T0820 ATMEL | Alldatasheet

Document overview

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Technical content

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 5 V Power Supply
  • Common Enable/Disable Input
  • TTL/CMOS Control Signals
  • Small SSO16 Package Application
  • DVD-RAM
  • DVD-RW
  • DVD+RW
  • CD-RW
  • Writable Optical Drives

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. Com- plete output current and oscillator switch-off is achieved by a \`low' at the ENABLE input. Figure 1. Block Diagram

Figure 2. Pinning SSO16

4506F–DVD–09/04 Absolute Maximum Ratings 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 Junction temperature Tj 150 Storage temperature range Tstg -65 to +125 Notes: 1. RthJA ≤ 115 k/W, Tamb = 70°C 2. RthJA ≤ 115 k/W, Tamb = 25°C Thermal Resistance Parameters Symbol Value Unit Junction ambient RthJA 115(1) K/W Note: 1. Measured with multi-layer test board (JEDEC standard) Operating Range Parameters Symbol Value Unit Supply voltage range VCC 4.5 to 5.5 V Input current IIR, II2, II3, II4 mA External resistor to GND to set oscillator frequency RF kΩ External resistor to GND to set oscillator swing RS >100 Ω Operating temperature range Tamb 0 to +70 ° C

4506F–DVD–09/04 Electrical Characteristics: General VCC = 5 V, Tamb = 25°C, ENABLE = High, NE2 = NE3 = NE4 = High, ENOSC = Low, unless otherwise specified No. 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, ICCPD2 0.3 mA A 1.2 Supply current, read mode, oscillator disabled IIR = II2 = II3 = II4 = 500 µA 9, 15, ICCR1 mA A 1.3 Supply current, read mode, oscillator enabled IIR = II2 = II3 = II4 = 500 µA, ENOSC = High, RS = 560 Ω, RF = 7.5 kΩ 9, 15, ICCR2 100 mA A 1.4 Supply current, write mode IIR = II2 = II3 = II4= 500 µA, NE2 = NE3 = NE4 = Low 9, 15, ICCW 230 mA A 1.5 Supply current, input off IIR = II2 = II3 = II4 = 0 µA 9, 15, ICCoff mA A Digital inputs 2.1 NE2/NE3/NE4 low voltage 6, 7, 8 VNELO 1.3 V A 2.2 NE2/NE3/NE4 high voltage 6, 7, 8 VNEHI 2.0 V A 2.3 ENABLE low voltage VENLO 0.5 V A 2.4 ENABLE high voltage VENHI 3.0 V A 2.5 ENOSC low voltage VEOLO 0.5 V A 2.6 ENOSC high voltage VEOHI 3.0 V A Current at digital inputs 3.1 NE2/NE3/NE4 low current NE = 0 V 6, 7, 8 INELO -300 µA A 3.2 NE2/NE3/NE4 high current NE = 5 V 6, 7, 8 INEHI 800 µA A 3.3 ENABLE low current ENABLE = 0 V IENLO -150 µA A 3.4 ENABLE high current ENABLE = 5 V IENHI 100 µA A 3.5 ENOSC low current ENOSC = 0 V IEOLO -100 µA A 3.6 ENOSC high current ENOSC = 5 V IEOHI 800 µA A * Type means: A: 100% tested B: 100% correlation tested C: Characterized on samples D: Design parameter

4506F–DVD–09/04 Electrical Characteristics: Laser Amplifier VCC = 5 V, Tamb = 25°C, ENABLE = High, unless otherwise specified No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Laser Amplifier 4.1 Best fit current gain Any channel(1) GAIN 105 130 mA/mA A 4.2 Best fit current offset Any channel(1) IOS mA A 4.3 Output current linearity Any channel(1) ILIN A 4.4 Input current range Input is sinking 1, 2, 4, 5 IDAC mA C 4.5 Output current read channel Output is sourcing IOUTR 150 mA A 4.6 Output current channel 2 Output is sourcing IOUT2 150 mA A 4.7 Output current channel 3 Output is sourcing IOUT3 200 mA A 4.8 Output current channel 4 Output is sourcing IOUT4 200 mA A 4.9 Output current read channel + channel 2 Output is sourcing IOUTR,2 150 mA A 4.10 Output current channel 3 + channel 4 Output is sourcing IOUT3,4 200 mA A 4.11 Total output current Output is sourcing IOUT 300 mA A 4.12 IOUT series resistor IOUT = 250 mA total ROUT to VCC-Rail ROUT Ω C 4.13 IIN input impedance RIN is to GND 1, 2, 4, 5 RIN 150 200 250 Ω A 4.14 NE threshold Temperature stabilized 6, 7, 8 VTH 1.68 V B 4.15 Output off current 1 ENABLE = Low IOFF1 mA A 4.16 Output off current 2 NE2=NE3=NE4=High IIR=0 µA, II2=II3=II4= 500 µA IOFF2 mA A 4.17 Output off current 3 NE2=NE3=NE4=Low, IIR=II2=II3=II4= 0 µA IOFF3 mA A 4.18 IOUT supply sensitivity, read mode IOUT = 40 mA, VCC = 5 V ± 10%, read only VSER %/V A 4.19 IOUT supply sensitivity, write mode IOUT = 80 mA, 40 mA read + 40 mA write, VCC=5V±10% VSEW 0.2 %/V A 4.20 IOUT current output noise IOUT = 40 mA, ENOSC = Low INOO nA/ rt-Hz C 4.21 IOUT temperature sensitivity, read mode IOUT = 40 mA, read only TSER -500 ppm/ C 4.22 IOUT temperature sensitivity, write mode IOUT = 80 mA, 40 mA read + 40 mA Write TSEW -600 ppm/ 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

4506F–DVD–09/04 Electrical Characteristics: Laser Current Amplifier Output AC Performance VCC = +5 V, IOUT = 40 mA DC with 40 mA pulse, Tamb = 25°C, unless otherwise specified No. 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) + tRISE 1.0 3.0 ns C 5.2 Write fall time IOUT = 40 mA (read) + tFALL 1.1 3.0 ns C 5.3 Output current overshoot IOUT = 40 mA (read) + 40 mA (1) OS C 5.4 IOUT ON prop delay NE 50% High-Low to IOUT at 50% of final value tON 2.0 ns C 5.5 IOUT OFF prop delay NE 50% Low-High to IOUT at 50% of final value tOFF 2.0 ns C 5.6 Disable time ENABLE 50% High- Low to IOUT at 50% of final value tDIS ns C 5.7 Enable time ENABLE 50% Low- High to IOUT at 50% of final value tEN ns C 5.10 Amplifier bandwidth IOUT = 50 mA, all channels, -3 dB value BWLCA MHz C Oscillator 6.1 Oscillator frequency RF = 7.5 kΩ RS = 560 Ω FOSC 255 300 350 MHz A 6.2 Oscillator temperature coefficient RF = 7.5 kΩ RS = 560 Ω TCOSC -150 ppm/ C 6.3 Disable time oscillator ENOSC 50% Low- High to IOUT at 50% of final value TDISO ns C 6.4 Enable time oscillator ENOSC 50% High- Low to IOUT at 50% of final value TENO ns C 6.5 Oscillator swing RF = 7.5 kΩ RS = 560 Ω SOSC mApp A *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Note: 1. Load resistor at IOUT 10 Ω, measurement with a 50-Ω oscilloscope and a 39-Ω series resistor

4506F–DVD–09/04

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