T0800 ATMEL | Alldatasheet

Document overview

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Technical content

Features

  • Current-controlled Output Current Source with 5 Input Channels
  • 2 Selectable Outputs for Grounded Laser Diodes
  • Output Current per Channel up to 200 mA
  • Total Output Current up to 250 mA
  • Rise Time 1.0 ns/Fall Time 1.1 ns
  • On-chip RF Oscillator
  • Control of 2 Different Frequencies and Swings by Use of 4 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 SSO24 Package and QFN28 Package

Applications

  • Combo Drives (DVD + CD-RW)
  • DVD-RAM with CD-RW Capability
  • DVD-RW with CD-RW Capability

Description

The T0800 is a laser diode driver for the operation of two different, grounded laser diodes for DVD-RAM (650 nm) and CD-RW (780 nm). It includes five channels for five different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level. The channels 2 to 5 are provided as write chan- nels with very fast switching speeds. When a low signal is applied to the NE pins, write current pulses are enabled. All channels are summed together and switched to one of the two outputs IOUTA or IOUTB by the select input SELA. Each channel can contrib- ute up to 200 mA to the total output current of up to 250 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 resis- tors. An on-chip RF oscillator reduces laser mode hopping noise during read mode. Frequency and swing can be set independently for the two selectable outputs with two pairs of resistors. Oscillation is enabled by a high signal at the ENOSC pin. Complete output current and oscillator switch-off is achieved by a low signal at the ENABLE input. 5-Channel Laser Driver with RF Oscillator and

2 Outputs

Rev. 4503D–DVD–02/05

4503D–DVD–02/05 T0800 Pin Configuration Figure 2-1. Pinning SSO24 IR RFA RFB NE2 NE3 NE4 NE5 ENABLE VCC1 VCC2 IOUTA IOUTA GND RSA RSB IOUTB IOUTB SELA ENOSC VCC2 Table 2-1. Pin Description: SSO24 Pin Symbol Type Function IR Analog Input current, bias voltage approximately GND Analog Input current, bias voltage approximately GND Analog Input current, bias voltage approximately GND Analog Input current, bias voltage approximately GND Analog Input current, bias voltage approximately GND RFA Analog External resistor to GND sets frequency of oscillator A RFB Analog External resistor to GND sets frequency of oscillator B NE2 Digital Digital control of channel 2 (low active) NE3 Digital Digital control of channel 3 (low active) NE4 Digital Digital control of channel 4 (low active) NE5 Digital Digital control of channel 5 (low active) ENABLE Digital Enables output current (high active) VCC2 Supply +5 V power supply for IOUT ENOSC Digital Enables RF oscillator (high active) SELA Digital High: selects IOUTA, RFA, RSA Low: selects IOUTB, RFB, RSB IOUTB Analog Output current source B for laser diode RSB Analog External resistor to GND sets swing of oscillator B RSA Analog External resistor to GND sets swing of oscillator A GND Supply Ground IOUTA Analog Output current source A for laser diode VCC2 Supply +5 V power supply for IOUT VCC1 Supply +5 V power supply for circuit

4503D–DVD–02/05 T0800 Figure 2-2. Pinning QFN28 RFA RFB GND NE2 NE3 IOUTA IOUTA GND RSA RSB IOUTB IOUTB IR NC VCC1 VCC2 VCC2 NE4 NE5 ENABLE VCC2 VCC2 ENOSC SELA 28 27 26 25 24 23 22 8 9 10 11 12 13 14 Table 2-2. Pin Description: QFN28 Pin Symbol Type Function Analog Input current, bias voltage approximately GND Analog Input current, bias voltage approximately GND RFA Analog External resistor to GND sets frequency of oscillator A RFB Analog External resistor to GND sets frequency of oscillator B GND Supply Ground NE2 Digital Digital control of channel 2 (low active) NE3 Digital Digital control of channel 3 (low active) NE4 Digital Digital control of channel 4 (low active) NE5 Digital Digital control of channel 5 (low active) ENABLE Digital Enables output current (high active) 11, 12 VCC2 Supply +5 V power supply IOUT ENOSC Digital Enables RF oscillator (high active) SELA Digital High: selects IOUTA, RFA, RSA Low: selects IOUTB, RFB, RSB IOUTB Analog Output current source B for laser diode IOUTB Analog Output current source B for laser diode RSB Analog External resistor to GND sets swing of oscillator B RSA Analog External resistor to GND sets swing of oscillator A GND Supply Ground IOUTA Analog Output current source A for laser diode IOUTA Analog Output current source A for laser diode 22, 23 VCC2 Supply +5 V power supply IOUT VCC1 Supply +5 V power supply circuit NC Not connected IR Analog Input current, bias voltage approximately GND Analog Input current, bias voltage approximately GND Analog Input current, bias voltage approximately GND Paddle Should be connected with ground

