 500.0 450.0 400.0 350.0 300.0 250.0 200.0 4.0 5.0 6.0 -10% Frequency (MHz) +10% RF(KΩ) 7.0 8.0 9.0 10.0 Figure 9-2. Oscillator Swing versus Resistor RS (RF = 7.5 kΩ) 120 100 Swing ( mA pk/pk ) 80 60 40 20 0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 RS ( kOhm ) Figure 9-3. Oscillator Frequency Dependency of Swing 60 50 Swing ( mA pk/pk ) 40 30 20 10 0 200.0 250.0 300.0 350.0 400.0 450.0 500.0 Frequency ( MHz ) 9 4505H–DVD–11/05 Figure 9-4. Transfer Characteristic of Channel 2 (Gain = 278, Load Resistor at IOUT = 6.8Ω) 400 350 300 y = 0.2783x - 3.3199 Vcc = 5.5 V Vcc = 5.0 V Vcc = 4.5 V IOUT (mA) 250 200 150 100 50 0 0 200 400 600 800 1000 1200 1400 1600 Iin (µA) Figure 9-5. Voltage Compliance R (IOUT to VCC) = 5.9Ω 350 300 250 IOUT ( mA ) 200 150 100 50 0 0.0 1.0 2.0 3.0 4.0 5.0 VCC-V(IOUT)/V 10 T0816 4505H–DVD–11/05 T0816 Figure 9-6. Step Response, Read Channel: 50 mA, Channel 2: 50 mApp Figure 9-7. Step Response, Read Channel: 50 mA, Channel 2: 250 mApp 11 4505H–DVD–11/05 Figure 9-8. Timing Diagram of IOUT ENABLE NER NE2 NE3 tON tON tEN tr tr tOFF tOFF tf tf t DIS Figure 9-9. Application Circuit A n a l o g __ D i g i t a l VCC IR I2 GND RF I3 NER NE2 NE3 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC1 VCC2 IOUT GND RS ENABLE ENOSC VCC2 LD VCC 12 T0816 4505H–DVD–11/05 T0816 10. Ordering Information Extended Type Number T0816-TCQ T0816M-TCQG T0816-PEQG Package SSO16 Pb-free SSO16 Pb-free QFN16 Remarks Taped and reeled Taped and reeled Taped and reeled 11. Package Information 13 4505H–DVD–11/05 14 T0816 4505H–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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