4503D–DVD–02/05 T0800 Figure 2-3. Block Diagram Channel 3 Channel 2 NE3 NE2 Read channel RF oscillator IR ENOSC ENABLE RFA RSA Channel 4 Channel 5 NE4 NE5 IOUTA IOUTB RFB RSB SELA

4503D–DVD–02/05 T0800 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. Parameter Symbol Value Unit Supply voltage VCC -0.5 to +6.0 V Input voltage at IR, I2, I3, I4, I5 VIN1 -0.5 to +0.5 V Input voltage at NE2, NE3, NE4, NE5, ENOSC VIN2 -0.5 to VCC +0.5 V Output voltage VOUT -0.5 to VCC -1 V Power dissipation Ptot 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 Parameter Symbol Value(1) Unit Junction ambient RthJA 115 (SSO24) 35 (QFN28) K/W K/W Note: 1. Measured with multi-layer test board (JEDEC standard JESD51-7) Recommended Operating Conditions Parameter Symbol Value Unit Supply voltage range VCC 4.5 to 5.5 V Input current IIR, II2, II3, II4, II5 < 2.5 mA External resistor to GND to set oscillator frequency RFA, RFB > 3 kΩ External resistor to GND to set oscillator swing RSA, RSB > 100 Ω Operating temperature range Tamb 0 to +70

4503D–DVD–02/05 T0800

Electrical Characteristics

VCC = 5 V, Tamb = 25°C, ENABLE = High, NE2 = NE3 = NE4 = NE5 = High, ENOSC = Low, unless otherwise specified No. Parameters Test Conditions Pin(1) Symbol Min. Typ. Max. Unit Type* Power Supply 1.1 Supply current, power down ENABLE = Low, NE2 = NE3 = NE4 = NE5 = Low 11,12, 22, 23, 24 ICCPD2 0.5 mA A 1.2 Supply current, read mode, oscillator disabled IIR = II2 = II3 = II4 = II5 = 500 µA 11,12, 22, 23, 24 ICCR1 115 mA A 1.3 Supply current, read mode, oscillator enabled, output A selected IIR = II2 = II3 = II4 = II5 = 500 µA, ENOSC = High, RS = 560 Ω, RF = 7.5 kΩ, SELA = High 11,12, 22, 23, 24 ICCR2 120 mA A 1.4 Supply current, write mode IIR = II2 = II3 = II4 = II5 = 500 µA, NE2 = NE3 = NE4 = NE5 = Low 11,12, 22, 23, 24 ICCW 320 mA A 1.5 Supply current, input off IIR = II2 = II3 = II4 = II5 = 0 µA 11,12, 22, 23, 24 ICCoff mA A Digital Inputs 2.1 NE2/NE3/NE4/NE5 low voltage 6, 7, 8, 9 VNELO 1.1 V A 2.2 NE2/NE3/NE4/NE5 high voltage 6, 7, 8, 9 VNEHI 2.0 V A 2.3 SELA low voltage VSELALO 0.5 V A 2.4 SELA high voltage VSELAHI 2.0 V A 2.5 ENABLE low voltage VENLO 0.5 V A 2.6 ENABLE high voltage VENHI 2.0 V A 2.7 ENOSC low voltage VEOLO 0.5 V A 2.8 ENOSC high voltage VEOHI 2.0 V A Currents at Digital Inputs 3.1 NE2/NE3/NE4/NE5 low current NE = 0 V 6, 7, 8, 9 INELO -300 µA A 3.2 NE2/NE3/NE4/NE5 high current NE = 5 V 6, 7, 8, 9 INEHI 800 µA A 3.3 SELA low current SELA = 0 V ISELALO -45 µA A 3.4 SELA high current SELA = 5 V ISELAHI 150 µA A 3.5 ENABLE low current ENABLE = 0 V IENLO -150 µA A 3.6 ENABLE high current ENABLE = 5 V IENHI 100 µA A 3.7 ENOSC low current ENOSC = 0 V IEOLO -100 µA A 3.8 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 Note: 1. Related to QFN28 Package

4503D–DVD–02/05 T0800 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* Outputs IOUTA and IOUTB 4.1 Best fit current gain Any channel(1) 15, 16, 20, 21 GAIN 100 130 mA/mA A 4.2 Best fit current offset Any channel(1) 15, 16, 20, 21 IOS mA A 4.3 Output current linearity Any channel(1) 15, 16, 20, 21 ILIN A 4.5 Output current per channel Output is sourcing 15, 16, 20, 21 IOUTR 200 mA A 4.6 Total output current 15, 16, 20, 21 IOUT 250 mA A 4.7 IIN input impedance RIN is to GND 1, 2, 26, 27, 28 RIN 170 220 270 Ω A 4.8 NE threshold Temperature stabilized 6, 7, 8, VTH 1.68 V C 4.9 Output off current 1 ENABLE = Low 15, 16, 20, 21 IOFF1 mA A 4.10 Output off current 2 NE2 = NE3 = NE4 = NE5 = High 15, 16, 20, 21 IOFF2 mA A 4.11 Output off current 3 NE2 = NE3 = NE4 = NE5 = Low, IIR = II2 = II3 = II4 = II5 = 0 µA 15, 16, 20, 21 IOFF3 mA A 4.12 IOUT supply sensitivity, read mode IOUT = 40 mA, VCC = 5 V ±10%, read-only 15, 16, 20, 21 VSER A 4.13 IOUT supply sensitivity, write mode IOUT = 80 mA, 40 mA read + 40 mA write, VCC = 5 V ±10% 15, 16, 20, 21 VSEW A 4.14 IOUT current output noise IOUT = 40 mA, ENOSC = Low 15, 16, 20, 21 INOO nA/ rt-Hz C 4.15 IOUT temperature sensitivity, read mode IOUT = 40 mA, read only 15, 16, 20, 21 TSER -100 ppm/°C C 4.16 IOUT temperature sensitivity, write mode IOUT = 80 mA, 40 mA read + 40 mA write 15, 16, 20, 21 TSEW -300 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

4503D–DVD–02/05 T0800 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* Outputs IOUTA and IOUTB, AC Performance 5.1 Write rise time IOUT = 40 mA (read) 15, 16, 20, 21 tRISE 1.0 3.0 ns C 5.2 Write fall time IOUT = 40 mA (read) 15, 16, 20, 21 tFALL 1.1 3.0 ns C 5.3 Output current overshoot IOUT = 40 mA (read) + 40 mA(1) 15, 16, 20, 21 OS C 5.4 IOUT ON prop delay NE 50% High-Low to IOUT at 50% of final value 15, 16, 20, 21 tON 2.0 ns C 5.5 IOFF OFF prop delay NE 50% Low-High to IOUT at 50% of final value 15, 16, 20, 21 tOFF 2.0 ns C 5.6 Disable time ENABLE 50% High-Low to IOUT at 50% of final value 15, 16, 20, 21 tDIS ns C 5.7 Enable time ENABLE 50% Low-High to IOUT at 50% of final value 15, 16, 20, 21 tEN ns C 5.8 Disable time oscillator ENOSC 50% Low-High to IOUT at 50% of final value 15, 16, 20, 21 TDISO ns C 5.9 Enable time oscillator ENOSC 50% High-Low to IOUT at 50% of final value 15, 16, 20, 21 TENO ns C 5.10 SELA delay SELA Low-High 50% to IOUT at 50% of final value 15, 16, 20, 21 TSAH TBD ns C 5.11 SELA delay SELA High-Low 50% to IOUT at 50% of final value 15, 16, 20, 21 TSAL TBD ns C 5.12 Amplifier bandwidth IOUT = 50 mA, all channels, -3 dB value 15, 16, 20, 21 BWLCA MHz C Oscillator 6.1 Oscillator frequency RF = 4.7 kΩ 15, 16, 20, 21 FOSC 380 470 560 MHz A 6.2 Oscillator temperature coefficient RF = 4.7 kΩ 15, 16, 20, 21 TCOSC -150 ppm/°C C 6.3 Disable time oscillator ENOSC 50% High-Low to IOUT, at 10%/90% of final value 15, 16, 20, 21 TDISO ns C 6.4 Enable time oscillator ENOSC 50% Low-High to IOUT, at 10%/90% of final value 15, 16, 20, 21 TENO ns C *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

4503D–DVD–02/05 T0800 11. Package Information 10. Ordering Information Extended Type Number Package Remarks T0800-TNQ SSO24 Taped and reeled T0800-PJQ QFN28 Taped and reeled technical drawings according to DIN specifications Dimensions in mm 8.05 7.80 0.15 0.05 0.25 0.65 7.15 1.30 5.7 5.3 4.5 4.3 6.6 6.3 0.15

4503D–DVD–02/05 T0800

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